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Transcript of PDVSA k-302
PDVSA N° TITLE
REV. DATE DESCRIPTION PAG. REV. APPD. APPD.
APPD.BY DATEDATE
VOLUME 9–I
�1994
K–302 FLOW INSTRUMENTATION
FOR APPROVAL
Eliecer Jiménez Alejandro NewskiAUG.94 AUG.94
ENGINEERING SPECIFICATION
AUG.94 L.T.0 32 E.J. A.N.
ENGINEERING DESIGN MANUAL
ESPECIALISTAS
APPD.BY
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REVISION DATE
ENGINEERING SPECIFICATION
FLOW INSTRUMENTATIONPage 1
AUG.940
PDVSA K–302
Menú Principal Indice manual Indice volumen Indice norma
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Index
Page
1 SCOPE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 CODES, STANDARDS AND PRACTICES 3. . . . . . . . . . . . . . . . . . . .
3 DEFINITIONS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 GENERAL REQUIREMENTS 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 ORIFICE PLATES 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 Standard orifice plates (Ref. Fig. 2) 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Non–Standard Orifice Bores 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3 Line Size Limitations 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4 Materials 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 Design Considerations (Ref. Fig. 2) 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 ORIFICE FLANGES 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.1 Raised Face Orifice Flanges 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Ring type joint orifice flanges and carrier rings 20. . . . . . . . . . . . . . . . . . . . . . 6.3 Carrier rings 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 Pressure Taps 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 Gaskets 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 Marking 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 PREFABRICATED METER RUNS 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1 Orifice meter run sizes 11/2 inches and below 24. . . . . . . . . . . . . . . . . . . . . . 7.2 Orifice meter run for line sizes 2 to 12 inches 25. . . . . . . . . . . . . . . . . . . . . . . 7.3 Orifice meter run for sizes 2” to 12” 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4 Integral orifice d/p cell assembly 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 NOZZLES AND VENTURI TUBES 26. . . . . . . . . . . . . . . . . . . . . . . . . . .
9 RESTRICTION ORIFICES 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10 PRIMARY ELEMENT CALCULATIONS FOR DIFFERENTIALPRESSURE TYPE DEVICES 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11 OTHER PRIMARY ELEMENT DEVICES 28. . . . . . . . . . . . . . . . . . . . . .
12 FLOW INSTRUMENTS 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13 SPECIFICATION FORMS 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14 INSTALLATION AND COMMISSIONING 29. . . . . . . . . . . . . . . . . . . . . .
15 Q.A. / Q.C. 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REVISION DATE
ENGINEERING SPECIFICATION
FLOW INSTRUMENTATIONPage 2
AUG.940
PDVSA K–302
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FOREWORD
This document is the result of several years’ work by engineers in the petroleum industryof Venezuela (PDVSA).
The recommendations presented in this publication are not intended to supersedeapplicable laws and regulations.
Users of this recommended practice are reminded that no publication of this type can becomplete, nor, can any written document, be substituted for qualifed engineering analysis.
Suggested revisions are invited and should be submitted to:
The manager
PDVSA Engineering Standards,
C/O INTEVEP – TENA División,
Apartado 76343
Caracas – 1070A
Venezuela
REVISION DATE
ENGINEERING SPECIFICATION
FLOW INSTRUMENTATIONPage 3
AUG.940
PDVSA K–302
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1 SCOPE
This section covers PDVSA requirements for the design, specification, installationand commissioning of flow instrumentation. All guidelines of the introductionspecification K–300 shall also be explicitly followed.
2 CODES, STANDARDS AND PRACTICESA.G.A. reports 3 to 8I.S.O. 5167 and 5168A.P.I. MPMS – 5.1 to 5.5 – 87/82A.P.I. RP–550 Section 1ANSI B 46.1ANSI/API 2530ANSI B 16.36BS–1042NACE–MR 0175FLOW MEASUREMENT ENGINEERING HANDBOOK by R.W. MILLERSHELL FLOW METER ENGINEERING HANDBOOK 2nd EDITION 1985
(McGRAW–HILL PUBLICATION)
3 DEFINITIONS
All definitions are listed in specification K–300.
REVISION DATE
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4 GENERAL REQUIREMENTS4.1 Each flow meter application shall be reviewed carefully and the required
measurement accuracies shall be classified as listed below during the designstage.
The system includes primary element such as an orifice plate or turbine or positivedisplacement meter, a local readout device or transmitter and necessarypressure, temperature and component analysis measurements to correct theprimary element reading for varying physical parameters. The error figure citedincludes error of each individual component in the system.
This specification covers fluid flow measurement in pipes only. For open channelmeasurement the standards referred to in “the flow measurement engineeringhandbook by R.W. Miller” shall be consulted and the proposed method agreedwith PDVSA.
Measurement classification Maximum system error
1 LESS THAN 1.0%
2 LESS THAN 2.0%
3 > 2.0%
All measurements of fluids to and from a plant at its battery limit and all custodytransfer meters shall be class 1 designed in accordance with I.S.O.–5167 and/orANSI/API–2530 and/or ANSI/API MPMS 5.1–5.5.
All other measurements are class 3 except those identified as class 2 by processengineers in order to perform efficiency calculations of process plant or rotatingequipment.
4.2 Tables 1 and 2 on pages 5 and 6 list various types of primary elements, their typicalapplications and relative cost indication. This standard deals essentialy withorifice plate and differential pressure producing type primary elements.
4.3 Other flow elements and devices such as venturi (standard or low–loss),nozzle,pitot tube, annubar, turbine meter, vortex meter, positive displacement meter,magnetic flow meter, mass flow meter, rotameters, insertion type–turbine, hotwire, etc... shall be selected to meet particular service conditions such as lowpressure drop, high metering accuracy, flow in small or very large bore piping,ducts, underwater, etc. The meter size selected shall ensure linearity of themeasurement within the required accuracy limits to suit the minimum specifiedoperational flow rates. All such applications shall be discussed with and approvedby PDVSA. Also see paragraph 11.
REVISION DATE
ENGINEERING SPECIFICATION
FLOW INSTRUMENTATIONPage 5
AUG.940
PDVSA K–302
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TABLE 1.
FLOW METER SELECTION TABLE. SQUARE SCALE, RANGEABILITY 4:1
E
C
I
F
I
R
O
L – LOWM – MEDIUMH – HIGHBLANK – NOT RECOMMENDED
B – LIMITED APPLICATIONA – RECOMMENDED
SLURRY
BBABBAB
BBBBAA
BBAA
BBA
B
BBB
BBB BB
A
A
A
B
B
A
A
A
B
B
A
A
A
A
A
A
B
B
A
A
B
B
BB
B
B
BB
B
AA
A
A
A
A
A
A
A
A
LLM H
LML L
LMM L
LL M L
LHH L
LMM M
LHH L
HL M M
HMLL
MML H
HL M M
L L M H
HMML
600 450
>10000
>10000
>10000
>75000
>10000
>10000
>10000
NOLIMIT
>500
>200
>100
>1000
>2000
5 %
5 %
3 %
5 %
2 %
2 %
2 %
3 %
3 %
3 %
3 %
2 %
1 %
>1
>2
>3
>3
>1
>2
>2
>4
>2
>2
<1/2
1 1/21/2 TO
>2
FLOW METER
MAX. MAX.
COSTGASES LIQUIDS
WEDGE
ELBOW
MULTI–PORT
SEGMENTAL
VENTURI
FLOW NOZZLE
LO–LOSS
PITOT
ECCENTRIC
QUADRANT
INTEGRAL
HONED METER RUN
SQUARE EDGED
LIN
E S
IZE
INS
.
AC
CU
RA
CY
CLE
AN
DIR
TY
CO
RR
OS
IVE
ST
EA
M
AB
RA
SIV
E
DIR
TY
FIB
RO
US P
RE
SS
.
TE
MP.
C
VIS
CO
US
°
RE
YN
OLD
’SN
UM
BE
R
EQ
UIP
ME
NT
(RE
LAT
IVE
)KG
/CM
CLE
AN
PR
ES
SU
RE
LO
SS
INS
TALL
AT
ION
2
MA
INT
EN
AN
CE
REVISION DATE
ENGINEERING SPECIFICATION
FLOW INSTRUMENTATIONPage 6
AUG.940
PDVSA K–302
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TABLE 2.
FLOW METER SELECTION TABLE. LINEAR SCALE, RANGEABILITY 10:1
TO HIGHLYVISCOUSLIQUIDS
IDEM
LIMITNO
CST<20
CST<8000
LIMITNO
NO
400 100
PIPE
IDEM200
350500
RATING300
100200
150300
100300
200300
B
A
AAAAB
BA
B
B
AAA
A
A
A
A
A
DISPLACEMENT
B
B
A
A
BA
A
A
BA
A
A
A
A
A
MLM L
LLM M
MMM L
LM M M
HHHH
HH H H
H H M M
LMHH
>10000
LIMIT
2%
2%
5%
5%
1%
1%
1%
3%
>3
>6
>1
>1
24
12
72UPTO
TIME OF FLIGHT
DOPPLER
VARIABLE AREA
VORTEX
TURBINE
POSITIVE
MASS (CORIOLIS)
MAGNETIC
FLOW METER
GASES LIQUIDS
LIN
E S
IZE
INS
.
AC
CU
RA
CY
CLE
AN
DIR
TY
CO
RR
OS
IVE
ST
EA
M
DIR
TY
FIB
RO
US
VIS
CO
US
CLE
AN
SLURRY
MAX. MAX.
COST
AB
RA
SIV
E PR
ES
S.
TE
MP.
C°
RE
YN
OLD
’S
NU
MB
ER
EQ
UIP
ME
NT
(RE
LAT
IVE
)KG
/CM
INS
TALL
AT
ION
2
MA
INT
EN
AN
CE
PR
ES
SU
RE
LO
SS
ULT
RA
SO
NIC
L – LOWM – MEDIUMH – HIGHBLANK – NOT RECOMMENDED
B – LIMITED APPLICATIONA – RECOMMENDED
REVISION DATE
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FIGURE 1
FLOW
EDGE
UPSTREAM
BEVEL
ANGLE OF
CALCULATEDORIFICE
DIAMETER
DIAMETERPIPE
INSIDE
AND
DOWNSTREAM EDGES
AXIAL CENTRE–LINE
THICKNESS OF THE ORIFICE
DOWNSTREAM FACEUPSTREAM FACE
THICKNESS OF THE PLATE
STANDARD ORIFICE PLATE
T
F
H I
G
e
D d
0 0
REVISION DATE
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4.4 Flow metering runs shall be supplied complete with prefabricated meter runs inaccordance with details in paragraphs 7 and 14.
4.5 The use of flow straightners shall be discussed with and approved by PDVSA. Thefinally selected item shall conform with I.S.O.–5167, section 6.3.
5 ORIFICE PLATES
5.1 Standard Orifice Plates (Ref. Fig. 2)
5.1.1 Plate type
Standard type orifice plates referred to in this document are flat circular plates ofuniform thickness, with a concentric hole (orifice). The hole is either square edgedon the upstream and downstream faces or with a 45 degree bevel on thedownstream edge, depending on the thickness of the plate.
Orifice plates may be of the Paddle or Slip type (circular with a tab or handle) foruse in orifice flanges, or Universal, for use in orifice fittings, carrier or ring type jointplate holders.
5.1.2 Orifice diameter
– The orifice diameter (d) is dependent on the particular application and shall bedetermined by calculation based on ISO 5167. Orifice sizing calculation andprogram shall be subject to PDVSA approval. Also see paragraph 10.0.
– For applications where the highest accuracy is required, the orifice diametershall be calculated so that maximum d/D ratio does not exceed 0.6. This willensure that the flow coefficient uncertainty is 0.6%.
– For β �
dD
ratios higher than 0.6, the % uncertainty is equal to the beta ratio.For less demanding lower accuracy applications, the d/D ratio shall not exceed0.7. The minimum d/D shall be 0.3.
5.1.3 Tolerance on specified orifice diameter
The orifice diameter shall be machined or ground to within + 0.01d (for d < 50 mm)or + 0.05 mm (for d > 50 mm) of the specified diameter determined in 5.5.5 above.The orifice bore shall be truly at right angles to the face of the plate. For highestaccuracy measurement the actual orifice diameter shall be measured inaccordance with ISO 5167 Section 7.1.7.2.
REVISION DATE
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FLOW INSTRUMENTATIONPage 9
AUG.940
PDVSA K–302
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�
W
17
15
SEE DETAIL ‘1’ FOR
PLATE FLATNESS
DETAIL ‘1’
UNIVERSAL ORIFICE PLATE
WHEREAPPLICABLE
APPLICABLE
(WHERE APPLICABLE)
HOLE DIA ‘Y’
FLATNESS L
NOT TO EXCEED
0.01 L AT ANY POINT
UNDER FLOW CONDITIONS
L
PLATE SURFACE
ANY PART OF
STRAIGHT EDGE
WHERE
��������
T THICKNESS
EDGE GUPSTREAM
H & I
DOWNSTREAM EDGES
DOWNSTREAM FACE
DOWNSTREAM FACE
d
45
45
d
e
e
FIGURE 2
d
d
A
B
C
PADDLE TYPE ORIFICE PLATE
STANDARD ORIFICE PLATES
LC
CL
CL
LC
FIGURE 2
AN
Y C
HO
RD
L
°
REVISION DATE
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AUG.940
PDVSA K–302
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5.2 Non–Standard Orifice Bores
5.2.1 Other types of non–standard plates with special orifice bores such as segmental,eccentric, and quarter round bores can be used to meet the specific application.The field of application consist of viscous fluids, dirty fluids, two phase flow,entrained solids in liquid or gas flow stream. The error is 50% greater than thefigures listed for a standard concentric bore orifice plate.
a. Quadrant–Edged Orifice – The quadrant or quarter circle bore is an orifice wherethe inlet edge is rounded. The radius of the quarter circle bore is a function of thebeta ratio. This bore is specially designed for fluids of high viscosity and lowReynolds number such as heavy crudes, syrups and slurries. The key factors arecritical manufacturing dimensions and lower accuracy.
b. Conical Entrance Orifice – The quarter circle of the quadrant is replaced by aconical entrance and is more difficult to manufacture than the quadrant.Applications are similar to the above for use on viscous fluids with a very lowReynolds number.
c. Eccentric and Segmental Orifice – These orifices were developed to meter liquidscontaining sediment and gases entrained within liquids. Both the segment and theeccentric orifice are inscribed in a circle which is 98% of the pipe diameter.Construction materials, plate thickness, edge sharpness, etc. are identical tothose for the square edged concentric orifice. Sizing and flow equations are thesame as for other differential producers. The segmental orifice allows drainageof foreign material at the side of the pipe where the opening is located to a greaterextent than the eccentric orifice. This Characteristic makes it useful for measuringwet steam, liquids containing granular solids and oils containing water. For liquidscontaining gas or vapour the segment may be located at the top of the pipe.However, for these fluids, a concentric orifice located in a vertical pipe with upwardflow would be preferred for greater accuracy. In all other respects the eccentricorifice is superior to the segmental orifice.
5.3 Line Size LimitationsISO 5167 is applicable for line sizes 50 mm (2 in.) to 1200 mm (24 in.). Therecommendations of BS–1042 shall be followed for metering in line sizes 1 1/2inches and below. The metering section shall consist of a meter run and an orificeplate. The meter run and the orifice plate shall be procured as one complete unitand calibrated in a N.B.S. (now N.I.S.T.) approved flow laboratory and a calibrationcurve obtained for the assembly. See paragraph 7.1 for additional details.
REVISION DATE
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5.4 MaterialsThe orifice plate material shall be compatible with the process fluid. The preferredmaterial is type 316 austenitic stainless steel. Type 304 stainless steel, Monel,Hastelloy or any other material shall be used to resist the fluid corrosion anderosion properties.
5.5 Design Considerations (Ref. Fig. 2)The following design considerations apply to both paddle type and universalplates unless otherwise specified.
5.5.1 Plate thickness
The thickness of the orifice plate (T) shall be in accordance with ISO 5167 Section7.1.4, viz. between e and 0.05D, where D is the internal diameter of the line takingnote of the fact that the minimum plate thickness as per ASME 1971 is as follows:
PIPE DIAMETER MINIMUM PLATE THICKNESS IN INCHES FOR DIFFERENTIAL PRESSURE IN INCHES OF WATER
Inches 100” 200” 201–1000”
6” and below 0.125 0.125 0.125
8” and 10” 0.125 0.125 0.25
12” to 20” 0.25 0.25 0.375
> 24” 0.375 0.375 0.5
For systems with differential pressure up to 200 inches W.G., the thickness of theplate shall not be less than 0.0156D, where D is the internal diameter of the line,in order to prevent plastic buckling and elastic deformation in excess of thatallowed in ISO 5167 Section 7.1.1.3.
For systems with differential pressure greater than 201 inches W.G. the platethickness shall not be less than 0.02D.
See paragraph 5.5.3 for dimensions in metric units.
REVISION DATE
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5.5.2 Orifice edge thickness
For plate thickness up to 0.02D the orifice edge thickness (e) shall be equal to T.For plate thickness greater than 0.02D, the downstream edge of the plate shall bebevelled at 45° to achieve an edged thickness of 0.02D. See paragraph 5.5.3 fordimensions in metric units.
LINE SIZEORIFICE EDGE THICKNESS (e) – INCHES
LINE SIZE
‘D’ FOR ORIFICE PLATE THICKNESS – INCHESINCHES
0.125 (1/8”) 0.25 (1/4”) 0.375 (3/8”) 0.5 (1/2”)
2 0.04 N/A N/A N/A
3 0.06 N/A N/A N/A
4 0.06 N/A N/A N/A
6 0.06 N/A N/A N/A
8 No Bevel* 0.138 N/A N/A
10 No Bevel* 0.138 N/A N/A
12 0.138 0.138 N/A
14 No Bevel* 0.236 N/A
16 No Bevel* 0.236 N/A
18 No Bevel* 0.315 0.315
20 No Bevel* 0.315 0.315
24 N/A No Bevel* 0.394
* Use of orifice plate with no bevel is not recommended except for the applicationwhere the plate measures flow in both directions. However in these cases thesurface finish on both sides shall conform with paragraph 5.5.4.
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5.5.3 Orifice plate and orifice edge thicknesses (metric units)
Orifice plate and orifice edge thicknesses in paragraph Nos. 5.5.1 and 5.5.2 arein english units. The recommended dimensions in metric units are as follows:
Line size ‘D’ Orifice plate Orifice edge‘T’ ‘e’
Inches MMs. Thickness (MMs.) Thickness (MMs.)
1/2 15 1.5 0.24
3/4 20 1.5 0.34
1 25 1.5 0.42
1 1/2 40 1.5 0.64
2 50 2.0 1.0
3 80 2.5 1.5
4 100 3.0 1.5
6 150 4.0 1.5
8 200 6.0 3.5
10 250 6.0 3.5
12 300 7.0 3.5
14 350 9.0 6.0
16 400 9.0 6.0
18 450 12.0 8.0
20 500 12.0 8.0
24 600 16.0 10.0
5.5.4 Surface finish
– The upstream surface finish shall in accordance with ISO 5167 have aroughness criterion Ra < 0.0001d, where d is the orifice bore dimension. Fornewly manufactured plates Ra shall be < 0.8 micrometres, in accordance withANSI B46.1.
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5.5.5 Outside diameter of plate – paddle type orifice plate
– For the paddle type orifice plate, the outside diameter of the plate (dimensionA) shall be machined to provide an uniformly circular disc and the dimensionsshall be in accordance with the values shown in Table below to a tolerance of± 0.00 in. and –0.016 in.
TABLE 3.ALL DIMENSIONS ARE GIVEN IN INCHES TO CORRESPOND
WITH ANSI B16.36 SERIES
SIZE OF PIPE ANSI B16.36
NPS
(ins.)
DN
(mm)
Class 300
A
Class 600
A
Class 900
A
B C
1 25 2.875 2.875 3.125 4 1.0
1.5 40 3.750 3.750 3.875 4 1.0
2 50 4.375 4.375 5.625 4 1.0
2.5 65 5.125 5.125 6.500 4 1.25
3 80 5.875 5.875 6.625 4 1.25
4 100 7.125 7.625 8.125 4 1.25
6 150 9.875 10.500 11.375 5 1.5
8 200 12.125 12.625 14.125 5 1.5
10 250 14.250 15.750 17.125 6 1.5
12 300 16.625 18.000 19.625 6 1.5
14 350 19.125 19.375 20.500 6 1.5
16 400 21.250 22.250 22.625 6 1.5
18 450 23.375 24.000 25.000 6 1.5
20 500 25.625 26.750 27.375 6 1.5
24 600 30.375 31.000 32.875 6 1.5
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5.5.6 Outside diameter of plate – universal orifice plate
For the universal (circular) orifice plate, dimensions are as per table below. Theseare typical values for guidance only which would be required to give concentricityin most proprietory orifice fittings. All dimensions are in inches.
TABLE 4.
Line
sizesPlate OD (A) Tolerance
1 1.312 +0.003 –0.003
1.5 2.000 +0.003 –0.003
2 2.437 +0.003 –0.003
2.5 2.812 +0.003 –0.003
3 3.437 +0.003 –0.003
4 4.406 +0.003 –0.003
6 6.437 +0.003 –0.006
8 8.437 +0.003 –0.006
10 10.687 +0.003 –0.006
12 12.593 +0.003 –0.006
14 14.000 +0.003 –0.008
16 16.000 +0.003 –0.008
18 18.000 +0.003 –0.008
20 20.000 +0.003 –0.008
24 24.000 +0.003 –0.012
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5.5.7 Drain and vent holes
– Where process conditions require the use of drain or vent holes they shall bein accordance with BS. 1042: Section 1.2: Part 3. The standard provides forthe use of these holes in line sizes greater than 4 inches only.
– Orifice plates with drain holes shall only be used in line sizes 100 mm (4 in.) orsmaller where it is essential to do so. The additional uncertainty in thedischarge coefficient arising from the use of a drain hole in these line sizes isnot quantified by the Standard.
– When installed, the plate should be positioned so that the drain hole is locatedat the lowest point on wet gas service and the highest point on liquid service withgas entrainment.
5.5.8 Orifice plate fabrication details
– Each and every new orifice plate shall be fabricated in accordance with detailson PDVSA drawing No. 1 and 2. The drawing No. 1 is in Spanish and drawingNo. 2 is in English. Copies of the drawings are included at the end of thisspecification.
The fabrication details shall be completed for each orifice plate in accordancewith the specific application requirement. The details in Tables 5 and 6 aid incompleting the dimensional data required on the drawing.
– The details of all existing orifice plates installed in the plant shall also betabulated on PDVSA drawing Nos. 1 and 2 and it is strongly suggested tofabricate a new replacement orifice plate in accordance with recommendationsas per this specification.
The details can be completed in either inches or millimetres. However it is stronglyrecommended to use the metric version only at the first available opportunity, forexample during fabrication of a replacement orifice plate.
The drawing can be used for either paddle type or universal type orifice plate.However if the installed plate is universal type, the word “universal” shall beindicated in bold large type letters on the drawing in order to facilitate easyidentification.
5.5.9 Marking
– For orifice plates with handles (paddle type), the orifice diameter, line size, platematerial, instrument tag number and the flange rating shall be stamped on theupstream face of the handle.
For the universal (circular) orifice plate, the orifice diameter, line size, platematerial, instrument tag number and the flange rating shall be stamped clearly onthe downstream face of the plate, as near to the outer edge as possible.
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TABLE 5. SQUARE EDGE ORIFICE DETAILS IN MMS
0.1mm
Nom. linesize
in.mm
50
200
150
100
80
300
400
350
250
600
500
450
190
155
165145
155
145
165
160
140
160
150
165
150
145 175
180
195
205
220
195
185
155
130
150
170
140
125
140
145
135
125
130
135
115
125
135
130
120
145
140
115
125
125
120
120
130
135
640.7
754.9
703.8
577.6
901.0
ANSI flange classANSI flange class
25001500600 900300
A 0.4 mm –+B 1 mm
45
30
50
60
40
3.5
8.0
6.0
10.0
1.5
1.0
12.0
9.0
6.0
16.0
7.0
4.0
3.0
2.5
2.0 51
109
208
164
84
261
315
356
406
456
508
610
–+ 1mm–+ 1mm–
+ 1mm–+ +–2%
Y
143.8
175.0
209.5
283.9
353.0
520.4
435.0
146.4
197.6
235.7
317.1
386.9
549.2
476.2
1.0
1.5
2.0
2.0
3.0
7.5
6.5
5.5
5.0
4.0
8.0
10.0
21.0
33.0
45.5
70.5
95.0
213.5
188.5
163.5
144.0
120.0
238.0
288.0
XWTeC
1mm–+25001500900600300
837.0
696.8
435.5
498.3
520.9
574.3
637.4
359.7
289.6
206.9
169.7
143.8
789.0
682.0
400.0
456.8
492.3
564.7
612.2
320.6
267.1
194.6
148.1
110.6110.6
148.1
180.0
251.8
308.3
596.3
539.5
485.0
422.2
361.8
653.1
774.024
20
10
12
14
16
18
8
6
4
3
2
–+
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TABLE 6. SQUARE EDGE ORIFICE DETAILS IN INCHES
0.04
0.06
0.08
0.08
0.12
0.16
0.2
0.2
0.26
0.3
0.32
0.4
0.8
1.3
2
3.3
1.8
2.8
4.3
6.5
3.8
4.8
8.2
10.3
5.7
6.5
12.5
14
7.5
8.5
16
18
9.4
11.3
20
241/20.394
0.315
0.315
3/8
3/8
0.236 3/8
3/80.236
3/80.138
1/40.138
1/40.138
1/8
1/8
1/8
0.06
0.06
0.06
1/80.04
+– 2% +– 1/64+– 1/64+– 1/64+– 1/64
Y
INCHES
5.625
6.875
8.250
11.125
13.875
20.500
17.125
5.750
7.750
9.250
12.500
15.250
21.625
18.750
INCHESSIZEPIPENOM.
1
1 1/4
1.25
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
4
4
4
5
5
6
6
6
6
6
6
6
+–
X
INCHES
W
INCHES
T
INCHES
e
INCHES
1/64
C
INCHESINCHES
B
1/64
+–A INCHES 1/64
2500 lb1500 lb900 lb600 lb300 lb
32.875
27.375
17.125
19.625
20.500
22.625
25.000
14.125
11.375
8.125
6.625
5.625
31.000
26.750
15.750
18.000
19.375
22.250
24.000
12.625
10.500
7.625
5.875
4.3754.375
5.875
7.125
9.875
12.125
23.375
21.250
19.125
16.625
14.250
25.625
30.37524
20
10
12
14
16
18
8
6
4
3
2
+–
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6 ORIFICE FLANGES
6.1 Raised Face Orifice FlangesRaised face orifice flanges referred to in this document are standard raised faceweld neck flanges for use with the paddle type orifice plates.
ORIFICE PLATE TAB
C
+.04 +.04
1”1”
1”
THICKNESS
DISTANCE TO ORIFICE PLATEPRESSURE TAP CENTRE
SURFACE INCLUDES GASKET
SOCKET WELD CONNECTIONFOR 1/2” NB PIPE
FIGURE 1
ORIFICE PLATE.FOR DETAILS SEE
THIN AS POSSIBLE
GASKET TO BE ASFLOW
STANDARD RAISED FACE ORIFICE FLANGES
‘ TT ‘‘ TT ‘
‘ TT ‘ TO BE 0.08D WITH MAXIMUM OF 0.5 INCH
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6.1.1 The design and selection shall be in accordance with the piping specification forthe particular line containing the orifice flange. The minimum rating shall be 300lbs. ANSI. The design shall be in accordance with ANSI B16.5, ANSI B16.36,ANSI B 46.1 and ISO 5167. The flange thickness shall not be less than 38 mm(1.5 in.). The flange bore shall be specified to match the internal diameter of thepiping schedule.
6.1.2 For line sizes of 50 mm (2 in.) and above the pressure tappings shall be flange typein accordance with ISO 5167 Section 7.2. For line sizes below 50 mm (2 in.) thepressure tapping shall be corner type in accordance with BS 1042:Section1.3:Paragraph 6.2.
6.1.3 Spreader bolts (jack screws) shall be provided in flanges, in diametricallyopposing positions. See “Shell Flow Metering Engineering Handbook 2 nd
Edition”, Figures 3.1.9 and 3.2.9 for additional details.
6.1.4 Inner surfaces at welds shall be ground to remove all burrs and to conform to ISO5167 Sections 6.1.8. and 6.5.1. Surface finish shall comply with ISO–5167specifications.
6.2 Ring Type Joint Orifice Flanges and Carrier Rings
6.2.1 Ring type joint orifice flanges referred to in this document are standard RTJ weldneck orifice flanges with “flange tap” pressure connections, for use with orificecarrier rings.
6.2.2 Ring type joint orifice flanges shall only be used on the following line sizes, inaccordance with ANSI B16.36:
Class 900: up to 300 mm (12 in.) NB
Class 1500: up to 150 mm (6 in.) NB
Class 2500: up to 75 mm (3 in.) NB.
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6.3 Carrier Rings
6.3.1 Carrier rings are designed to fit directly between ring type joint orifice flanges.They contain a removable square edged universal orifice plate and do not havepressure taps. They are designed with either octagonal or oval rings. Carrierdimensions shall be in accordance with ISO 5167 Section 7.2.4.
CARRIER RING
FLOW DIRECTION
ORIFICE PLATE
b) INDIVIDUAL TAPPINGS
AXIAL CENTER LINE
a
c c’
s
WITH ANNULAR SLOTa) CARRIER RING
PRESSURE TAPPINGS
CARRIER RING
g
a
b
c’
c
f :THICKNESS OF THE SLOT
:WIDTH OF THE ANNULAR SLOT
:DIAMETER OF THE RING
:LENGTH OF THE DOWNSTREAM RING
:LENGTH OF THE UPSTREAM RING
�
D d
b
0
0
0a
j
hf
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6.4 Pressure Taps
6.4.1 Pressure taps shall be in accordance with ISO 5167 Section 7.2.
PLATES WITH D AND D/2 OR FLANGE TAPPINGS
SPACING OF PRESSURE TAPPINGS FOR ORIFICE
OR FOR 0.6 BUT 150 mm D 760mm
OR FOR 0.6 BUT 50 mm D 58 mm
(25.4 1) mm FOR 0.6–+
+–(25.4 0.5) mm FOR 0.6 AND 58 mm D 150mm
FLANGE TAPPINGS
D AND D/2 PRESSURE TAPPINGS
0.5 D 0.01 D FOR 0.6–+
+–0.5 D 0.02 D FOR 0.6
�� ��������
DIRECTION OF FLOW 0 0
d D
> < <
> < <
> < <
<>
<
6.4.2 Two pairs of taps shall be provided for each orifice flange and each tap providedwith a plug.
6.4.3 For flanges and fittings below 50 mm (2 in.) nominal bore, corner taps shall beused. For pipe sizes 50 mm (2 in.) and above, flanges taps shall be used.
6.4.4 Pressure tap diameter shall be in accordance with ANSI B16.36, i.e:
12.7 mm (0.5 in.) for 100 mm (4 in.) NB and above
9.5 mm (0.375 in.) for 75 mm (3 in.) NB
6.3 mm (0.25 in.) below 75 mm (3 in.) NB.
6.4.5 Flange connections shall be threaded, seal, butt or socket welded as specified.For sour service, connections shall be in accordance with NACE STANDARD MR0175–90.
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6.4.6 Unused pressure taps shall be plugged and welded. For sour service, materials,welding, heat treatment shall be in accordance with NACE STANDARD MR0175–90.
6.5 Gaskets
6.5.1 The use of gaskets shall be in accordance with ISO 5167 Section 6.5.4.
6.5.2 The thickness of the gaskets shall, where compatible with the piping specification,be 1.5 mm, and in any case not greater than 0.03D where D is the line diameter.Where gaskets thicker than 1.5 mm are required, then the raised face of the orificeflange shall be suitably modified in accordance with ANSI B16.36 clause 7.1 note1, to meet the spacing requirements of the pressure tappings.
6.5.3 Gaskets shall not protrude at any point inside the pipe.
6.6 Marking
6.6.1 Flanges and carriers shall be marked with the letter “R” and the corresponding APIring groove number in accordance with ANSI B16.5 Table 5.
6.6.2 Material, line size and tag no. shall be stamped clearly on each unit.
7 PREFABRICATED METER RUNS
They consist of the following four types of assemblies three of which include anorifice assembly mounted between prefabricated and machined pipes and finallyone where the orifice is mounted within a d/p cell transmitter.
� Orifice meter run for line sizes 1/2 to 1 1/2 inches.
� Orifice meter run for line sizes 2 to 12 inches.
� Orifice meter run for line sizes 14 to 24 inches.
� Integral orifice d/p cell assembly.
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7.1 Orifice Meter Run Sizes 11/2 Inches and Below
7.1.1 They are used to measure small flows where the fluid temperature prohibits theuse of integral orifice assembly and also where the 5% error in measurementusing an integral orifice d/p cell is unacceptable.
7.1.2 Assemblies shall be in accordance with details in Figure below and calibrated ina N.B.S. approved flow laboratory.
7.1.3 Hydrostatic tests of the orifice assembly shall be carried out in accordance withANSI B31.3.
SHELL FLOW METER ENGINEERING HANDBOOK3.– FOR FABRICATION DETAILS SEE FIG. 10.1.9 OF
2408103/4”
ANNULAR GROOVENOTE:
THEN BORED AND HONEDTUBE ENDS, ASSEMBLED AND
THREADED OR FLANGED
1 in (25.4mm) 1 in (25.4mm)
FLANGE TAPS1 in (25.4mm) D 1.5 in (40mm)
0.15 0.7R 1000
CORNER TAPS
420
300
220
BA
480
770
11101 1/2”
1”
1/2”
LENGTH (MILLIMETRES)
SIZE
MEASURED AND USED IN FLOW CALCULATIONAFTER MANUFACTURE PIPE I.D. ACCURATELY2.–
: 1.– ANNULAR GROOVES FOR HIGH ACCURACY
: CORNER OR FLANGE
: SLIP ON OR WELD NECK
NOTES
TAPPINGS
FLANGES
TO SUIT PIPE RATINGEND CONNECTIONS
A B
0.5 in (12mm) D 1.5 in (40mm)
R 1000D
0.1 0.8>
< << <
>< << <
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7.2 Orifice Meter Run for Line Sizes 2 to 12 Inches
7.2.1 They are used for all Class 1 and Class 2 flow metering system applications.
7.2.2 The assembly shall be in accordance with details in Figure below.
7.2.3 All Class 1 units shall be procured from a fabricator meeting N.B.S. and ASMEstandards.
ARE DIAMETRICALLY OPPOSED.2) THE ORIFICE FLANGES SHALL BE FITTED IN SUCH A WAY THAT THE JACK SCREWS
STRAIGHT UPSTREAM LENGTH.1) THE UPSTREAM LENGTH OF THE ORIFICE METER RUN IS PART OF THE TOTALLY REQUIRED
NOTES:
14001050
700550350
21001750
3000225015001200
750
45003750
MILLIMETRES
L 2
INCHESSIZE
8
1210
NOMINAL PIPE L1
2346
ORIFICE FLANGE SET.LINE PIPEJACK SCREWSTUD BOLT WITH NUTTEMPORARY SPACERGASKET6
54321
DESCRIPTIONITEM
L1
UPSTREAM DOWNSTREAM
L2
������
�
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7.3 Orifice Meter Run for Sizes 2” to 12”
7.3.1 They are used for all Class 1 and Class 2 metering systems.
7.3.2 The assembly shall be in accordance with guidelines in “Shell flow meterengineering handbook”, Chapter 11.5.
7.4 Integral Orifice d/p Cell Assembly
7.4.1 They are used to measure small flows of very clean liquids or gases in line sizes1/2 inch and below.
7.4.2 The orifice is mounted integrally within the d/p cell and a N.B.S. approved flowlaboratory curve shall be supplied with each assembly.
7.4.3 The assembly shall be calibrated in a flow laboratory whenever the assembly isdismantled.
8 NOZZLES AND VENTURI TUBES
8.1 Flow nozzles shall be used for steam flow measurement and procured as acomplete unit with flanged ends.
8.2 Nozzles and Venturi Tubes shall only be used for applications where processconditions or requirements preclude the use of orifice plates. Where nozzles orventuri tubes are required, their design, installation and operation shall conformto ISO 5167 and A.P.I. RP–550.
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9 RESTRICTION ORIFICES
9.1 They are used to limit the maximum flow in a pipeline.
9.2 They shall be a standard square edge orifice with no bevel.
9.3 The calculation shall be based on a standard orifice with flange tappings. Seeshell flow meter engineering handbook, Chapter 10.3 for additional details.
10 PRIMARY ELEMENT CALCULATIONS FOR DIFFERENTIALPRESSURE TYPE DEVICES
10.1 All calculations shall be performed with the software program based on:
� ISO–5167/ASME (Miller Sm method)
� SPINK precise calculation
� AGA 3 to 8
� The orifice sizing calculation and program shall be subject to PDVSA approval.
10.2 The preferred initial differential design range shall be 100 inches water gauge toensure a beta ratio of 0.3 to 0.7. Other differential ranges shall be selected in orderto meet the requirements of paragraph 5.5.1.
10.3 For compressible fluids the differential in inches of water shall not exceed 1.5times the static pressure in psia.
10.4 All process data in form N° 20.21 shall be obtained from process engineers.
10.5 The final orifice plate calculation shall be tabulated on form N° 20.21. The orificeplate calculation program print out sheet provides the various coefficients, suchas Reynold’s number, thermal expansion, etc.
10.6 Expansion factor for compressible fluids shall be based on static pressuremeasurements upstream of the orifice plate.
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11 OTHER PRIMARY ELEMENT DEVICES
11.1 Turbine meters, positive displacement meters or mass flow meters shall be usedwhere requirements are dictated as per guidelines in paragraph 4.0. All thesemeters on class 1 service need a meter prover in accordance with API–MPMS–5.1TO 5.5–87. A bidirectional or compact type meter prover is preferred. All thesesystems are subject to PDVSA approval.
11.2 Magnetic, vortex or insertion type meters shall be used when their applicationswarrant as per guidelines in paragraph 4 subject to PDVSA approval. Vortex andsimilar primary elements shall be calibrated in a flow laboratory whenever theassembly is dismantled.
11.3 Glass rotameters shall be used on non–hazardous fluid flow measurementservices below 4 Bar G and 50°C. On all other applications, a metal tuberotameter shall be used.
The rotameters shall be installed without being subjected to any pipe stress andalso with a by–pass assembly in order to facilitate maintenance without shuttingdown the process.
12 FLOW INSTRUMENTS
12.1 The preferred instrument is a 316 stainless d/p cell transmitter complete with a 316stainless steel 3–valve manifold. Other material shall be used to resist fluidcorrosion properties.
12.2 Other types of instruments and accessories such as bellows, special flowcalculators, etc. may be used to meet the particular application.
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13 SPECIFICATION FORMS
FORM N° TITLE
20.1 and 20.10 Receiver instruments20.20 Differential pressure instrument20.21 Orifice plate and flanges20.22 Rotameters20.23 Magnetic flow meters20.24 Turbine flow meters20.25 Positive displacement meters
The forms are included at the end of this specification
NOTES:
� All necesary process data shall be obtained from process engineers.
� All additional necessary data to complete the forms shall be obtained from theselected manufacturers.
� PDVSA drawing No. 1 or 2 details shall be completed for each orifice plate.Copies are included at the end of this specification.
14 INSTALLATION AND COMMISSIONING
14.1 The upstream and downstream distances specified in Figures on pages 30 and31 are for orifice plates.
The same dimensions shall be maintained for any other selected type of primaryelement. Any reductions shall only be made with PDVSA approval.
14.2 The orientation of pressure taps shall be in accordance with Figure on page, 32.
14.3 All filter elements installed upstream of the primary flow measuring element shallbe designed to withstand maximum differential pressure in the line due to filterblockage.
14.4 All installation and commissioning shall be performed in accordance with projectdrawings and specifications.
15 Q.A. / Q.C.All items shall conform with the procedures detailed in specification K–369.
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ORIFICE
FIGURE 3A
ORIFICE
ORIFICE
PRECEDING FITTINGAS REQUIRED BY
PRECEDING FITTING
AS REQUIRED BY
� �
��
FIGURE 5
WITH ECCENTRIC REDUCERS, USE FIGURE 1 DIMENSIONS.LINE TO ENABLE USE OF PROPER BETA RATIO. FOR INSTALLATIONSDECREASE INTERNAL DIAMETER OF METER TUBE FROM THAT OF FLOWMETER TUBE. THIS TYPE OF INSTALLATION IS USED TO INCREASE ORTHIS FIGURE ILLUSTRATES A CONCENTRIC REDUCER PRECEDING THE
BE DOUBLED.THE PIPING REQUIREMENTS SHOWN FOR DIMENSION ”A”, SHOULDDIAMETERS) PRECEDED BY THIRD ELL IN A DIFFERENT PLANE,ELLS ILLUSTRATED ARE CLOSELY (LESS THAN THREE PIPEMETER TUBE ARE ILLUSTRATED IN FIGURE 2. NOTE: IF THE TWOTWO ELLS OR BENDS NOT IN THE SAME PLANE PRECEDING THE
IS PRECEDED BY A WIDE OPEN GATE, PLUG OR GLOBE VALVE.DIMENSIONAL DATA FOR FIGURE 3 APPLIES WHEN METER TUBEIN THE SAME PLANE. WHERE THERE ARE NO OTHER FITTINGS,ILLUSTRATED ARE METER TUBES PRECEDED BY TWO ELL BENDS
DIMENSIONAL DATA FOR FIGURE 3 SHALL APPLY.WHERE THERE ARE NO FITTINGS PRECEDING THE VALVE,LENGTH BE LESS THAN PERMITTED BY FIGURE 2, 3 OR 4.FITTING IMMEDIATELY PRECEDING IT, BUT IN NO CASE SHOULDOPEN, LENGTH REQUIREMENTS SHOULD BE BASED ON THE
VALVE PRECEDING THE METER TUBE. IF THE VALVE IS WIDEILLUSTRATION SHOWS REGULATOR OR PARTIALLY CLOSED
FIGURE 2
FIGURE 4
��
ORIFICEGREATER THAN 10D
FIGURE 3
LESS THAN 10D ORIFICE
A B
ORIFICE
��VALVE
GATE OR PLUG
� �
PARTIALLYCLOSED
ORIFICE
ORIFICE METERING–PIPING INSTALLATION REQUERIMENTS
FIGURE 1
A
B
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FIGURE 3B
4.– THE TERM FITTINGS INCLUDE ELBOWS, TEES, CROSSES, DRUMS, TANKS, THERMOWELLS, ETC.
3.– NO THERMOWELL OR PIPE INTRUSION ITEMS ARE PERMITTED WITHIN DISTANCES ”A” AND ”B”.
2.– ALL STRAIGHTENING VANES REQUIRE PDVSA APPROVAL.
RECOMMENDED THAT THE METER TUBE LENGTHS SHOWN IN FIGURE 2 BE USED.
1.– FOR THOSE INSTALLATIONS NOT EXPLICITLY COVERED IN INSTALLATION FIGURE 1 THROUGH 5 IT IS
NOTES:
FIG. 5
FIG. 4
FIG. 3
FIG. 2
FIG. 1
6201230
6201230
6201240
6201260
50 12 20 6
BABA
CLASS 3CLASS 1 OR 2
METERING ACCURACY
FIGURE
INSTALLATION
MINIMUM METER TUBE LENGTHS IN TERMS OF PIPE DIAMETERS
ORIFICE METERING–PIPING INSTALLATION REQUIREMENTS
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ONLYFLOW
ENTRAINED SOLIDS
LIQUIDS WITH OR WITHOUT
ONLYFLOW
WET–GAS OR
STEAM GAS ONLY
SINGLE PHASE
��
ENSURE PIPE IS ALWAYS FULL OF LIQUID
LOCATIONS OF ORIFICE FLANGE TAPPINGSFIGURE 4
VERTICAL FLOW
HORIZONTAL FLOW
GASESLIQUIDS OR STEAMLIQUIDS
RECEIVER INSTRUMENTS
Item N° Tag. N° No. ofinputs
Notes:
20.1b
ScaleRanges
Service
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES I.S.A SPDVSA–K–
N° By REVISED DATE
OFF SHEET OF
ChartRanges
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INSTRUCTIONS TO FILL FORMS20.1A AND 20.1B
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AUG.940
PDVSA 20.1
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RECEIVER INSTRUMENTS
a. To be used for a single item. Use secondary sheet for multiple listing.
b. Check as many as apply.
c. Nominal size refers to approximate front of case dimensions; width x height.
d. It is assumed that the instrument has its own case of shelf suitable for singlemounting, unless ‘‘MULTICASE” is checked. Shelf or separable case for multiplecase mounting instrument is not included unless listed and described as anaccessory.
e. Enclosure class refers to composite instrument. If electrical contacts are the casethey must meet this classification inherently or by reason of the enclosure. UseNEMA identification system or ISA System RP8.1.
f. Specify electrical power to the entire instrument from an external source.
g. For multiple instruments list ranges on secondary sheet, but specify other chartoptions on primary sheet. Chart graduations assumed to be uniform unlessotherwise noted. Circular charts assumed to have 24 hr/revolutions speed; stripcharts 3/4 in. to 1 in. per hour.
h. Chart drive mechanism assumed to be synchronous motor operating on 117V 60Hz and suitable for ENCLOSURE CLASS specified on line 5. If the chart drive ispneumatic so state – identify pneumatic pulser under options. Notes deviationsfrom standard (MFR) under notes i.e., dual speed or special speeds.
i. The scale type may be SEGMENTAL, VERTICAL, HORIZONTAL, DIAL(CIRCULAR) or other. Ranges 1, 2, 3 and 4 are used for multiple inputs. The firstlisted (N° 1) is assumed to be the controller input, if a controller is used.
j. See explanation of terminology given on specification sheet. For further definitionrefer to American National Standard C85.1–1963, ‘‘Terminology for AutomaticControl.’’ Specific ranges of control modes can be listed afetr ‘‘OTHER’’, ifrequired.
k. For multiple items specify on second sheet.
l. If standard auto–manual switching is not known or not adequate, specify particularrequeriments, such a BUMPLESS, PROCEDURELESS, 4–POSITION, or asrequired.
m. Remote set point adjustment assumes full adjustment range. Specify limits ifrequired. Under other can be noted bias or ratio.
n. Specify if applicable.
o. Specify if applicable.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORMS20.1A AND 20.1B
Page 2
AUG.940
PDVSA 20.1
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p. All input signals on multi–channel instruments assumed to be the same unlessotherwise noted.
q. Specify number of inputs.
r. Check if power source for the loop is contained in this instrument or in someexternal instrument.
s. Form may be SPST, DPDT or other. Rating refers to electrical rating of switch orcontacts in amps.
t. Specify if alarm is actuated by measured variable or by deviation from controllerset point, Give contact action if single throw form.
u. Specify required accessories and options, fill in number of charts. This is assuredto be number of chart roles for strip charts.
v. After selection is made fill in manufacturer and specific model number.
SECONDARY SHEET – For listing multiple instruments. List all instruments of thesame type specified on the primary sheet, with variations an shown. ‘‘Notes refersto notes listed by number at the bottom of the sheet. Line 11 of sheet 1a istabulated under measurement increases, output tabulate increase or decrease.
DIFFERENTIAL PRESSURE INSTRUMENTS
Notes: 1. All items shall be corrosion resistant to marine atmosphere and tropicalised.2. Alarm contact shall be normally closed and open on alarm condition. Alarm setting shall be adjustable
20.20a
Safe area Classified Class Group Div
3. Material
5. Power Supply
Weatherproof Ex. Proof Intr. safe STD.
Temp. Class T1 T2 T3 T4 T5 T6
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES I.S.A SPDVSA–K–
N° By REVISED DATE
OFF SHEET OF
GENERALRecord Indicate Control Transm
1. Tag N° Service2. Function
110 V 60 Hz 24 Volts d.c.
XMTR 9. Output 4–20 m.A. 3–15 Psig Other
Conn–1/2 nptRating18. Body
23. Model No
CONTR
ALARMS
OPTIONS
MFR
Integrator
Yoke
4. Enclosure
10. Cont. Mode P PI Reversible Action
Diaphragm Bellows16. Element
Body Element17. Material
Flanged
SERVICE
19. Diff Range Adj. Range Set At
Other
20 Psig
6. Chart Circular Range Drive–Elec Spring Speed
8. Scale Range 1 2 3
12. Set Point ADJ Manual Remote
13. Output 4–20 m.A. 3–15 Psig Other
Flow Level Diff. Press Elevation14. Type Suppression
Fluid Max. Temp.Max. Press20. Process Data
22. Options Pressure element Range Material
Temp. Element Range Type
Filt Reg Gauges Charts 3–valve manifold
Function on measurement input High Low High and Low
Rating 1 AMP. at 24 Volts D.C. see note 2No. of alarms
21. Switches
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20.20b
DIFFERENTIAL PRESSURE INSTRUMENTS
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES I.S.A SPDVSA–K–
N° By REVISED DATE
OFF SHEET OF
Tag. N°
NOTES
Set Range ServiceScale or Chart NotesScale Factor
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REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORMS20.20A AND 20.20B
Page 1
AUG.940
PDVSA 20.20a
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DIFFERENTIAL PRESSURE INSTRUMENTS
1. To be used for a single item. Use secondary sheet for multiple listing.
2. Check as many as apply.
3. Nominal size refers to approximate front of case dimensions; width x height.
4. Yoke refers to a bracket designed for mounting the instrument on a pipe stand.
5. Enclousure class refers to composite instrument. If electrical contacts are thecase they must meet this classification inherently or by reason of theenclousure. Use NEMA identification system or ISA System RP8.1.
6. Specify electrical power to the entire instrument from an external source.
7. Specify chart size, range and number if applicable.
8. ‘‘24 hr’’ is the time for one rotation of the chart. Other speeds should be listedin hours or days. If a spring wound clock is used fill in number of hours or daysit runs between windings.
9. The scale type may be SEGMENTAL, ELECTRIC, or DIAL (CIRCULAR).Space is provided for multiple ranges on the same scale.
10. Specify transmitter output if applicable.
11. See explanation of terminology given on specification sheet. For furtherdefinition refer to American National Standard C85–1–1963, ‘‘Terminology forAutomatic Control.’’ Specific ranges of control modes can be listed after‘‘OTHER’’, if required.
12. For multiple items specify on seconds sheet.
13. If standard auto–manual switching is not known or not adequate, specifynumber of positions.
14. Remote set point adjustment assumes full adjustment range. Specify limits ifrequired.
15. Specify if applicable.
16. Specify if applicable.
17. Specify measured variable.
18. Specify type od element or write in ‘‘MFR.STD’’.
19. Materials refer to wetted parts only.
20. Over–range protection refers to maximum differential pressure. Theinstrument can withstand without a shift in calibration.
21. Adjustable range means that the range can be changed without replacing anyparts.
22. Elevation.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORMS20.20A AND 20.20B
Page 2
AUG.940
PDVSA 20.20a
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23. Give process data affecting meter selection. Flow elements such as orificeplates are specified on separate forms.
24. Refers to connections piped to process equipment or pipe line. Special flangedconnections and extended diaphragms for level applications should bedescribed afetr ‘‘OTHER’’.
25. Form may, be SPST, DPDT, or others. Rating refers to electrical rating of switchor contacts in amps.
26. Specify if alarm is actuated by measured variable or by deviation from controllerset point. Give contact action if single throw form.
27. Specify required accessories. If temperature element is used, the second lineis provided to specify well, length of capillary tubing and other details of thethermal system.
28. After selection is made fill in manufacturer and specific model number.
SECONDARY SHEET – For listing multiple instruments. List all instruments of thesame type specified on the primary sheet, with variations an shown. ‘‘Notes refersto notes listed by number at the bottom of the sheet.
S20.21
ORIFICE PLATE AND FLANGES
Tag
Accuracy
Erosive Corrosive With solids Liquid Gas
Class 1 (� 1%) Class 2 (� 2%) Class 3(>2%)
Process DataUnits
Service conditions
Maximum Normal Minimum
k
z
CP
Pipe line Size SCH
Meter run
Fabricated meter run:
Notes: Planimeter equation if applicable
ORIFICE PLATE
Service
INSIDE DIA.
Steam
Flow rate
Pressure
Temperature
Density
Molecular weight
SP. GR. at base conds.
Viscosity
Compressibility factor
Specific heat ratio
INCHES
Size SCH INSIDE DIA.INCHES
Orifice platecalculations
Maximum flow rate
Differential range
Orifice diameter
b ratio
Chart multiplier
Bleed hole
Plate thickness
Reading x
Yes
= flow rate
No Vent Drain
ORIFICE FLANGES
1. Concentric2. ISO–5167 STD3. Bore:4. Material:5. Carrier ring:6. MFR. & Model N°
Other:Other:
Exact Nearest 1/8 in304 SS 316 SS Other:
Yes No Matl. Type
7. Taps: 8. Size: 9. Type10. Material:11. Flanges:12. Flange rating:
Other:Other:
Weld–neck Slip–onC.Steel Other:Yes No
Flange Pipe1/2 inch
Yes No ISO–5167 STD Type
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES I.S.A SPDVSA–K–
N° By REVISED DATE
OFF SHEET OF
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REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.21
Page 1
AUG.940
PDVSA 20.21
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ORIFICE PLATES AND FLANGES
1. Check if concentric bore, or write in eccentric, segmental, etc.
2. ISA Standard reference given above. This also conforms to AGA–ASMErequirements.
3. Check whether plate is to be bored odd size for exact maximum rate, or tonearest 1/8 in. for approximate maximum rate.
4. Select plate material.
5. If ring joint assembly is used, give ring material and configurations.
6. Refers to plate, not flanges.
7. Select one of the standard tap locations or write in other.
8. Select tap size.
9. Select flange construction.
10. Select flange material. If stainless steel, show type; such as, ‘‘304 SS.”.
11. Indicate whether orifice flanges are to be included with the plate, orfurnished by others.
12. Note flange rating.
13. Tag number or other identification N°.14. Process service.
15. Line number. Include line size.
16. List fluid, unless classified.
17. Liquid, gas, or vapor.
18. Maximum flow assumed to be meter maximum. Give flow units.
19. Figure only if units given above.
20. Upstream operating pressure and units. This is also the contract figureunless otherwise noted.
21. Operating temperatute, °F or °C. See comment in 20 above.
22. Specific gravity at Base Temperature.
23. Liquid specific gravity at operating temperature given on Line 21.
24. Applies to gas, at operating pressure. Supercompressibility factornormally required for gases over 100 psig because the gas at this pressureand above does not follow the ideal gas laws.
25. Applies to vapor or gas. Cp specific heat at constant pressure, Cv specificheat a constant volumes – Ratio = K at the operating temperature.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.21
Page 2
AUG.940
PDVSA 20.21
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26. Viscosity and units, at operating temperature given on line 21.
27. Applies to vapor or steam. Write ‘‘SAT’’ if saturated; otherwise give %quality or degrees superheat, in F or C.
28. Contract base conditions. Pressure must be given in absolute units.
29. Bellows, diaphragm, mercury, etc.
30. Set range and units.
31. Applies to wet meters.
32. Fill in if applicable.
33. Full scale range and units. See comment under 18 above.
34. Fill in required.
35. Fill in for final records after approved bore calculation is available.
36. For final records, see comment on 35.
37. In inches; or give line size and Schedule.
38. ANSI Flange Rating, i.e., 4 in. 300 lb RF.
39. If desired, state whether top or bottom.
40. Give plate thickness.
S20.22
ROTAMETERS
Notes: 1. All items shall be corrosion resistant to marine atmosphere and tropicalised
Tag
Accuracy
Erosive Corrosive With solids Liquid
Class 3(>2%)
Process Data
UnitsService conditions
Maximum Normal Minimum
k
CP
Pipe line Size SCH
Meter run
Service
INSIDE DIA.
Flow rate
Pressure
Temperature
Density
Molecular weight
SP. GR. at base conds.
Viscosity
Compressibility factor
Specific heat ratio
INCHES
Size SCH INSIDE DIA.INCHES
Meter
Conn. Size/Type
Inlet. Dir./Outlet Dir.
Fitting Material
Packing or O–Ring Mtl.
Enclosure Type
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES PDVSA–K–302
N° By REVISED DATE
OFF SHEET OF
Tube Mtl/Float Mtl
Meter Scale: Length & Type
Meter Scale Range
Meter Factor
Extension Well Mtl
Gasket Mtl
Transmitter OutputTrans. Enclosure Class
Scale Range
Valve Size & MaterialValve Location
Const. Diff. Relay Mtl
Purge Meter Tubing
Airset
No. of Contacts Form
Rating Housing
Action
EXT
XMTR
5
6
7
8
9
10
1112
13
14
15
16
Size Float Guide
30
31
3233
34
35
3637
38
3940
41
42
43
MFR Model No.
Gas
17
19
20
Tube Number
Float Number
OPTION
ALARMS
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REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.22
Page 1
AUG.940
PDVSA 20.22
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ROTAMETERS
1. List tag number.
2. Show line number, vessel number, or line specification.
3. Give function such as INDICATE, RECORD, CONTROL, TRANSMIT,INTEGRATE, etc.
4. FLUSH PANEL, FRONT PANEL, PIPE, etc.
5. Give voltage, dc or ac, and ac frequency.
6. Give nominal connection size and type such as SCREWED, 150 lb FLANGED,etc.
7. Select orientation of inlet and outlet designated as RIGHT, LEFT, VERTICALOR REAR.
8. Select material of end fittings. Note if lining is required.
9. Select either packing or ‘‘O’’ ring design and note material.
10. Select type of enclosure, if any, such as SIDE PLATE, SAFETY GLASS, etc.
11. Give meter size. Note that this is not the same as connection size but refersto the nominal size of the tube and float combination.
Give the method of float guiding as NONE, FLUTES, POLE, EXTENSIONS.
12. Select tube and float material.
13. Selct type meter scale: NONE, ON GLASS, METAL STRIP. select meter scalelength.
14. Select meter scale range and flow units. Remember that rotameter’s scalescannot start at zero but typically have rangeability of 10:1 or 12:1.
15. Meter factor if not direct reading.
16. Accuracy statement does not imply any specific calibration.
17. Note if hydraulic calibration is required and state required accuracy.
18. If fluid cannot be identified, state if liquid or gas.
19. Give fluid color or transparency which will affect float visibility in glass tubemeters.
20. List maximum operating flow rate and units, usually the same as maximum ofmeter scale.
21. Show normal and minimum flow rates expected.
22. Give operating specific gravity of liquid (Numerically equal to density ingm/cm3).
23. Give maximum expected viscosity and units.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.22
Page 2
AUG.940
PDVSA 20.22
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24. Give operating pressure and temperature, with units,.
25. For gases give operating density and units, unless molecular weight is on Line27.
26. For gases give density at standard conditions (14.7 psia and 60°F unless statedotherwise, and/or molecular weight if known.
27. State maximum allowable pressure drop at full flow, if applicable.
28. If meter has an extension well, state material of well.
29. Select material of gasket on extension.
30. If meter transmits, state pneumatic or electronic output such as 21–103 kPa(3–15 psig), 4–20 mA, etc.
31. Give transmitter electrical classification such as General Purpose, Class 1,Group D, etc.
32. Give transmitter scale size and range. Note that this is not the meter scale butthe scale of the attached instrument.
33. Number of alarm contact in case.
Form of contacts: SPDT, SPST, DPDT, etc.
34. Contact electrical load rating. Contact housing – GP, Class I, GR.D, etc. UseNEMA identification.
35. HIGH, LOW, DEVIATION.
36. Specify needle valve if required.
37. Valve may be on the inlet, outlet or separately mounted. Do not list here if valveis to be furnished by others.
38. This relay may be used on purge assemblies.
39. When manufacturer is selected fill in exact model and part numbers.
S20.23
MAGNETIC FLOWMETERS
Notes: 1. All items shall be corrosion resistant to marine atmosphere and tropicalised
Tag
Accuracy
Erosive Corrosive With solids Liquid
Class 3(>2%)
Process Data
UnitsService conditions
Maximum Normal Minimum
CP
Pipe line Size SCH
Meter
Service
INSIDE DIA.
Flow rate
Pressure
Temperature
Density
SP. GR. at base conds.
Viscosity
Fluid conductivity
INCHES
Size SCH INSIDE DIA.INCHES
Meteringelement
Size, Sched
Line Material
Connection TypeConnection Mat’ls
Tube Material
Liner MaterialElectrode Type
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES PDVSA–K–302
N° By REVISED DATE
OFF SHEET OF
Meter Casing
Power Supply Elect. Code
Grounding, Type & Matl
Enclosure Class
Instrument Tag Number
Function
Mounting
Enclosure Class
Length Signal Cable
Type Span Adjustment
Power Supply
Transmiter Output
Integrator
Modes Output
Contact. No. Form
Rating Elec. Code
Action
SECONDARY INSTR.
OPTIONS
5
6
7
8
910
11
12
13
14
15
16
Electrode Matl
26
27
28
29
30
31
32
33
34
35
363738
39
40
41
42
43
44
MFR MODEL N°
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REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.23
Page 1
AUG.940
PDVSA 20.23
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MAGNETIC FLOWMETERS
1. Tag number of meter only.
2. Refers to process application.
3. Show line number or identify associated vessel.
4. Give pipeline size and schedule. If reducers are used, so state.
5. Give material of pipe. If lined, plastic or otherwise non–conductive, so state.
6. Give connection type: FLANGED, DRESSER COUPLINGS, etc.
7. Specify material of connections.
8. Select tube material. (Non–permeable material required if coils are outsidetube).
9. Specify material of line.
10. Select electrode type: STD, BULLET NOSED, ULTRASONIC CLEANED,BURN OFF, etc.
11. Specify electrode material.
12. Describe casing: STD, SLPASH PROOF, SUB–MERSIBLE, SURMERGEDOPERATION, etc.
13. Give ac voltage and frecuency, along with application NEMA identification ofthe electrical enclosure.
14. State means for grounding fluid: GROUNDING RINGS, STRAPS, etc.
15. State power supply and enclosure class to meet area electrical requirements.
16. State fluid by name or description.
17. Give maximum operating flow and units; usually same as maximum ofinstrument scale.
18. Give maximum operating velocity, usually in ft/s.
19. List normal and minimum flow rates.
20. List maximum and minimum fluid temperature °F.
21. List maximum and minimum fluid pressure.
22. List maximum (at lowest temp.) conductivity of fluid.
23. If a possibility of vacuum exists at meter, so state and give greatest value(highest vacuum).
24. List tag number of instrument used directly with meter.
25. Control loop function such as INDICATE, RECORD CONTROL, etc.
26. Mounting: FLUSH PANEL, SURFACE INTEGRAL WITH METER, etc.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.23
Page 2
AUG.940
PDVSA 20.23
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27. Give NEMA identification of case type.
28. State cable length required between meter and instrument.
29. Span adjust: BLIND, ft/s DIAL, OTHER.
30. Give ac supply voltage and frequency.
31. If a transmitter, state analog output electrical or pneumatc range, or pulse trainfrequency for digital outputs, i.e, pulses per gallon.
32. List scale size and range.
33. List Scale Size and Range for indicating transmitter.
34. Recorder chart speed in time per revolution or inch per hour.
35. List chart range and number.
36. If integrator is used, state counts per hour, or value of smallest count; such as‘‘10 GAL UNITS’’.
37. For control modes: (Per ANSI C85.1–1963, ‘‘Terminology for AutomaticControl’’). Write–in PIf, If, PIs, PIfDf, etc.
P = proportional (gain)
I = integral (auto reset)
D = derivative (rate)
Subscripts:
f = fast
s = slow
n = narrow
State output signal range, pneumatic or electronic.
38. Controller action in response to an increase in flowrate – INC. or DEC.
State auto–man. switch as NONE, SWITCH ONLY, BUMPLESS, etc.
39. Number of alarm lights in case. Give form of contacts; SPDT, SPST, etc.
40. Contact electrical load rating. Contact housing General Purpose, Class I,Group D, etc., if not in the same enclosure described in line 29.
41. Action of alarm: HIGH, LOW, DEVIATION, ETC.
42. Fill in manufacturer and model numbers for meters.
43. and
44. Instrument after selection.
S20.24
TURBINE FLOWMETERS
Notes: 1. All items shall be corrosion resistant to marine atmosphere and tropicalised
Tag
Accuracy
Erosive Corrosive With solids Liquid
Class 1 (+ 1%) Class 2 (+ 2%) Class 3(>2%)
Process Data
UnitsService conditions
Maximum Normal Minimum
kCP
Pipe line Size SCH
Meter run
Service
INSIDE DIA.
Flow rate
PressureTemperature
DensityMolecular weightSP. GR. at base conds.ViscosityCompressibility factor
Specific heat ratio
INCHES
Size SCH INSIDE DIA.INCHES
Meter End Connections
Body Rating
Nominal Flow RangeAccuracy
Linearity
K Factor, Cycles per Vol. Unit
Excitation
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES PDVSA–K–302
N° By REVISED DATE
OFF SHEET OF
Materials: BodySupportShaftFlanges
Secondary Instr. Tag No.
Function
Mounting
Power Supply
Scale Range
Output Range
Totalizer Type
Compensation
Preset Counter
Enclosure Class
Strainer Size & Mesh
SECONDARY INSTR.
5
6
7
8
9
10
11
1213141516
34
35
36
37
38
39
40
41
42
43
44
MFR Model No.
Gas
17
18
19
20
Bearing: Type
Bearing: Material
Max. Speed
Min. Output Voltage
Rotor
21
22
23
Pickoff Type
Enclosure Class
45
46
4748
No. of Pickoffs:
24 Preamplifier: Mounted on meterOther:
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REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.24
Page 1
AUG.940
PDVSA 20.24
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TURBINE FLOWMETERS
Refer to ISA Standard S31, ‘‘Specification, Installation and Calibration of TurbineFlowmeters’’
1. Show meter tag number, Quantity is assumed to be one unless otherwisenoted.
2. Refers to process service or applications.
3. Give line number or process area.
5. Specify size and style of connections, such as ‘‘ 1 in. NPT’’, ‘‘2 in. 150 lbANSI’’, etc.
6. Pressure and temperature design rating required.
7. Nominal flow range is obtained from manufacturer’s data. This usuallydefines linear range of selected meter.
8. Turbine meter accuary figures are terms of percent of instantaneous flowrate.
9. Degree of linearity over nominal flow range.
10. K factor relates cycles per second to volume units. Enter this figure afterselection is made.
11. Excitation modulating type only expressed as volts at hertz.
12 to 16. Specify materials of construction or write in ‘‘MFR STD’’.
17. Specify sleeve or ball bearings, or name if floating rotor design.
18. Bearing material will be MFG STD if not stated otherwise.
19. Maximum speed or frequency which the meter can produce without physicaldamage.
21. Pickoff may be standard hi–temp., radio–frecuency type (RF) or explosionproof. Minimum output voltage volts peak to peak.
22. Specify electrical classification of enclosure such as General, Purpose,Weather Proof, Class 1, Group D, etc.
23. Specify fluid data as indicated, using line 28 for additional item if required.
34. Give Tag No. of secondary instrument if different from meter Tag No..
35. Pre–amplifier if used.
36. Specify function of instrument, such as rate indicator, totalizer, or batchcontrol.
37. Flush, surface or rack.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.24
Page 2
AUG.940
PDVSA 20.24
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38. Power Supply, i.e., 117 Vac.
39. Applies to rate indicator.
40. Give output range such as ‘‘4–20 mA’’, 21–103 kPa (3–15 psig), etc.
41. May be used for number of digits, and to state whether counter is reset ornon–reset type.
42. Specify range of compensation, if required, in pressure and/or temperatureunits or viscosity units.
43. Pre–set counter.
44. Specify NEMA classification of enclosure.
45. Specify strainer size and mesh size. Request vendor’s recommendation ifnot known.
50. Fill in after selection is made.
51. Fill in after selection is made.
52. Fill in after selection is made.
S20.25
POSITIVE DISPLACEMENT METERS
Notes: 1. All items shall be corrosion resistant to marine atmosphere
Tag
AccuracyErosive Corrosive With solids LiquidClass 1 (± 1%) Class 2 (± 2%) Class 3(>2%)
Process Data
UnitsService conditions
Maximum Normal Minimum
k
CP
Pipe line Size SCH
Meter run
Service
INSIDE DIA.
Flow ratePressureTemperature
Density
Molecular weightSP. GR. at base conds.
Viscosity
Compressibility factor
Specific heat ratio
INCHES
Size SCH INSIDE DIA.INCHES
Meter Type of elementSizeEnd ConnectionsTemp. & Press. RatingFlow Rate RangeTotalized UnitsEnclosure Class
PROJECT REFERENCEITEM N° QUANTITY
SPECIFICATION REFERENCES PDVSA–K–302
N° By REVISED DATE
OFF SHEET OF
Materials: Outer HousingMain Body CoverRotating ElementShaft
Register TypeTotalizerResetCapacitySet–Stop
Flow UnitsShut–Off Valve
Switch: Single or 2–Stage
Temp. Compensator
Air EliminatorStrainer: Size & Mesh
COUNTER
OPTIONS
5
67
8
9
10
1112
13
141516
Power Supply
26
35
36
37
38
4142
43
44
MFR Model Number
Gas
4
17
18
1920
Bearing: Type & MaterialPackingType of CouplingPulse transmitter type:
Blades
21
22
23
24
25
46
No. of outputs:
K Factor, pulses per vol. unit:Transmitter output:
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REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.25
Page 1
AUG.940
PDVSA 20.25
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Menú Principal Indice manual Indice volumen Indice norma
POSITIVE DISPLACEMENT METERS
1. Tag No. of instrument.
2. Process service.
3. Pipe line or vessel identification.
4. Write in type of rotating element, such as, disc, piston, vane, helical,
rotors, etc.
5. Show connection pipe size.
6. Specify end connections type and ANSI rating such as 300 lb R.F.
7. Specify the manufacturer’s recommended body pressure and
temperature rating, such as 250 psi at 190°F.
8. Write in manufacturer’s recommended normal operating range.
9. Specify smallest totalized unit, such as ‘‘Tens of Gallons’’, ‘‘Pounds’’,
’’Barrels’’.
10. Specify enclosure electrical classification, if applicable, such as ‘‘Class
1, Group D., Div. 2’’, ‘‘General Purpose’’, etc.
11. Specify power supply, if applicable.
12. Specify materials of construction. If no preference, write in, MFR.STD.
(Manufacturer’s Standard).
13–18. Specify materials of construction, if no preference, write in,
Manufacturer’s Standard (MFG–STD).
19. Specify type of coupling.
20. Specify coupling such as ‘‘Magnetic’’, or MFR.STD.
21. Specify register type such as horizontal, vertical, inclined, inline
reading, dial reading, print, etc.
22. specify number of figures such as 6 digit, 5 digit, or 0–99, 999, etc.
23. If totalizer reset required write in type. If reset is not required, write in
none.
24. Write in number of figures or maximum quantity (in flow units) that can
be held in counter.
REVISION DATE
ENGINEERING SPECIFICATION
INSTRUCTIONS TO FILL FORM 20.25
Page 2
AUG.940
PDVSA 20.25
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Menú Principal Indice manual Indice volumen Indice norma
25. Specify by writing in ‘‘yes’’ if a set–stop is required to operate shutoff
valve, switch, etc.
27–34. Specify fluid data as completely as possible, note at operating
conditions. Be sure to note if liquid is at saturation conditions.
35. Specify by writing in ‘‘yes’’ if a shut–off valve is required. Valve to be
manufacturer’s standard construction unless otherwise noted.
36. Specify by writing in ‘‘yes’’ if a switch is requered. Two switches are
required for 2–stage shut–off control.
37. Write in ‘‘yes’’ if manufacturer’s standard temperature compensator is
required. Write in ‘‘no’’ if not required.
38. Specify, if transmitter is required, by writing in type such as pulse, rate
of flow, etc.
39. Give transmitter output in pulse per gallon, 4–20 mA, etc.
40. Write in ‘‘yes’’ if air eliminator is required, otherwise write in ‘‘no’’.
41. Specify, if strainer is required, by writting in type such as ‘‘Y’’, ’’Basket’’,
etc. Strainer to have same pressure and temperature rating, end
connections and material as meter body unless otherwise noted.
45–46. Identify manufacterer’s name and model number after selection is
made.