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Previous Issue: 9 September 2008 Next Planned Update: 4 May 2013Revised paragraphs are indicated in the right margin Page 1 of 25Primary contact: Al-Juaib, Mohammed Khalifah on 966-3-8730222

CopyrightSaudi Aramco 2009. All rights reserved.

Materials System Specification 34-SAMSS-711 26 January 2009

Control ValvesInstrumentation Standards Committee Members

Al-Juaib, Mohammed Khalifah, ChairmanTuin, Rienk, Vice Chairman

Al-Dakhil, Tareq Khalil Al-Faer Al Sharif, Hisham Mohammed Al-Harbi, Ahmed Saad Al-Jumah, Yousif Ahmed Al-Khalifa, Ali Hussain Al-Qaffas, Saleh Abdal Wahab Al-Sahan, Fawaz Adnan Al-Saleem, Hesham Salem

Chetia, Manoj Ell, Steven TalFadley, Gary LowellFalkenberg, Anton RaymondGrainger, John Francis

Mahmood, Balal Mathew, VinodQarni, Mahdi AliTrembley, Robert James

Saudi Aramco DeskTop Standards

Table of Contents

1 Scope............................................................. 22 Conflicts and Deviations................................ 23 References..................................................... 24 Environmental Conditions.............................. 65 Information Required with Quotation............. 66 Materials, Design, Fabrication

and Assembly......................................... 77 Noise Level Requirements........................... 218 Marking and Name Plate.............................. 229 Painting........................................................ 2210 Documentation............................................. 2211 Inspection and Testing Requirements.......... 2312 Requirements for Shipment.......................... 25

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Document Responsibility: Instrumentation 34-SAMSS-711Issue Date: 26 January 2009

Next Planned Update: 4 May 2013 Control Valves

Page 2 of 25

1 Scope

This specification, together with the Purchase Order, Instrument Specification Sheet(ISS) Form 8020-711-ENG, Form 8020-712-ENG or Form 8020-713-ENG,

NMR-7925, and Inspection Requirements Form 175-340100 or 175-340150 define theminimum mandatory requirements for general service pneumatically operated steelcontrol valves up to and including Class 2500 ratings. This specification is notapplicable to on/off valves.

Commentary Note:

Some control valves are used in on/off service or interlock applications. Such valves are part of the scope of this standard.

2 Conflicts and Deviations

2.1 Any conflicts between this specification and other applicable Saudi AramcoMaterials System Specifications (SAMSSs), Engineering Standards (SAESs),Standard Drawings (SASDs), or industry standards, codes, and forms shall beresolved in writing by the Company or Buyer Representative through theManager, Process & Control Systems Department of Saudi Aramco, Dhahran.

2.2 Direct all requests to deviate from this specification in writing to the Company orBuyer Representative, who shall follow internal company procedure SAEP-302and forward such requests to the Manager, Process & Control SystemsDepartment of Saudi Aramco, Dhahran.

3 References

Material or equipment supplied to this specification shall comply with the latest editionof the references listed below, unless otherwise noted.

3.1 Saudi Aramco References

Saudi Aramco Engineering Procedure

SAEP-302 Instructions for Obtaining a Waiver of a

Mandatory Saudi Aramco Engineering Requirement

Saudi Aramco Engineering Standards

SAES-A-206 Positive Material Identification

SAES-J-700 Control Valves
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Saudi Aramco Forms and Data Sheets

Form 8020-711-ENG ISS - Globe/Angle Control Valves (sheets 1 & 2)

Form 8020-712-ENG ISS - Ball Control Valves (sheets 1 & 2) Form 8020-713-ENG ISS - Butterfly / Rotary Plug Control Valves

(sht 1 & 2)

Form SA NMR-7925 Non-Material Requirements for Valves - All Types

Saudi Aramco Inspection Requirements

Form 175-340100 V ALVES : Control, Steel, General Service, Pneumatic Operated Up to and includingClass 2500 ratings

Form 175-340150 V ALVES

: Control, Non-General ServiceSaudi Aramco Standard Drawing

AB-036386 Hardness Testing for Welding ProcedureQualifications

3.2 Industry Codes and Standards

American National Standards Institute/Fluid Controls Institute, Inc.

ANSI/FCI 70-2 (1991) Control Valve Seat Leakage(Formerly ANSI B16.104)

American Petroleum Institute

API STD 6D Pipeline Valves

API STD 607 Testing of Valves Fire Type-testing Requirements

API STD 609 Butterfly Valves, Double Flanged Lug and Wafer-Type

American Society of Mechanical Engineers

ASME B1.20.1 Pipe Threads, General Purpose (Inch)

ASME B16.5 Pipe Flanges and Flanged Fittings

ASME B16.10 Face-to-Face and End-to-End Dimensions ofValves

ASME B16.34 Valves Flanged, Threaded and Welding End

ASME B31.3 Process Piping
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ASME B46.1 Surface Texture (Surface Roughness, Waviness,and Lay)

ASME SEC VIII D1 Rules for Construction of Pressure Vessels American Society for Testing and Materials

American Society for Testing and Materials

ASTM A105 Standard Specification for Carbon Steel Forgings for Piping Applications

ASTM A182 Standard Specification for Forged or Rolled Alloyand Stainless Steel Pipe Flanges, Forged

Fittings, and Valves and Parts for High-Temperature Service

ASTM A216 Standard Specification for Steel Castings, Carbon,Suitable for Fusion Welding, for HighTemperature Service

ASTM A217 Standard Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service

ASTM A350 Standard Specification for Carbon and Low-AlloySteel Forgings Notch Toughness Testing for

Piping Components

ASTM A351 Standard Specification for Castings, Austenitic, for Pressure-Containing Parts

ASTM A352 Steel Castings, Ferritic and Martensitic for Pressure Containing Parts, Suitable for Low-Temperature Service

ASTM A488 Qualification of Procedures for Welding Castings

ASTM E446 Standard Reference Radiographs for SteelCastings up to 2 inch (51 mm) in Thickness

The Instrumentation, Systems and Automation Society - ISA

Commentary:

IEC standards equivalent to the ISA standards referenced herein are alsoacceptable.

ANSI/ISA 51.1 Process Instrumentation Terminology

ANSI/ISA 75.01.01 Flow Equations for Sizing Control Valves
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International Organization for Standardization

ISO 15156 Petroleum and Natural Gas Industries - Materials

for Use in H 2S Containing Environments in Oiland Gas Production

Manufacturers Standardization Society

MSS SP-55 Quality Standard for Steel Castings - Visual Method

National Fire Protection Association

NFPA 70 National Electrical Code

Scientific Apparatus Manufacturer Association

SAMA PCM 31.3 Vibration Testing

3.3 All engineering units shall be in the International System of Units (SI).Equivalent values in conventional units enclosed in parentheses may follow theSI units. When not critical, the equivalent conventional values may be roundedto their nearest practical values.

3.4 The terminology and nomenclature used in ISA 51.1 and ISA 75.05.01 apply tothis specification.

4 Environmental Conditions

4.1 Relative Humidity: Minimum 5%, maximum 95% (condensing)

Temperature: Minimum 0C, maximum 65C

Wind: Steady wind velocities up to 130 km/h and gusts up to 160 km/h.

4.2 The normal air-borne dust concentration shall be considered as 1 mg/m. Duringsand storms dust concentrations may reach 500 mg/m. The dust particle sizedistribution is 95% smaller than 20 micrometers and 50% smaller than1.5 micrometers. The dust contains salts of sodium, magnesium, aluminum andcalcium, which are critically corrosive when wet.

4.3 Control valves and accessories installed offshore, including nearshore locationswithin 1 km inland from the shoreline, shall be protected against aboveconditions and also against air-borne sea water spray and wet salt accumulation.

5 Information Required with Quotation

The following information shall be supplied with the quotation:
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Valve capacity, noise prediction, and body exit fluid velocity calculations for eachspecified operating condition;

Actuator sizing data; Manufacturers control valve specification sheet;

ISS marked-up (i.e., completed and/or corrected) to represent the quoted valve;

Sketch with outline dimensions of valve and actuator with approximate weight;

Air consumption data;

Valve capacity data as a function of travel, either in graphical or tabular form;

Valve trim performance data as a function of travel, including liquid pressurerecovery factor, cavitation index and pressure drop ratio factor;

Confirmation that all electrical equipment and installation of each valve will meetthe NEC requirements for the electrical area classification specified on the ISS;

Confirmation for each quoted valve that it fully meets the specified process servicesfor trouble free operation;

Additional Documentation covered by SA NMR-7925 Non-MaterialRequirements (NMR) for Valves - All Types, as specified to be submitted with thequotation.

This information is necessary and will be used to complete the technical evaluation ofthe quotation. The quotation will be considered technically unacceptable if any of the

information requested is not included.

6 Materials, Design, Fabrication and Assembly

6.1 General

The manufacturer is responsible for the design, construction and the durabilityof the control valves for the specified process services. If there is no valve bodystyle specified, the manufacturer shall recommend a control valve body stylefully meeting the specified process services.

Control valves are classified into two main categories based on Application asdefined in SAES-J-700. These categories are: General Service and Non-GeneralService.

6.2 Material

The materials specified are minimum requirements and the manufacturer needsto verify and re-confirm that the selections fully meet the specified processservices, including anticipated effects of corrosion and erosion.
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Materials specified on the ISS shall be in accordance with the subject standardcovered by the following abbreviations, unless otherwise specified in thePurchase Order:

105 ASTM A105

F5 ASTM A182 Gr. F5

F9 ASTM A182 Gr. F9

F11 ASTM A182 Gr. F11

F304 ASTM A182 Gr. F304

F316 ASTM A182 Gr. F316

F347 ASTM A182 Gr. F347

WCB ASTM A216 Gr. WCBWCC ASTM A216 Gr. WCC

WC6 ASTM A217 Gr. WC6

WC9 ASTM A217 Gr. WC9

WC12 ASTM A217 Gr. C12

LF3 ASTM A350 Gr. LF3

CF8M ASTM A351 Gr. CF8M

CF3M ASTM A351 Gr. CF3M

CF8C ASTM A351 Gr.CF8C

LCB ASTM A352 LCB

LCC ASTM A352 LCC

LC2 ASTM A352 LC2

LC3 ASTM A352 LC3

A6 Alloy 6 (Solid Stellite No. 6)

A12 Alloy 12 (Solid Stellite No. 12)

A20 Alloy 20

CER Ceramic

COB Cobalt

DUPL Duplex Stainless Steel

HAST Hasteloy C

M400 Monel 400
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M500 Monel 500

NIT50 Nitronic 50 (Nitraded Stainless Steel)

TC Tungsten Carbide17-4 17- 4 PH Stainless Steel

304 AISI 304 Stainless Steel


316L AISI 316L Stainless Steel




440 AISI 440-C Stainless Steel

600 Inconel 600

625 Inconel 625

The following materials shall not be used for control valve bodies and bonnets:ASTM A217 Gr. C5 and ASTM A216 Gr. WCA.

Requirements for other material standards are covered in the Purchase Order.

Material Certificates or Material Test Reports, signed by the manufacturer, shall

be provided as minimum for all body and trim materials. Material Test Reportsshall be furnished for body and bonnet materials (and bolting materials whenISO 15156 service is specified on the ISS) in accordance with EN 10204, 3.1.Material Test Reports for trim materials and all other materials in contact withwetted components shall be furnished per EN 10204, 2.2.

6.3 Body and Bonnet

6.3.1 Valve design, body pressure-temperature rating and minimum wallthickness shall comply with ASME B16.34. Where pressurecontaining parts are of a forged material and the non-destructive testingof the welds joining the parts results in a joint efficiency of 1 perASME B31.3 Table 302.3.4 then the specified minimum wall thicknesscan be reduced by 25%. The body rating shall be equal to or higherthan the flange rating.

6.3.2 Welding procedures, performance of welders and welding operators atthe foundry and manufacturer shall meet the requirements ofASTM A488 and other ASME codes if applicable.
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Certificates for castings shall include weld repair data including extentof repair, WPS, welder qualifications, post weld heat treatment and

NDE following the repair(s). Repair welding shall be performed as perASME B16.34 using a properly qualified and approved procedure andshall conform to the material specification of the casting includingrequirements for post weld heat treatment. A repair procedure mustinclude a method statement regarding the excavation, NDT, andwelding requirements. All welding procedure specifications,

performance qualification records and weld map documents must beavailable for the purchaser inspector upon his request. The controlvalve shall be re-hydrotested after any welding or weld repair and any

post weld heat treatment on the body or bonnet.

For non-general service valves, repair of major defects shall not be

performed without the knowledge of the Company. Welding, NDEand heat treatment procedures for major weld repairs of non-generalservice valves require submittal and approval by the Company prior toaffecting the repairs. Weld repairs shall be considered major if any ofthe following conditions apply:

a) Castings leak during hydrostatic testing

b) The depth of the repair cavity prepared for welding exceeds 20%of the wall thickness or 25 mm (1 in), whichever is smaller

c) The surface area of the repair cavity exceeds 65 cm (10 in).

6.3.3 Flanged connections shall be raised face (RF) conforming toASME B16.5. Separable flanges, flanges with tag welds, slip-onflanges or flanges with partial penetration welding are not acceptable.Flangeless valves shall have centering means (e.g., lugs, holes, orequal) to ensure proper alignment of valve and gasket. Dimensions offlanges over 24 inch size shall conform to the standard drawing(s)specified in the Purchase Order.

6.3.4 The gasket contact surface texture of raised-face flanged valves andflangeless valves shall be smooth machine-finish between 3.2 to 6.4micrometers Ra conforming to ASME B46.1. For hydrogen services,

when specified on the ISS, the gasket contact surface texture shall notexceed 3.2 micrometers Ra.

6.3.5 Face-to-face dimensions of control valves shall conform to one of thefollowing standards as applicable, unless otherwise specified on theISS:

ANSI/ISA 75.08.01, ANSI/ISA 75.08.02, ANSI/ISA 75.08.06,
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ANSI/ISA 75.22, API STD 6D, API STD 609, IEC 60534-3-2.

Flanged control valves not covered by any of the above references,

shall comply with ASME B16.10 unless otherwise specified on theISS.

6.3.6 In wet sour services all parts, welds and heat-affected zones of weldsexposed to the process fluid shall meet the hardness and heat treatmentrequirements as per ISO 15156. Welding procedures for weldsexposed to the process fluid shall be hardness tested in accordance withStandard Drawing AB-036386 with a maximum allowable hardness ofVHN 250 or Rockwell C 22. Austenitic stainless steels and nickel

based alloys are not required to be hardness tested, however they shallcomply with the ISO 15156 requirements. To prevent sulfide stress

cracking (SSC) the fabrication shall be strictly in accordance with theheat treatment requirements and hardness limitations of ISO 15156, including materials under overlays, platings or coatings.

In wet sour services the bolting for body, bonnet and cover shall be inaccordance with ISO 15156.

Inspection reports and Material Certificates or Material Test Reports,shall be furnished to confirm that materials comply with the ISO 15156requirements.

6.3.7 Threaded connections shall be NPT and comply with ASME B1.20.1.

6.3.8 Bonnets shall be of the integral or bolted type construction with fullyretained gasketing. Threaded bonnets are not acceptable.

6.4 Sliding Stem Valves

6.4.1 Straight globe valves shall be single or double ported, as specified onthe ISS. Angle globe valves shall be single ported.

6.4.2 Globe valves shall be top and bottom guided, double top-stem guidedor stem and cage guided.

6.4.3 Axial flow valve body shall be single piece. Piston is to be guidedover the full stroke. Piston is to be permanently locked to the pistonrod.

6.5 Rotary Valves

The trim position shall be indicated by an engraved mark on the end of the shaft.The shaft design of rotary control valves shall prevent blowout.
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The shaft design of rotary control valves shall prevent excessive shaft deflectionfor the process conditions specified on the ISS.

6.5.1 Ball Valves

The seat ring and seat joint area of the ball valve, or segmented ballvalve, shall be designed for continuous throttling control of the processservice. Stem seals shall be resistant to vibration.

6.5.2 Butterfly Valves

6.5.2.1 Conventional flat disc/vane type butterfly valves shall besized for a maximum travel of 60 degrees opening. Travel inexcess of 60 degrees opening may only be applied when thedisc/vane is specifically designed for control services up to90 degrees opening, under low dynamic torque requirements.Butterfly valve trims enabling stable control beyond 60degrees opening include a fishtail disc/vane, angular offsetdisc/vane, cambered disc/vane, fluted disc/vane and S-discdesigns.

6.5.2.2 The actuator end of valve stem shall be splined or keyed.Shear pins are not acceptable. The shear safety factor shall

be minimum 150% at the specified shut-off pressure dropcondition. The valve stem bearing shall be designed to

prevent the stem guide bushing from rotating in the valve body. Bearing material shall be selected to prevent gallingof the bearing or valve stem.

6.5.3 Plug/Disc Valves

Plugs and discs shall be a single casting to form the seating surface, joining arm and hub.

Valve body seat shall consist of a removable seat ring with a seatretainer ring.

If a stub shaft construction is furnished, each stub shaft shall beinserted into the disc hub for a distance of at least 1 times the shaftdiameter.

6.6 Trim

6.6.1 Trim materials shall be selected to withstand corrosion, erosion andwear. Material combinations, especially for cage/piston type trims,shall be selected for maximum galling resistance of mating surfaces by

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means of necessary hardness differentials or galling resistant materialcombinations.

6.6.2 AISI 300- and 400- series stainless steel shall be used as a minimum.Carbon steel or plated carbon steel trims are not acceptable.

6.6.3 Trim materials, or trim hard facing materials, with a hardness of atleast 38 HRC shall be provided for control valves in erosive, cavitatingor flashing services.

6.6.4 Hard faced trims, or solid Stellite or Colmonoy type trims shall be usedin erosive type services, including steam and water applications with

pressure drop conditions exceeding 350 kPa (51 psi) and all otherapplications with pressure drop conditions exceeding 4000 kPa(508 psi). The manufacturer shall use harder materials, includingTungsten Carbide where appropriate to ensure acceptable service life.

6.6.5 Solid tungsten carbide trim materials shall be specified for sales gasand fuel gas containing the so-called "black powder".

6.6.6 Monel, nickel, titanium or Hastelloy trim materials are recommendedfor corrosive type services to ensure acceptable service life.

6.6.7 Trim design shall be suitable to withstand the specified shut-off pressure drop condition.

6.6.8 Seat leakage shall meet the ANSI/FCI 70-2 class specified on the ISS.6.7 Packing System

6.7.1 General

Control valve manufacturer shall provide packing systems toeffectively maintain minimum leakage and travel performance withinthe inaccuracy limits specified in paragraph 6.9.2. If necessary,oversized actuators shall be used.

The manufacturer is responsible for the quality and performance of the

packing system for the process fluid conditions specified on the ISS. Asafety margin of 15C shall be applied on the manufacturer's upper andlower temperature limits to cater for abnormal operations outside thespecified temperature conditions.

6.7.2 Use of elastomer packing such as PTFE or glass filled TFE shall belimited to 230C (450F) service temperature. Above 230C, graphite
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compound type packing materials or manufacturer's recommended packing shall be used.

6.7.3 Packing systems shall not require lubrication. Asbestos materials shallnot be used. Coiled packing and split-ring packing systems shall not

be used for new control valves.

The use of sealing compounds is not acceptable.

6.7.4 Packing gland studs and nuts shall facilitate precise adjustments of the packing load.

6.7.5 Corrosion resistant alloy materials compatible with the process fluidshall be used for the gland studs and nuts, packing follower and

packing flange (i.e., carbon steel is not acceptable).

6.7.6 Low Emission Packing

Low Emission Packing (LEP) designed to reduce fugitive emissionsshall be supplied when specified on the ISS for applications includingVOC services and components that are in Hazardous Air Pollutantservice (e.g., including benzene, toluene and xylene).

6.7.7 The LEP shall limit the fugitive emissions of to a maximum of500 ppmv.

6.7.8 Bellows welded to both the bonnet and stem provided with a back-up packing system shall be supplied when specified on the ISS.

6.7.9 Stem and Extension Bonnet

Stem materials and sizes shall be selected to prevent corrosion, pitting,scoring and bending of the stem. Valve stems shall have a finish of0.1 micrometer Ra or less. Packing gland followers and/or bushingsshall be provided to maintain the stem precisely centered.

An extension bonnet or cooling fin may be provided when the packinglife can be increased or when the valve travel dead band can be

reduced. However, no extended temperature operating range shall beallowed for PTFE packing material. The manufacturer is responsiblefor selecting the quality and performance of the packing system for thespecified process fluid conditions.

Requirement for extended or finned bonnet shall be as specified on theISS.

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6.8 Sizing and Selection

6.8.1 The manufacturer is responsible for the valve flow capacity sizing,

noise calculations and actuator sizing. Control valve sizing shallgenerally be based on ISA 75.01.01 or IEC 60534-2-5 as applicable.

Manufacturer may deviate from the ISA and IEC formulas providedthat the reason and the formula used are detailed in the technicalquotation. Manufacturer to specify all applicable capacity calculationcorrection factors addressed in these standards (i.e., piping geometryfactor, F P, for valves mounted between pipe reducers or other pipefittings, calculated F LP and/or X TP factors, Reynolds number factor, F R ,etc., to be specified in the calculation or on the ISS). Manufacturershall provide capacity and noise calculations for all operating

conditions specified on the ISS.6.8.2 Control valve bodies with reduced trims shall be quoted as an

alternative for the following applications:

a) pressure drop applications in excess of 5170 kPa (750 psi);

b) choked flow services;

c) flashing services with downstream vapor content exceeding 10%weight;

d) erosive services;

e) services where future capacity increase is anticipated.

Body sizes 1-inch, 2-inch, 3-inch", 5-inch or higher odd numbersshall not be used.

6.8.3 Body outlet velocity, defined as the fluid velocity at the dischargeflange of a control valve, shall not exceed:

0.15 Mach for gas containing black powder

0.2 Mach for gas, vapor and steam services containing any particulate matter

0.3 Mach for wet gas, vapor and saturated steam services 0.4 Mach for dry clean gas and superheated steam services

0.5 Mach for dry clean gas in infrequent services (i.e., serviceswhere the control valves are operated for less than1 hour and closed for more than 7 hours during an8-hour shift)
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6.8.4 An equal percentage trim shall operate below 93% stem travel atmaximum flow condition.

A linear trim and quick opening trim shall operate below 90% stemtravel at maximum flow condition.

A modified parabolic trim shall operate below 90% stem travel atmaximum flow condition.

Exception:

Anti-surge control valves shall operate below 55% travel at any surgeflow condition.

Commentary Note:

The specified travel percentages apply to both linear and rotary controlvalves and need to be converted to degrees opening for rotary typecontrol valves.

6.8.5 The installed rangeability (i.e., the actual available rangeability) ofeach control valve in the process system shall meet all flow conditionsspecified on the ISS. The specified minimum flow condition shall befully controllable and shall operate above 10% travel for globe, angleand axial flow type control valves, 5 degrees for ball type controlvalves, and 10 degrees for butterfly, rotary plug/disc and cammed typecontrol valves.

Manufacturer's control valve characteristic shall conform toISA 75.11.01.

6.9 Positioners

6.9.1 General

The control valve manufacturer shall be responsible for packaging andguaranteeing the whole control valve assembly.

Each control valve shall be provided with a digital positioner, unlessotherwise specified. Type of positioner shall be as specified on the ISS.

For fast stroke speed requirements it is preferred to use a high aircapacity positioner rather than a positioner with booster(s). Therequired stroke time shall be met.

A double acting positioner shall be used for double acting typeactuators (e.g., a single acting positioner with a reversing relays shallnot be used).
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Positioners shall be electromagnetic compatible and be certified toIEC 61000-4-3, Level 3 (10 volts/meter).

Positioners shall be vibration resistant up to 0.75 inch/sec. RMSminimum and be tested conform to SAMA PCM 31.3.

Manufacturer shall test, record and submit control valve signatures, ortested hysteresis data in tabular form, as part of the documentationsubmittals, in soft copy format. Positioners shall be fully configuredwith all user information.

Following criteria apply for the subject positioners:

6.9.2 Digital Positioners

6.9.2.1 Foundation Fieldbus (FF) positioners shall:

have passed all tests of the latest Interoperability Test Kit(ITK) and accordingly be certified by FieldbusFoundation;

be field proven for at east one year;

have passed all function block tests with the host controlsystem and be certified by host control system vendor;

enable user to download function blocks to the positioner;

be capable to perform continuous diagnostic tests,including self-test functions, and to provide specificdiagnostic information at the Man-Machine-Interface(MMI);

include menu's and methods (wizards) to facilitate easyset-up and to enable calibration from the MMI;

be certified as Non-Incentive by FM or CSM forinstallation in a Class I, Division 2 (Zone 2) area;

store all configuration data in non-volatile memory (e.g.,no configuration data may be lost during a power loss).

6.9.2.2 HART positioner

A 2-wire loop powered 4-20 mA signal HART protocol smart positioners shall be locally configurable by push buttons anda HART handheld terminal and remotely by a HARThandheld terminal and thru the DCS.
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6.9.3 Analog Positioners

Conventional electro-pneumatic and pneumatic positioners, if

specified, shall be selected and guaranteed by the control valvemanufacturer.

6.10 Actuator System

6.10.1 Type of actuator shall be as specified on the ISS. The manufacturer isresponsible for correctly sizing the actuators based on this specificationand the ISS. Actuator systems shall be suitable for non-lubricated airor sweet gas as specified on the ISS. Actuators shall operate on thesignal specified on the ISS. Actuators shall develop sufficient force tooperate the valve against the shut-off pressure drop specified on theISS. Actuator force/torque requirements shall be determined for theworst case service requirements. If no shut-off pressure drop isspecified then the actuator sizing shall be based on the maximum inlet

pressure specified in the ISS with atmospheric pressure at the outlet.Actuator sizing shall be based on a minimum available instrument air

pressure of 415 kPag (60 psig), including worst-case requirements formaximum force/torque. Air supply design pressure conditions aregenerally 862 kPag (125 psig) at 82C.

6.10.2 Maximum inaccuracy of the valve travel position versus control signalshall be less than 1.5% for valves with a positioner and less than 2.5%for valves without a positioner.

6.10.3 Pneumatic tubing and fittings shall be AISI 316 stainless steelminimum. Carbon steel, copper, bronze, brass, and AISI 304 stainlesssteel materials shall not be used. Fittings shall be as specified on theISS, but be limited to Swagelok, Parker A-lock, Hy-Lok, Gyrolock,CPI or other equivalent manufacturer approved by Saudi Aramco. Theminimum Size of pneumatic connectors, fittings, unions and nipplesshall be 0.25 inch NPT provided that the stroke speed requirements aremet. Teflon ribbon shall not be used for sealing threaded connections.All vents shall be directed downwards to prevent ingress of dust andsand.

All control valves shall be provided with a suitably sized air filterregulator set.

6.10.4 When the air failure open (AFO) or air failure close (AFC) actionmode of a single or double piston-operated actuator system can not beaccomplished due to insufficient spring force then a volume tank withfail-safe trip valves shall be provided. The specified air failure mode

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movement of the control valve shall be prompt in the event of eithercontrol signal failure or air supply failure. The tripping pressure shall

be 350 kPa (50 psig) and normal valve operation shall be automatic onrestoration of air supply pressure. The required air failure mode shall

be accomplished without the aid of process pressure. Air failuremodes shall be testable during inspection and during plantcommissioning when piping systems are de-pressurized.

6.10.5 When an air failure lock (AFL) action mode is required, also referredto as "air failure steady" (AFS), lock-up valves shall be provided tomaintain the actuator in the last operating position.

6.10.6 Actuators shall meet the control stroke time specified on the ISS for allspecified operating conditions (e.g., stroke time in modulating modes of

operation). Boosters may be applied, as required but stroke movementsshall remain stable at 20%, 50% and 80% control signal step changes(i.e., overshoot to be less than 120% of the input step change and bedampening) as defined in ANSI/ISA 51.1 and addressed in ANSI/ISATR75.25.02. Overshoot shall be less than 110% for compressor Anti-Surge applications. Stroke times shall be met on a 50% control signalstep change (i.e., the resulting 50% stroke change needs to be performedwithin 50% of the total stroke time specified on the ISS).

7.10.7 When specified on the ISS, actuator shall also meet the air failuremode stroke time. Quick-exhaust valves commonly used to meet thisrequirement shall not interfere with the normal control operation of theactuator.

6.10.8 Connection of the shaft or stem to the actuator linkages shall beadjustable with positive locking and be of an anti-rotating type.

6.10.9 Actuator springs shall be minimum of carbon steel with manufacturer'sstandard factory applied corrosion resistant coating or hot oil dipping,unless other wise specified in the P.O.

6.10.10 Materials of actuator cylinders and diaphragm cases shall be steel, castiron or copper free aluminum (i.e., non-metallic, epoxy or fiber glass

type materials are not acceptable). For emergency de-pressurizingcontrol valves only steel or cast iron cylinder type actuator systems areallowed to be used.

6.11 Accessories

6.11.1 Manufacturer shall supply the accessories specified on the ISS andPurchase Order. Accessories shall be installed on the control valve and
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actuator assembly. Accessories shall operate from the power supplyspecified on the ISS or Purchase Order. Enclosures of accessories and

junction boxes shall be die-cast aluminum copper free max. 0.4%, tomeet minimum NEMA 4X or IP 65 (IEC 60529) weather proof andshall be certified for Class I, Division 2 (Zone 2) installations.

6.11.2 The pneumatic positioner and I/P transducer shall be supplied from thesame air supply connection. A 5 micron air supply filter shall besupplied for each control valve. A large capacity regulator, capable to

provide a constant pressure under all operating conditions, shall be provided.

6.11.3 Positioners shall be provided with gauges to indicate the air supply andsignal pressures and positioner pneumatic output. For a double acting

actuators both top and bottom pressure gauges should be provided onthe positioner.

6.11.4 A positioner bypass valve shall only be provided for direct acting positioners with a 3-15 psig pneumatic signal output to spring-loadedactuators (e.g., only when the input signal range is the same as thevalve positioner output range). A bypass valve shall not be installed onreversed- or reversible-type positioners.

6.11.5 If a handwheel is specified on the ISS, manual operation of thehandwheel shall override automatic operation. Handwheel mechanismshall not add significant friction to the actuator. The handwheeloperation shall be clockwise to close the valve and anti-clockwise toopen the valve. Handwheel shall not be used as mechanical travelstop. The neutral position shall be clearly indicated.

6.11.6 Discrete limit switch shall be of the mechanical, proximity or magneticsensor type, as specified on the ISS. Limit switch enclosures shall behermetically sealed. Switch contact outputs shall be minimum, Single-Pole, Double-Throw (SPDT). Contact rating shall be minimum,0.5 Amp inductive @ 125 VDC and 2 Amp resistive @ 120 VACunless otherwise specified in the Purchase Order.

6.11.7 A solenoid valve shall move the valve to the fail-safe position whende-energized. Solenoid valves shall be certified to Class I, Division 2(Zone 2). The solenoid valve shall have Viton internal soft parts. Theminimum solenoid valve size shall be 0.25 inches. Solenoid operatedvalves shall have class H insulation, stainless steel body and beselected from the manufacturers specified on the ISS or PurchaseOrder. Provided the solenoid valve meets ambient temperature
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requirements, Class F coil insulation may also be used in low power applications, i.e., 24 volts.

6.11.8 Volume tanks shall be mechanically designed to withstand a maximum pressure of 930 kPag (135 psig) at 82C. Volume tanks shall bemanufactured in accordance with ASME SEC VIII D1 (stamped UM)or PED requirements. Volume tanks shall have a minimum capacityfor two complete strokes of the control valve at the minimum availableinstrument air pressure of 415 kPag (60 psig). The I/P transducer shallalso be supplied from this volume tank.

6.11.9 Travel stop adjustment must be lockable or be equipped with a jam-nutarrangement. Travel stop arrangements through the hand wheelmechanism are not acceptable.

6.11.10 Each control valve shall be provided with a valve position indicator.The indicating pointer shall be directly connected to the stem or shaft.The valve position shall be indicated on a reversible scale, with clearlygraduated markings at the 25, 50 and 75% valve opening position andthe words OPEN and CLOSED at the valve travel limits.

6.11.11 Requirement for analog valve travel position transmitter shall be asspecified on the ISS. The total maximum inaccuracy of the signalversus travel position due to any limitation shall be less than 1.5%.

7 Noise Level Requirements

The maximum noise level emission from each control valve measured 1 m downstream ofthe valve and 1 m away from the valve shall not exceed the limit specified in SAES-J-700and the ISS under any specified operating condition.

The maximum noise levels are specified in terms of equivalent continuous A-weightedSound Pressure Levels (SPL) with a maximum inaccuracy of + 5 dB(A). Manufacturersshall include inaccuracies of their quoted noise levels and shall guarantee that the noiseemission from control valves shall not exceed the specified limit for any specifiedoperating condition.

Manufacturer shall provide a noise calculation, including the maximum inaccuracy, foreach specified operating condition.

Manufacturer shall include noise reduction proposal(s) for any calculated noise levelexceeding 85 dB(A).
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8 Marking and Name Plate

8.1 The direction of flow shall be marked on the valve body for all valves which

have been designed or selected for a specific flow direction. Marking shallnormally be cast or steel stamped. Alternative marking may be accomplished bya stainless label permanently fixed to the body by rivets.

The trim position of rotary valves shall be engraved on the shaft end.

8.2 A permanently fastened stainless steel name plate shall be provided on eachcontrol valve (e.g., by stainless steel rivets) with the following information:

Tag number specified on the ISS;

Manufacturers name, model number and valve serial number;

Body material, valve size and flange rating;

Trim material;

Actuator model, size and bench set.

9 Painting

Finish, priming and painting of the control valve and accessories may be as per themanufacturer's standard provided that the coatings are suitable for the environmentalconditions and can be maintenance coated.

10 Documentation

Following documentation shall be provided:

Documents to be submitted with the quotation covered by the Purchase Order;

Documents covered by Form NMR-7925 Non-Material Requirements (NMR) forValves - All Types;

Documents covered by the applicable inspection requirements.

11 Inspection and Testing Requirements

11.1 General

Manufacturer is responsible for ensuring conformance to the applicablespecifications and standards and for demonstrating this to the Contractor andSaudi Aramco inspection representatives.
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As part of their QA program, Manufacturer shall implement a qualification procedure for all pressure containing steel castings. As a minimum, themanufacturer shall have qualified each foundry's casting patterns byradiographic or other NDE examination of the initial casting. Records of thesequalifications shall be made available upon request.

For Capital Projects, Manufacturer shall propose an inspection and testing planand schedule (ITPS) for each control valve order. The manufacturer may usehis own ITPS format provided that all Saudi Aramco requirements are included.

11.2 Visual Inspection

All castings shall be visually inspected in accordance with MSS SP-55. Acasting shall be rejected if any surface irregularity exceeds example b forGeneral Service valves or example a for Non-General Service valves of anydefect type as per MSS SP-55.

11.3 Inspection and Testing Forms

The following inspection and testing requirements apply to this specification:

SA Form 175-340100 for General Service Control Valves

SA Form 175-340150 for Non-General Service Control Valves

11.4 Specific Tests and Procedures

Proposed repair method of major weld repairs shall be approved by Company prior to welding. Welds shall be 100% radiographed and evaluated inaccordance with of the applicable ANSI/ASME standard with a minimumcasting quality factor of 0.95.

11.4.1 Positive Material Identification (PMI) Requirements

Positive Material Identification (PMI) shall be performed on alloy steelmaterial control valves. PMI shall be performed in accordance withSAES-A-206.

PMI alloy verification is required on body and bonnet materials(100%). Alloy verification for trim parts is not required unlessspecified in the purchase order.

11.4.2 Post Weld Heat Treatment

Castings and test bars shall be heat treated together. For carbon steel,the Brinnel hardness of heat-treated castings shall not exceed 225.
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11.4.3 Non-Destructive Testing

When required by the applicable 175 Form, critical body and bonnet

casting sections, typically defined by ASME B16.34, shall beradiographed and shall meet ASTM E446 (up to 2 inches thick). NDEof pressure retaining parts shall be completed before machining.

11.4.4 Hydrostatic Testing

Hydrostatic shell testing shall be performed at factory after assemblyof the control valve as per ISA 75.19.01. The water shall contain acorrosion inhibitor.

11.4.5 Leakage Tests

Leakage test shall be based on ANSI/FCI 70-2. The water shallcontain a corrosion inhibitor.

11.4.6 Mechanical Operation Test

Mechanical operation tests shall be performed with the packing systemtightened under the same load as during the hydrostatic test. The valvestem may not be lubricated.

The test shall consist of measuring the valve stem position forincreasing and decreasing input signals at every 10% travel interval.The manufacturer shall demonstrate that the maximum acceptableinaccuracy levels will not be exceeded.

If a handwheel is specified then the fully open and closed positions ofthe valve need to be achieved with handwheel operation taking overfrom actuator at mid-position.

Stroking speed in control mode shall meet the ISS.

11.4.7 Impact Tests

Charpy impact testing at the design temperature shall be performed on

the body and bonnet materials for services below -46C.11.4.8 Fire Tests

Certified Fire Tests Report shall be provided for each type of controlvalve specified to be fire -safe. Packing systems of fire proof control valves shall meet API STD 607 fire test leakage performancerequirements.
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11.4.9 Certificates

Manufacturer shall issue material certificates and certified test reports

as specified on the appropriate SA Form 175 or P.O.

11.4.10 Storage

Control valves shall be stored in an enclosed building that provides protection from blown dust, mud and rain, etc. The Contractor isresponsible for any damage or malfunctioning due to inadequatestorage of the control valves.

12 Requirements for Shipment

All machined or threaded surfaces subject to atmospheric corrosion during shipment, orsubsequent outdoor storage, shall be treated with an easily removable rust preventive.Flange protectors shall fully cover the gasket contact surfaces. Pneumatic tubingsystems shall be adequately protected to prevent any damage during shipment.Pneumatic end connections shall be sealed or closed by a plastic plug or PVC tape.

Revision Summary4 May 2008 Major revision.9 September 2008 Minor revision to delete the mandatory requirement of the drain provision and plug for

control valve bodies.26 January 2009 Editorial revision to delete the reference to ATEX as a certifying agency for electrical

equipment to be used in classified areas.

34-SAMSS-711 01262009

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Transcript of 34-SAMSS-711 01262009