dr1k

Corporate Engineering Standard Design Standard DR1K

reg Process Control Technology Network ndash Instruments

DR1K

Heat Tracing for Instrument Installations Table of Contents

1 Scope 2 2 Reference Standards and specifications 2 3 General 2 4 Heating medium selection 3 5 Safety considerations 4 6 Heat tracing materials 5

61 Steam systems 5 62 Electric systems 7 63 Instrument enclosures 9

7 Steam tracing design procedure 9 71 Freeze protection 9 72 Maintaining a constant elevated

temperature 10 8 Electrical tracing design procedure 12

82 Freeze protection 12 83 Maintaining a constant elevated

temperature 12 9 Equipment manufacturers 13 List of Figures Figure 1 Typical steam-tracing system for

freeze protection 21 Figure 2 Typical steam-tracing system for

constant temperature control 22 Figure 3 Typical electrical-tracing system for

freeze protection 23 Figure 4 Typical electrical-tracing system for

constant temperature control 24 Figure 5 Prefabricated steam traced tubing

bundles 25 Figure 6 Prefabricated electrically heated

tubing bundles 26 Figure 7 Prefabricated electrically heated

tubing bundles 26

Figure 8 Process tube temperature versus distance from steam inlet for 30 and 80 psig steam and various ambient temperatures 26

Figure 8 Process tube temperature versus distance from steam inlet for 30 and 80 psig steam and various ambient temperatures 27

Figure 9 Average heat loss versus ambient temperature for various inlet steam pressures28

Figure 10 Tracer length versus heat loss 29 List of Tables Table 1 Wind chill effect 14 Table 2 Comparative methods and estimated

installed cost ratios for new project workmdashdifferential pressure transmitter installation14

Table 3 Temperature (degF) maintained inside insulated lines fiberglass tape Code 99214

Table 4 Heat loss (Btuhbullft) from insulated lines fiberglass tape Code 992 15

Table 5 Temperature (degF) maintained inside insulated lines calcium silicate Code 102 or 1021 16

Table 6 Heat loss (Btuhbullft) from insulated lines calcium silicate Code 102 or 102117

Table 7 Temperature (degF) maintained inside insulated lines glass fiber Code 11218

Table 8 Heat loss (Btuhmiddotft) from insulated lines glass fiber Code 112 19

Table 9 Size factors to determine maximum length of steam tracer20

Red text indicates revisions made in the August 2009 issue

Document revised August 2009 Entire document reaffirmed August 2009 Contact ValerieSLamisonusadupontcom by e-mail for more information This document may be used and reproduced for DuPont business only

Copyright copy 2001 2009 EI du Pont de Nemours and Company All Rights Reserved (Unpublished)(Engineering) of 29

DR1K Heat Tracing for Instrument Installations reg

1 Scope This Standard presents design and application information for use in providing heat tracing for instrumentation Both steam and electrical tracing systems are considered

2 Reference Standards and specifications Web access to the following standards is provided from this section only R240K Electrical Instruments Connected to Flammable Process Materials K11C Steam Tracing H6P Winter Outdoor Temperature Conditions for Process and Comfort Air Conditioning

Design P6B Steam Traps and Strainers DE1H Electrical Pipeline Heat Tracing Design and Application DE5H Power Control Devices in Electrical Heating and Other Variable Power Applications DE6H Temperature Control of Electrical Heating for Pipelines and Snow Melting DE1Q Emergency and Standby Power Systems DG86C Heat Losses from Bare and Insulated Surfaces SE323B Electrical Heat-Tracing Cable Strips and Tapes SE404B Thermostats for Pipeline and Vessel Heating Circuits SN305A Insulation Systems for Instrument Piping and Tubing Minus 100degF to Plus 1200degF SN100M Code Specification for Preformed Block and Pipe Insulation SN500M Fluid and Plastic Insulation SN900M Fasteners and Miscellaneous The National Electrical Code (NEC)

3 General 31 Heating must be provided for instrument systems containing process fluids where either of the following needs exists

311 It is necessary to protect against freeze-up when ambient temperatures are below the freeze point of the process material This condition may exist only seasonally during cold weather or may exist continuously where materials with elevated freeze points are involved

312 The process fluid must be controlled at an elevated temperature to avoid phase change or to satisfy an instrument operating requirement as would be the case with analyzer sample piping

32 The methods for winterizing instrumentation vary with the minimum temperature to be expected the maximum number of consecutive hours that subfreezing temperatures can be expected to exist and the process material involved

The National Electrical Code (NEC) on which Subparts of OSHA regulations CFR 1910 is based may not be the latest edition However it is DuPont practice to use for reference the current edition of consensus Standards This Standard meets or exceeds the requirements of the NEC

Document revised August 2009 Entire document reaffirmed August 2009

Copyright copy 2001 2009 EI du Pont de Nemours and Company All Rights Reserved Used under Copyright License Page 2 of 29


33 Refer to H6P for outdoor winter temperatures at DuPont plant locations Wind-chill effect is shown in Table 1 The temperature determined from this table is the calm ambient temperature that will cause the same rate of heat loss as the temperature and wind condition chosen for the design basis Tables 3 through 8 and Figures 8 and 9 are based upon calm wind conditions The temperature from Table 1 is to be used to determine the heat loss rate from an insulated line and the temperature maintained by a tracing system from those tables and figures

34 Lines containing low-viscosity fluids with pour points below the minimum expected ambient temperature need not be freeze protected

35 Lines containing liquids with freeze points above the minimum expected ambient temperature or vapors or gases containing water vapor or other condensables which will condense at the minimum expected ambient temperature must be protected by heating and thermal insulation

36 When steam is used as the heat source tracing may be designed as either heavy or light Heavy tracing is provided by designing the tracer in direct contact with the line to be heated Light tracing is achieved by insulating or otherwise separating the tracer from direct contact with the line to be heated See 6164 for approved methods and Figure 5 for cross sections of typical pretraced tubing assemblies Light tracing should be provided when the fluid in an instrument line is thermally sensitive or has a boiling point below the tracing steam condensing temperature

37 Where heat tracing is applied to a critical measurement or control an alarm system to indicate tracing system failure should be included in the design Refer to DX8S

38 When multiple preassembled traced tube assemblies are routed together trapeze hangers and spacing of at least 1-12 inches between assemblies is recommended If assemblies are routed horizontally with other assemblies routed above or below a 6-inch spacing should be allowed between the horizontal assemblies When using instrument trays for support the trays must be of the perforated type for ventilation and above spacing observed This spacing will reduce the PVC jacket deterioration due to heat buildup and greatly extend the useful life of the assemblies

4 Heating medium selection 41 Heating for instrumentation can be accomplished with either electrical or steam tracing

42 Until recently most heating for instrumentation systems has been provided by steam tracing but recent developments in electrical heating cable designs have made this medium a more efficient reliable and precise heating means

43 Electrical heating is preferable to steam where the temperature must be accurately controlled or limited On-off or throttling temperature control using steam is usually not practical due to water logging of tracer sections or supply piping freezing problems and temperature gradients along the heated line

44 Electrical heating is usually the best choice for instrumentation located at remote points The costs to install steam supply and condensate return piping makes steam a poor economic choice for these applications

45 Electrical heating is the better choice where the process materials involved degrade when overheated or where plastic or elastomeric elements in the instrumentation system impose strict temperature limits




46 For seasonal freeze protection it is desirable to have the tracer temperature equivalent to the desired minimum temperature of the protected line In most cases this temperature lies in the normal ambient range Since steam temperatures below 212degF (100degC) are impractical use of steam for these applications is wasteful of energy and should only be considered where ample waste steam is available at 50 psig or less

47 Electrical heating systems using either preassembled traced tube assemblies or field-assembled tubing tracing and insulation cost less to install than steam systems of either type See Table 2 for relative installed cost ratios

48 Elimination of steam traps strainers hand valves pipe fittings and condensate recovery systems gives electrical heating a decided maintenance cost advantage

49 Use of steam for heating eliminates the hazards of electrical equipment in areas handling flammable materials However where steam supply temperature exceeds 80 percent of the ignition temperature in degrees Celsius of the most flammable atmospheric mixture of the hazardous material involved special attention shall be given to the thermal insulation and its exterior treatment to ensure no exposed surfaces exceed this temperature and that no points exist for intrusion of the flammable material into the insulation

410 Where surplus low-pressure steam is readily available to satisfy the instrumentation heating requirements and condensate recovery facilities can be easily provided steam heating may be the best economic choice

411 The use of 15-psig steam for heat tracing should be avoided unless the condensate is to be trapped to atmosphere This pressure is too low for reliable trap operation against the back-pressure of a closed condensate recovery system

5 Safety considerations 51 Electrical installations must meet the requirements of the National Electrical Code and the Occupational Safety and Health Administration (OSHA) as defined in 29 CFR Part 1910 for US installations Installations in other countries shall comply with the specific country and local code electrical requirements Electrical heating elements shall conform to the applicable area electrical classification requirements

52 All electrical tracer cable shall have a continuous protective metal sheath wire braid or cover which is connected to ground Wire braid used for this purpose is to be tinned copper to provide easy handling and acceptable fault-current capacity The cable construction may include an extruded plastic sheath over this braid for protection from environmental corrosion Use of ground fault circuit interrupters as the power switch and overload device is recommended to minimize the possibility of fire resulting from a cable insulation failure Refer to DE6H 73 for guidance in applying these devices

53 A means shall be provided to permit isolating the power from each electrical tracer This means shall permit locking the circuit open during maintenance operations It may be a circuit breaker or fusible switch in an individual housing or group enclosure suitable for the area electrical classification

54 Additional required safety features for electrically heated installations can be found in Section 4 of DE1H




55 All electrically heated instrument lines shall be marked or properly tagged in a conspicuous manner at not greater than 10-foot intervals to warn against the danger of sawing into energized cables when removing the thermal insulation

56 Steam traps are to be located to provide safe and convenient maintenance access Where traps and associated piping must be left uninsulated appropriate guards are to be provided for personnel protection

57 Discharges from strainer blowdown and trap test valves are to be directed away from normal walkways and stairways and designed so they present no hazard to nearby personnel when in operation

58 Where condensate must be trapped to the atmosphere suitable means for collecting and draining the condensate shall be provided Such facilities shall be designed to operate properly during the coldest expected ambient conditions to avoid having a slipping hazard created by ice formed from backed up condensate

59 Low flow andor high temperature interlocks to shut off the source of heat must be provided if overheating will cause the process material involved to deflagrate or detonate

6 Heat tracing materials

61 Steam systems

611 The major components of a typical steam-tracing system are shown in diagram on Figure 1

612 Steam supply piping up to the tracer supply manifold and the condensate return header are to meet requirements of the applicable pipe code

613 Factory-preinsulated tubing complete with extruded PVC watertight exterior finish is the economical choice for individual tracer supply piping from the shutoff valve at the tracer supply manifold to where the tracer enters the insulation around the instrument lines being heated

614 Steam heating freeze protection cost can be reduced by using the steam only as needed Accepted practice is to turn the steam On as the ambient temperature drops to be 4degF (2degC) above the process freezing point and Off when the temperature rises to 11degF (6degC) above freezing It is advisable to use automatic devices to do this

6141 Self-contained ambient temperature-sensing regulating valves such as the Ogontz Type TL and Jordan Mark 86 are suitable for controlling steam to a single tracer or a small group of tracers

6142 Where the tracing load justifies a snap-acting control system made up of standard electric or pneumatic instrumentation and control valves may be used to control the steam to all instrument freeze protection heating in a process area

6143 Where Ogontz or Jordan valves are used a strainer shall be provided to keep scale from interfering with valve performance

6144 Sensing elements for these controls should be located so as to provide protection from physical damage in an area where the temperature is representative




of the general ambient Protection from radiant heat and direct contact with steam leakage heated air or vapors must be provided

615 The tracer is the tubing which carries the steam for heating and is attached to instrument tubing piping and instrumentation containing the process material to be heated

6151 Prefabricated traced insulated and PVC jacketed tubing assemblies offer the best installation economics These are available with one or two process-fluid-containing tube constructions a tracer and insulation designs to provide light or heavy tracing Figure 5 shows typical cross sections for the various bundle assemblies available for steam tracing Figures 8 and 9 show typical design data for these packages When use of these assemblies is planned information should be obtained from the specific vendor under consideration

6152 Tracer tubing used on field-fabricated installations shall be copper per Corporate Pipe Code T2G408 or applicable plant or project pipe code for steam at the proposed pressure Copper tubing shall not be used where the tracer temperature will exceed 400degF (204degC)

6153 Where ambient conditions or tracing temperature require it stainless steel Monel E-Brite or other high strength corrosion-resistant alloy tubing shall be selected per the appropriate plant or project pipe code

6154 Aluminum tubing is not recommended for steam-tracing systems

6155 A minimum tubing size of 38 inch is recommended for installations where the ambient temperature can be expected to be 0degF (ndash18degC) or lower

616 If prefabricated traced-tubing assemblies are not used the steam tracer must be held in position to maintain contact with the line being traced except as noted in 6174 This may be done with tape metal strapping or wire

6161 The preferred method for fastening the tracer in place is to use a glass fiber adhesive tape meeting the requirements of SN900M Code 969 The adhesive on this tape does not contain chlorides or other halides and may be used with austenitic stainless steel This tape should not be used where temperatures exceeding 500degF (260degC) will occur

6162 Use of metal bands or straps spaced at approximately 4-foot intervals is an alternate method of holding the tracer in place Bands used in this application shall meet the requirements of SN900M Code 926

6163 The tracer may also be held in place by metal wire Wiring used in this service may be Type 430 soft annealed stainless steel per SN900M Code 921 or 922 Because the wire wrap can pull the tracer into contact with the heated line at a point between spacers this method is not recommended where spacers are used

6164 If the process fluid in the instrument line is temperature sensitive or has a boiling point lower than the tracing steam temperature the tracer must be insulated from the line to prevent local hot spots from occurring This requirement is easily met by selecting one of the preassembled traced-tube assemblies designed for light tracing shown on Figure 5 It may be accomplished in field-assembled systems by laying a continuous 18-inch thickness of glass tape SN900M Code 992 between




the heated line and the tracer before fixing the tracer in place with the attaching means Refer to K11C for design considerations when use of this method is planned

617 Steam traps should be located below and close to the end of the tracer They should be easily accessible for inspection and maintenance A separate trap shall be provided for each tracer Traps for instrumentation heating systems shall be selected according to P6B Condensate should be immediately removed by the trap and not be allowed to cool as this practice can result in serious corrosion due to carbonic acid or plugging (or both) caused by the dropout of corrosion products

618 Each trap shall be protected from dirt scale and other contaminants by a line size strainer located immediately upstream Strainers selected for instrumentation heating systems shall meet the requirements of P6B

619 SN305A shall be used to guide the selection of thermal insulation and associated moisture barrier finish for these tracing systems

6110 When steam tracing or jacketing is used to control process material in an instrument line at a specific temperature the ambient temperature-sensing control valve shown on Figure 1 is replaced by an automatic temperature-control system designed to maintain the process fluid temperature entering the final instrument device at a preset value See Figure 2

61101 Temperature-control equipment for these applications should match that used for process temperature controls at the site

61102 The steam throttling valve shall be located at the high point of the steam supply to the tracer to minimize temperature gradients along the tracer by ensuring that it is charged with steam throughout its length and avoid condensate accumulation in the supply piping to the valve during periods of very low steam usage See Figure 2

61103 The traced or jacketed line should be designed with a downward slope from the point of steam supply to the trap

62 Electric systems

621 Electric power supply reliability should be considered as part of tracing system design to ensure against loss of heating on normal supply failures or power interruptions for plant equipment maintenance Where the need for reliable heating is sufficiently critical automatic switching equipment or a standby generator (see DE1Q) may be justified

6211 For those constant temperature-control applications where higher cable sheath temperatures are required mineral-insulated (Type MI) metal-sheathed tracing cable is recommended With a stainless steel sheath this cable may be used at a maximum sheath temperature of 800degF (427degC) This type of cable provides inherently better mechanical protection for the heating element than the others and is recommended where such protection is required Type MI cable is more difficult to work with than either of the other types due to its inherent lower flexibility the reduced maximum allowable length for the same supply voltage and the use of special fittings in its makeup Type MI cable is approved for use in hazardous areas classified in Class I Divisions 1 and 2 Groups B C and D Class II Division 1 Groups E and G Class II Division 2 Group G and Class III Divisions 1 and 2




6212 Where electrical tracing is used in areas defined as hazardous by the National Electrical Code cable sheath temperature must be restricted to a temperature that is not more than 80 percent of the ignition temperature in degrees Celsius of the most flammable atmospheric mixture of the material present See DE1H section 5 for additional safety requirements and a relationship for determining sheath temperature from the design parameters

622 Prefabricated electrically traced insulated and PVC jacketed tubing assemblies are available with one or two process fluid containing tube constructions See Figures 6 and 7

6221 These assemblies are available with heating provided by constant power density cable or self-limiting cable

6222 Assemblies using self-limiting cable may be obtained with either low- or high-wattage heating cable to suit the application

6223 Prefabricated assemblies with electrical heating cables offer the lowest cost means of providing instrumentation freeze protection See Table 2 for relative installed cost factors When use of these assemblies is planned design information should be obtained from the specific vendor under consideration Some vendors will provide completely engineered heat tracing packages including design installation drawings materials electrical distribution and alarm panels with installation if requested

6224 These factory-assembled packages are available with ratings for use in hazardous areas classified as Class I Division 2 Groups B C and D and Class II Division 2 Group G

623 If prefabricated tubing assemblies are not used the heating cable must be held in contact with the line to be heated by fastening it in place at intervals not to exceed 1 foot Glass fiber adhesive tape meeting the requirements of SN900M Code 969 is the preferred method for fastening electrical cables Metal bands and wires shall not be used for this function as they may damage the cablersquos insulation except where Type MI cable is used

624 SN305A is to be used to guide the selection of thermal insulation and exterior moisture-barrier finish for these systems when the tracer is field assembled to the instrument piping Use of calcium silicate and glass fiber insulations with electrical cables is discouraged because they have such poor moisture resistance Rigid polyisocyanurate foam Code 1181 is recommended

625 Electrical heating can be used to closely control the temperature of process material in an instrument line The quick response of the heating elements to the controllerrsquos action and the high sensitivity of electronic temperature sensors permit closer control than can be realized with steam

6251 DE6H should be used to guide the selection of the type of control to be used choice of sensor device and means for monitoring electrical tracer operation

6252 Guidance can be found in DE5H for the selection of suitable methods and devices to control electrical heating loads Magnetic contactors silicon-controlled rectifiers and saturable core reactors are reviewed and their relative advantages and disadvantages identified




6253 Thermostats for use in electrical heating controls are identified in SE404B along with their temperature ranges and control differentials Devices for general purpose and hazardous areas are included

63 Instrument enclosures

631 Instrument enclosures are housing covering all or part of an instrument case and may be used to provide weather and freeze protection The features to be considered when selecting an enclosure are

a Working space and access The space inside the enclosure and around the instrument case should be adequate for routine maintenance and for instrument removal Properly sized and positioned access doors are necessary and observation windows (safety glass) may be required

b Piping and services Entry should be made through the sides or bottom of the enclosuremdashnever through the top

c Mounting Enclosures may be self-supporting wall-mounted or attached to an instrument support Instruments may be flush-mounted located behind windows in the door or mounted on the side

d Insulation The inside of an enclosure may be lined with block insulation foil-faced fiberglass or other suitable insulating material

e Weather protection All line entrances to an enclosure shall be properly sealed to prevent the entrance of weather elements or the external environment Instrument enclosures shall be resistant to corrosive attack by the plant environment All assembly fasteners and other hardware subjected to environmental attack shall be corrosion resistant

f Type of heating Enclosures may be designed for heating with steam (tracing or finned heater) or with an electrical heater or other available heating media

g Temperature indicator A means such as a dial thermometer mounted through the housing wall may be provided to indicate internal housing temperature

632 When an enclosure is used special attention should be given to the electrical classification of the area inside it Refer to R240K for guidance

7 Steam tracing design procedure

71 Freeze protection

711 Tracing to prevent freezing or condensation of process materials in instrument lines should be designed to provide just enough heat to make up the losses from the protected line to the surrounding ambient Its design should be to keep the line temperature 9degF (5degC) above the process material freeze or condensation point at the coldest design conditions The high-temperature difference between available steam-condensing temperatures and the protected fluid freeze points generally results in a much higher margin

712 Tables 3 5 and 7 and Figure 8 show the temperature of traced lines under static no flow conditions and may be used to select the steam pressure insulation and tracer size




These data were developed using a computer program based upon DG86C and verified with tests

713 Steam condenses along the length of the tracer Since this water must be eliminated through the trapping facility by the steam supply pressure maximum usable tracer length is limited by that pressure the condensing rate and the tracer size

714 Tables 4 6 8 and Figure 9 show the heat loss (Btuhbullft) of traced lines under static no flow conditions for various insulation systems tracer sizes and steam supply pressures This data may be used with Table 9 and Figure 10 to determine maximum usable tracer length

715 Example A tracing system is to be provided for a water orifice flowmeter differential-pressure transmitter The coldest expected ambient conditions are 20degF (ndash7degC) with a 101-mile per hour wind

a From Table 1 the 20degF (ndash7degC) temperature with a 10-mile per hour wind has the chilling effect of 2degF (ndash17degC) under calm conditions

b Table 3 shows that 30-psi steam with a fiberglass tape insulation system and 14-inch tracer will keep the traced line well above the freeze point for water when exposed to 2degF (ndash17degC)

c From Table 4 the heat loss for a 14-inch tracer carrying 30-psi steam in 2degF (ndash17degC) weather is 356 Btuhbullft

d To satisfy a heating rate equivalent to this heat loss with a 30-psi steam supply pressure a 38-inch tubing tracer should not exceed 133 feet in length as determined from Figure 10

e The maximum usable length of a 14-inch tubing tracer is determined by multiplying the maximum usable 38-inch tubing length by the appropriate size factor from Table 9 (133 Х 036 = 48 feet)

If the length of the tracer path does not exceed 48 feet the 14-inch tube will be adequate otherwise a larger tracer tube or higher steam supply pressure must be considered

72 Maintaining a constant elevated temperature

721 Heating to maintain a constant elevated temperature is frequently associated with analyzer sample systems or the need to maintain a constant temperature environment for some instrument to ensure its stable performance

722 When steam-tracer systems are used for these applications a heat-transfer cement as specified in SN500M is recommended to enhance heat conduction between the tracer and the heated line or surface to realize better dynamic control response Refer to K11C for guidance in designing tracing systems using heat transfer medium Where additional response improvement is required to satisfy sample system needs jacketed piping should be used

723 Heating system design for these applications must accommodate the heat required to change the phase of the sample material if necessary heat the sample from the inlet temperature to the desired outlet temperature offset heat losses to the ambient under the




most severe anticipated weather conditions and include sufficient reserve energy to control the temperature against expected load upsets

724 Refer to 713 and 714 for considerations that determine maximum tracer length for these systems

725 Example A heat-tracing system is to be designed using a 38-inch tracer with 35-psi steam as the heat source for a 38-inch tubing sample line with 0035-inch wall 100 feet long containing material having an approximate composition of 10 percent carbon dioxide and 90 percent methane by volume The sample is taken from the process at 176degF (80degC) and 80 psig and is returned to the process at 75 psig and 248degF (120degC) The assembly is insulated with half-inch thick glass-fiber insulation per Code 112 Design for 20degF and 15 mile per hour wind

a Determine the stream bulk density to be 01801 Ibft3 and the bulk viscosity to be 987times10ndash6 lbftbulls from DG221A and DG211A respectively

b Determine the flow rate from the Darcy equation and the Reynolds number from DG51C Flow is 341 cubic feet per minute with a Reynolds number of 52000 Since flow is turbulent the nomograph of Figure 9 and factor B from 54 of DG51C can be used to determine if the sample line is sufficiently long to give sufficient surface to transfer the desired amount of heat

c The stream bulk specific heat and bulk thermal conductivity are determined to be 05211 Btulb degF and 00257 Btuh ft2 degFft from DG121A and DG115A respectively

d Factor B is found to be 2076 and applying this factor to the 14-foot length determined from Figure 9 of DG51C yields a minimum length of 674 feet This means the 100-foot sample line is more than ample to handle the heat transfer

e The steady-state heat requirement to raise the sample stream temperature from 176degF (80degC) to 248degF (120degC) is determined to be 1382 Btuh

f Heat loss to the ambient with a temperature of 20degF and a 15-mile per hour wind using DG86C is determined to be 3426 Btuh

g Allow heat equivalent to the steady state sample heating requirement as a reserve to compensate for load upsets and determine the total heat requirement to be 6190 Btuh

h From Figure 10 the maximum equivalent tracer length for this heat load and 35-psig steam is found to be 94 feet Since the factor from Table 9 for 38-inch tubing is 100 94 feet is the maximum allowable length for this design Since it does not equal or exceed the 100 feet required two 50-foot tracers are required Alternate designs would be to use higher-pressure steam or 12-inch tracer

DG standards are just one method of obtaining points of reference




8 Electrical tracing design procedure 81 Standard DE1H defines the considerations to be made when electrical tracing is planned for instrument piping It also includes examples of typical applications and introduces computer program that guides the selection of the most cost effective design and predicts maximum cable operating temperature


821 In general self-regulating heat-tracing cable obtained in a prefabricated traced-tubing assembly or installed in a field-assembled tracing system will be the choice for instrument freeze protection applications


831 Comments related to these applications contained in 721 through 723 apply equally well to electrically heated designs

832 Most heating for these instrument applications can be effectively accomplished using a constant wattage cable

833 Example Assume the heating requirement described in 725 is to be done with constant wattage heating cable

a From 725g the total heat requirement is determined to be 6190 Btuh Since the sample line is 100 feet long this amounts to an average heat input of approximately 62 Btuh3ft or 182 watts per foot

b This heating requirement can be satisfied by two parallel runs of a cable that produces 12 watts of heating per foot




9 Equipment manufacturers Manufacturers of equipment for use in providing heat for instrumentation systems have been listed in the following chart Listing does not imply DuPont approval of a manufacturer This Standard does not exclude consideration of manufacturers not listed Refer to the appropriate referenced specification for such equipment as tubing steam traps strainers thermostats electric power control devices fasteners and insulation systems

Manufacturers of instrument heat tracing equipment

Unt

race

d pr

e-in

sula

ted

tubi

ng b

undl

es

Stea

m tr

aced

pre

-insu

late

d tu

bing

bun

dles

Elec

tric

trac

ed p

re-in

sula

ted

tubi

ng b

undl

es

Hea

t cab

le fo

r fie

ld

fabr

icat

ed tr

acin

g

Am

bien

t air

amp fl

uid

tem

p se

nsin

g va

lve

Mol

ded

AB

Spo

lyur

etha

ne

inst

rum

ent e

nclo

sure

s

Soft

insu

late

d fa

bric

wra

p in

stru

men

t cov

ers

Cable USA DekoronUnitherm Division Cape Coral FL 33909 wwwunithermcccom

X X X X X

Jordan Valve Cincinnati OH 45209 wwwjordanvalvecom

X

OrsquoBrien Corporation St Louis MO 63139 wwwobcorpcom

X X X X X

Ogontz Controls Co Willow Grove PA 19090 wwwogontzcom

X

Parker Hannifin Corporation Parfex Division Ravenna OH 44266 wwwparkercomeadcm1aspcmid=699

X X X

Robroy Industries Stahlin Division Belding MI 48809 wwwrobroycom

X

Thermon Manufacturing Co Cellex Division San Marcos TX 78666 wwwthermoncom

X X X X X X

Tyco Thermal Controls Raychem Division Menlo Park CA 94025 wwwtycothermalcom

X X




Table 1 Wind chill effect

Equivalent temperature degF Calm 40 35 30 25 20 15 10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45

5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -6310 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -7215 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -7720 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -8125 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -8430 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -8735 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -8940 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -9145 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -9350 26 19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -9555 25 18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97

Win

d sp

eed

(mph

)

60 25 17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98

Example To find the equivalent temperature due to a wind speed of 20 mph when the ldquocalmrdquo temperature is 30degF read vertically from 30degF to the intersection with the 20 mph line the equivalent temperature is 3degF

Table 2 Comparative methods and estimated installed cost ratios for new project workmdashdifferential pressure transmitter installation

Method Cost ratioA Electrical heat using preinsulated traced tube bundle 100 B Electrical heat using self-limiting heating cable with tracing and insulation by field 120 C Steam heat using pre-insulated 3-tube bundle and pre-insulated single tube assembly 140 D Steam heat with all piping and insulation assembled and installed by field 145


Insulation 14-inch thick conductivity 048 Btubullnhbullf t 2bulldegFLine size 38-inch OD tube Tracer size 14-inch OD tube

Contact between line and tracer

Ambient temperature degF Steam pressure Psig ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110 15 70 76 83 89 95 101 108 114 121 127 134 140 147 153 30 78 84 90 96 103 109 115 122 128 135 141 148 154 161 60 89 95 101 107 113 119 126 132 138 145 151 158 164 171 80 94 100 106 112 118 125 131 137 143 150 156 163 169 176

120 102 108 114 120 127 133 139 145 151 158 164 171 177 184




Table 4 Heat loss (Btuhbullft) from insulated lines fiberglass tape Code 992

Insulation 14-inch thick conductivity 048 Btubull inhbullf t 2bulldegF Line size 38-inch OD tube Contact between line and tracer Tracer size 14-inch OD tube


120 48 47 46 45 43 42 41 40 38 37 36 35 33 32




Table 5 Temperature (degF) maintained inside insulated lines calcium silicate Code 102 or 1021

Insulation 1-in thick conductivity 048 Btu bullinhbullft2bulldegF Contact between line and tracer Ambient temperature ordmF Line size

and type (in)

Tracer tube size OD (in)

Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238

See SN100M For stainless steel piping use calcium silicate Code 1021 which is inhibited Tubes sizes are OD





Insulation 1-in thick conductivity 040 Btubullinhbull ft2bulldegF Contact between line and tracer Ambient temperature ordmF Line size

and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32

See SN100M For stainless steel piping use calcium silicate Code 1021 which is inhibited

Tubes sizes are OD





Insulation 1-in thick conductivity 030 Btubullinhbull ft2bulldegF Contact between line and tracer Ambient temperature degF Line size

and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD




Table 8 Heat loss (Btuhmiddotft) from insulated lines glass fiber Code 112

Insulation 1-in thick conductivity 030 Btubullinhbullft2bullF Contact between line and tracer Ambient temperature degF Line size

and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD




Table 9 Size factors to determine maximum length of steam tracer (to be applied to Figure 10)

OD of tracer (in) Size factor Ks

18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900




Figure 1 Typical steam-tracing system for freeze protection




Figure 2 Typical steam-tracing system for constant temperature control




Figure 3 Typical electrical-tracing system for freeze protection




Figure 4 Typical electrical-tracing system for constant temperature control




Figure 5 Prefabricated steam traced tubing bundles (see Sections 3 and 6)

Uniterm No 2204 Parker Temptube Type 3221 Thermon Thermotube Type MI OrsquoBrien Type TPL

Uniterm No 2203 Parker Temptube Type 3122 Thermon Thermotube Type MP OrsquoBrien Type TPH

Uniterm No 2202 Parker Temptube Type 3211 Thermon Thermotube Type SI OrsquoBrien Type TPL

Uniterm No 2201 Parker Temptube Type 3112 Thermon Thermotube Type SP OrsquoBrien Type TPH

Uniterm No 2200 Parker Temptube Series 3000 Thermon Thermotube Type SL OrsquoBrien S-Line




Figure 6 Prefabricated electrically heated tubing bundles (see Section 6)

Uniterm No 2252 Parker Temptube Type 4300 Series Thermon Thermotube Type SE

Uniterm No 2262 Parker Temptube Type 4300 Series Thermon Thermotube Type ME


Uniterm No 2266 Parker Temptube Type 4400 Series Thermon Thermotube Type ME OrsquoBrien Type TPE

Uniterm No 2256 Parker Temptube Type 4400 Series Thermon Thermotube Type SE OrsquoBrien Type TPE




Figure 8 Process tube temperature versus distance from steam inlet for 30 and 80 psig steam and various ambient temperatures

Unitherm 2203-40B31




Figure 9 Average heat loss versus ambient temperature for various inlet steam pressures

Unitherm 2203-40B31




Figure 10 Tracer length versus heat loss (see Section 714)

Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er

Heat Loss Btuhsdotft

Note Use factor from Table 9 for tracer sizes other than 38 inch



1 Scope

2 Reference Standards and specifications

3 General

4 Heating medium selection

5 Safety considerations


61 Steam systems

62 Electric systems





8 Electrical tracing design procedure



9 Equipment manufacturers





















1 Scope This Standard presents design and application information for use in providing heat tracing for instrumentation Both steam and electrical tracing systems are considered

2 Reference Standards and specifications Web access to the following standards is provided from this section only R240K Electrical Instruments Connected to Flammable Process Materials K11C Steam Tracing H6P Winter Outdoor Temperature Conditions for Process and Comfort Air Conditioning

Design P6B Steam Traps and Strainers DE1H Electrical Pipeline Heat Tracing Design and Application DE5H Power Control Devices in Electrical Heating and Other Variable Power Applications DE6H Temperature Control of Electrical Heating for Pipelines and Snow Melting DE1Q Emergency and Standby Power Systems DG86C Heat Losses from Bare and Insulated Surfaces SE323B Electrical Heat-Tracing Cable Strips and Tapes SE404B Thermostats for Pipeline and Vessel Heating Circuits SN305A Insulation Systems for Instrument Piping and Tubing Minus 100degF to Plus 1200degF SN100M Code Specification for Preformed Block and Pipe Insulation SN500M Fluid and Plastic Insulation SN900M Fasteners and Miscellaneous The National Electrical Code (NEC)

3 General 31 Heating must be provided for instrument systems containing process fluids where either of the following needs exists

311 It is necessary to protect against freeze-up when ambient temperatures are below the freeze point of the process material This condition may exist only seasonally during cold weather or may exist continuously where materials with elevated freeze points are involved

312 The process fluid must be controlled at an elevated temperature to avoid phase change or to satisfy an instrument operating requirement as would be the case with analyzer sample piping

32 The methods for winterizing instrumentation vary with the minimum temperature to be expected the maximum number of consecutive hours that subfreezing temperatures can be expected to exist and the process material involved

The National Electrical Code (NEC) on which Subparts of OSHA regulations CFR 1910 is based may not be the latest edition However it is DuPont practice to use for reference the current edition of consensus Standards This Standard meets or exceeds the requirements of the NEC


Copyright copy 2001 2009 EI du Pont de Nemours and Company All Rights Reserved Used under Copyright License of 29



































61 Steam systems



































62 Electric systems




















































































Unt

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Stea

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X X X X X


X


X X X X X


X


X X X


X


X X X X X X


X X






5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -6310 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -7215 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -7720 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -8125 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -8430 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -8735 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -8940 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -9145 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -9350 26 19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -9555 25 18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97

Win

d sp

eed

(mph

)

60 25 17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98








120 102 108 114 120 127 133 139 145 151 158 164 171 177 184







120 48 47 46 45 43 42 41 40 38 37 36 35 33 32






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems






























































61 Steam systems



































62 Electric systems




















































































Unt

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d fa

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X X X X X


X


X X X X X


X


X X X


X


X X X X X X


X X






5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -6310 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -7215 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -7720 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -8125 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -8430 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -8735 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -8940 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -9145 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -9350 26 19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -9555 25 18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97

Win

d sp

eed

(mph

)

60 25 17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98








120 102 108 114 120 127 133 139 145 151 158 164 171 177 184







120 48 47 46 45 43 42 41 40 38 37 36 35 33 32






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems




















































62 Electric systems




















































































Unt

race

d pr

e-in

sula

ted

tubi

ng b

undl

es

Stea

m tr

aced

pre

-insu

late

d tu

bing

bun

dles

Elec

tric

trac

ed p

re-in

sula

ted

tubi

ng b

undl

es

Hea

t cab

le fo

r fie

ld

fabr

icat

ed tr

acin

g

Am

bien

t air

amp fl

uid

tem

p se

nsin

g va

lve

Mol

ded

AB

Spo

lyur

etha

ne

inst

rum

ent e

nclo

sure

s

Soft

insu

late

d fa

bric

wra

p in

stru

men

t cov

ers


X X X X X


X


X X X X X


X


X X X


X


X X X X X X


X X






5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -6310 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -7215 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -7720 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -8125 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -8430 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -8735 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -8940 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -9145 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -9350 26 19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -9555 25 18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97

Win

d sp

eed

(mph

)

60 25 17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98








120 102 108 114 120 127 133 139 145 151 158 164 171 177 184







120 48 47 46 45 43 42 41 40 38 37 36 35 33 32






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems











































































































Unt

race

d pr

e-in

sula

ted

tubi

ng b

undl

es

Stea

m tr

aced

pre

-insu

late

d tu

bing

bun

dles

Elec

tric

trac

ed p

re-in

sula

ted

tubi

ng b

undl

es

Hea

t cab

le fo

r fie

ld

fabr

icat

ed tr

acin

g

Am

bien

t air

amp fl

uid

tem

p se

nsin

g va

lve

Mol

ded

AB

Spo

lyur

etha

ne

inst

rum

ent e

nclo

sure

s

Soft

insu

late

d fa

bric

wra

p in

stru

men

t cov

ers


X X X X X


X


X X X X X


X


X X X


X


X X X X X X


X X






5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -6310 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -7215 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -7720 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -8125 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -8430 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -8735 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -8940 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -9145 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -9350 26 19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -9555 25 18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97

Win

d sp

eed

(mph

)

60 25 17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98








120 102 108 114 120 127 133 139 145 151 158 164 171 177 184







120 48 47 46 45 43 42 41 40 38 37 36 35 33 32






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems































5 36 31 25 19 13 7 1 -5 -11 -16 -22 -28 -34 -40 -46 -52 -57 -6310 34 27 21 15 9 3 -4 -10 -16 -22 -28 -35 -41 -47 -53 -59 -66 -7215 32 25 19 13 6 0 -7 -13 -19 -26 -32 -39 -45 -51 -58 -64 -71 -7720 30 24 17 11 4 -2 -9 -15 -22 -29 -35 -42 -48 -55 -61 -68 -74 -8125 29 23 16 9 3 -4 -11 -17 -24 -31 -37 -44 -51 -58 -64 -71 -78 -8430 28 22 15 8 1 -5 -12 -19 -26 -33 -39 -46 -53 -60 -67 -73 -80 -8735 28 21 14 7 0 -7 -14 -21 -27 -34 -41 -48 -55 -62 -69 -76 -82 -8940 27 20 13 6 -1 -8 -15 -22 -29 -36 -43 -50 -57 -64 -71 -78 -84 -9145 26 19 12 5 -2 -9 -16 -23 -30 -37 -44 -51 -58 -65 -72 -79 -86 -9350 26 19 12 4 -3 -10 -17 -24 -31 -38 -45 -52 -60 -67 -74 -81 -88 -9555 25 18 11 4 -3 -11 -18 -25 -32 -39 -46 -54 -61 -68 -75 -82 -89 -97

Win

d sp

eed

(mph

)

60 25 17 10 3 -4 -11 -19 -26 -33 -40 -48 -55 -62 -69 -76 -84 -91 -98








120 102 108 114 120 127 133 139 145 151 158 164 171 177 184







120 48 47 46 45 43 42 41 40 38 37 36 35 33 32






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems
































120 48 47 46 45 43 42 41 40 38 37 36 35 33 32






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems































and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 152 155 158 161 165 168 171 174 178 181 185 188 192 19530 167 170 173 176 179 182 186 189 192 196 199 202 206 21060 187 190 193 196 199 202 205 209 212 215 219 222 226 22980 197 200 203 206 209 212 215 218 222 225 228 232 235 239

38 tube 14

120 212 215 218 221 224 227 230 234 237 240 244 247 250 25415 165 168 170 173 176 179 182 184 187 190 193 196 199 20230 181 184 186 189 192 194 197 200 203 206 209 212 215 21860 203 205 208 211 213 216 219 221 224 227 230 233 236 23980 213 216 218 221 224 226 229 232 235 238 240 244 247 250

38 tube 38

120 230 233 235 238 240 243 246 249 251 254 257 260 263 26615 141 145 148 152 155 159 162 166 170 174 177 181 185 18930 155 159 162 165 169 172 176 180 183 187 191 195 199 20360 174 177 180 184 187 191 194 198 202 205 209 213 217 22180 183 186 190 193 196 200 203 207 211 214 218 222 226 230

12 tube 14

120 197 201 204 207 211 214 218 221 225 229 232 236 240 24415 153 156 159 162 165 169 172 175 178 182 185 189 192 19630 168 171 174 177 180 183 186 190 193 196 200 203 207 21060 188 191 194 197 200 203 206 210 213 216 219 223 226 23080 198 201 204 207 210 213 216 219 223 226 229 233 236 239

12 tube 38

120 214 217 219 222 225 229 232 235 238 241 245 248 251 25515 110 114 119 123 128 132 137 142 147 152 157 162 167 17230 121 125 130 134 139 143 148 153 158 162 167 172 178 18360 136 140 144 149 153 158 163 167 172 177 182 187 192 19780 143 147 152 156 161 165 170 174 179 184 189 194 199 204

1 pipe 14

120 155 159 163 168 172 177 181 186 180 195 200 205 210 21515 135 139 142 146 150 154 157 161 165 169 173 178 182 18630 149 152 156 159 163 167 171 174 178 182 186 190 195 19960 166 170 174 177 181 184 188 192 196 200 204 208 212 21680 175 179 182 186 189 193 197 201 205 208 212 216 220 225

1 pipe 38

120 189 193 196 200 203 207 211 214 218 222 226 230 234 238







and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems































and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 19 18 17 17 16 16 15 14 14 13 12 12 11 10 30 21 20 19 19 18 18 17 16 16 15 14 14 13 12 60 23 23 22 21 21 20 20 19 18 18 17 16 16 15 80 24 24 23 23 22 21 21 20 20 19 18 18 17 16

38 tube 14

120 27 26 25 25 24 24 23 22 22 21 20 20 19 18 15 24 24 23 22 21 20 20 19 18 17 16 15 14 14 30 27 26 25 25 24 23 22 21 20 20 19 18 17 16 60 30 30 29 28 27 26 26 25 24 23 22 21 21 20 80 32 31 31 30 29 28 27 27 26 25 24 23 22 21

38 tube 38

120 35 34 33 33 32 31 30 29 29 28 27 26 25 24 15 21 20 19 19 18 17 17 16 15 14 14 13 12 11 30 23 22 22 21 20 19 19 18 17 17 16 15 14 14 60 26 25 24 24 23 22 22 21 20 20 19 18 17 17 80 27 27 26 25 25 24 23 22 22 21 20 20 19 18

12 tube 14

120 29 29 28 28 27 26 25 25 24 23 23 22 21 20 15 28 27 26 25 24 23 22 22 21 20 19 18 17 15 30 31 30 29 28 27 26 25 24 23 22 21 20 19 18 60 35 34 33 32 31 30 29 28 27 26 25 24 23 22 80 37 36 35 34 33 32 31 30 29 28 27 26 25 24

12 tube 38

120 40 39 38 37 36 35 34 33 33 32 31 30 29 28 15 27 26 25 24 23 23 22 21 20 19 18 17 16 15 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 60 33 32 31 31 30 29 28 27 26 25 24 23 22 21 80 35 34 33 32 32 31 30 29 28 27 26 25 24 23

1 pipe 14

120 38 37 36 35 34 34 33 32 31 30 29 28 27 26 15 33 32 31 30 29 28 27 26 24 23 22 21 20 18 30 36 35 34 33 32 31 30 29 28 27 25 24 23 22 60 41 40 39 38 37 36 35 33 32 31 30 29 28 26 80 43 42 41 40 39 38 37 36 35 33 32 31 30 29

1 pipe 38

120 47 46 45 44 43 42 41 39 38 37 36 35 34 32


Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems































and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 169 171 173 176 178 181 183 186 189 192 194 197 200 20330 185 187 189 192 194 197 199 202 205 207 210 213 216 21960 206 209 211 213 216 218 221 223 226 229 231 234 237 24080 217 219 222 224 226 229 231 234 236 239 242 245 247 250

38 tube 14

120 234 236 238 241 243 245 248 250 253 256 258 261 264 26715 180 182 184 186 189 191 193 195 197 200 202 205 207 21030 197 199 201 203 205 208 210 212 214 217 219 221 224 22660 221 222 224 226 229 231 233 235 237 240 242 244 247 24980 232 234 236 238 240 242 244 246 248 251 253 255 258 260

38 tube 38

120 250 252 254 256 258 260 262 264 266 269 271 273 276 27815 159 161 164 167 170 173 175 178 181 185 188 191 194 19730 174 177 179 182 185 187 190 193 196 199 202 206 209 21260 194 197 200 202 205 208 210 213 216 219 222 226 229 23280 204 207 209 212 215 218 220 223 226 229 232 235 239 242

12 tube 14

120 220 223 225 228 230 233 236 239 242 245 248 251 254 25715 170 172 174 177 179 182 184 187 189 192 195 198 201 20430 186 188 190 193 195 198 200 203 205 208 211 214 216 21960 208 210 212 214 217 219 222 224 227 229 232 235 238 24180 218 220 223 225 227 230 232 235 237 240 243 245 248 251

12 tube 38

120 235 237 239 242 244 247 249 251 254 257 259 262 265 26815 129 132 136 140 143 147 151 155 159 164 168 172 176 18130 141 145 148 152 156 160 163 167 171 176 180 184 188 19360 158 162 165 169 172 176 180 184 188 192 196 200 204 20980 166 170 173 177 180 184 188 192 196 200 204 208 212 217

1 pipe 14

120 179 183 186 190 193 197 201 205 208 212 216 221 225 22915 153 156 159 162 165 168 171 174 177 181 184 187 191 19430 168 171 173 176 179 182 185 188 192 195 198 202 205 20960 188 190 193 196 199 202 205 208 211 214 217 221 224 22880 197 200 203 205 208 211 214 217 220 224 227 230 234 237

1 pipe 38

120 212 215 218 221 223 226 229 232 235 239 242 245 248 252

See SN100M

Tubes sizes are OD






and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems































and type (in)


Steam pressure

(psig) ndash20 ndash10 0 10 20 30 40 50 60 70 80 90 100 110

15 15 15 14 14 14 13 13 12 11 11 10 10 9 9 30 17 17 16 16 15 15 14 14 13 13 12 12 11 10 60 19 19 18 18 17 17 17 16 15 15 14 14 13 13 80 20 20 20 19 18 18 18 17 17 16 16 15 14 14

38 tube 14

120 22 22 21 21 21 20 20 19 19 18 18 17 16 16 15 20 19 19 18 18 17 16 16 15 14 14 13 12 11 30 22 22 21 20 20 19 18 18 17 16 16 15 14 14 60 25 24 24 23 23 22 21 21 20 19 19 18 17 17 80 27 26 25 25 24 24 23 22 22 21 20 20 19 18

38 tube 38

120 29 28 28 27 27 26 25 25 24 24 23 22 21 21 15 17 17 16 16 15 15 14 14 13 12 12 11 10 10 30 19 19 18 18 17 17 16 15 15 14 14 13 12 12 60 22 21 21 20 20 19 19 18 17 17 16 16 15 14 80 23 22 22 21 21 20 20 19 19 18 17 17 16 16

12 tube 14

120 25 25 24 24 23 22 22 21 21 20 20 19 18 18 15 23 22 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 21 20 19 18 17 17 16 60 29 28 28 27 26 25 25 24 23 22 22 21 20 19 80 31 30 29 29 28 27 26 26 25 24 23 23 22 21

12 tube 38

120 33 33 32 31 31 30 29 29 28 27 26 25 25 24 15 23 23 22 21 20 20 19 18 17 16 16 15 14 13 30 26 25 24 23 23 22 21 20 20 19 18 17 16 15 60 29 28 27 27 26 25 25 24 23 22 21 21 20 19 80 30 30 29 28 28 27 26 25 25 24 23 22 21 21

1 pipe 14

120 33 32 32 31 30 30 29 28 27 27 26 25 24 23 15 28 27 26 25 25 24 23 22 21 20 19 18 17 16 30 31 30 29 28 27 27 26 25 24 23 22 21 20 19 60 35 34 33 32 31 31 30 29 28 27 26 25 24 23 80 37 36 35 34 34 33 32 31 30 29 28 27 26 25

1 pipe 38

120 40 39 38 38 37 36 35 34 33 32 31 30 29 28

See SN100M

Tubes sizes are OD






18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems































18 14 38 12 58 34 78

1-18

0018 036 100 191 306 436 545 900







































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems
































































Unitherm 2203-40B31





Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems






























Unitherm 2203-40B31





Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems






























Max

imum

Usa

ble

Leng

th o

f 38

inch

Tub

ing

Trac

er





1 Scope


3 General




61 Steam systems

62 Electric systems




























dr1k

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