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


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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

http://www.intevep.pdv.com/santp

http://www.intevep.pdv.com/santp/mid/indice_mid.htm

http://www.intevep.pdv.com/santp/mid/vol09-1/indice_vol09-1.htm

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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




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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.




http://www.intevep.pdv.com/santp/mid/vol09-1/k-300.pdf

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PDVSA K–302


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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.




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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




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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




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PDVSA K–302


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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




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AUG.940

PDVSA K–302


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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.




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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

°




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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.




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PDVSA K–302


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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.




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AUG.940

PDVSA K–302


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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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PDVSA K–302


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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.




REVISION DATE



AUG.940

PDVSA K–302


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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




REVISION DATE



AUG.940

PDVSA K–302


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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




REVISION DATE



AUG.940

PDVSA K–302


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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.




REVISION DATE



AUG.940

PDVSA K–302


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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

–+




REVISION DATE



AUG.940

PDVSA K–302


��

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

+–




REVISION DATE



AUG.940

PDVSA K–302


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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




REVISION DATE



AUG.940

PDVSA K–302


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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.




REVISION DATE



AUG.940

PDVSA K–302


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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




REVISION DATE



AUG.940

PDVSA K–302


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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.




REVISION DATE



AUG.940

PDVSA K–302


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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.




REVISION DATE



AUG.940

PDVSA K–302


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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>

< << <

>< << <




REVISION DATE



AUG.940

PDVSA K–302


��

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

��

�

��




REVISION DATE



AUG.940

PDVSA K–302


��

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.




REVISION DATE



AUG.940

PDVSA K–302


��

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.




REVISION DATE



AUG.940

PDVSA K–302


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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.




REVISION DATE



AUG.940

PDVSA K–302


��

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.




REVISION DATE



AUG.940

PDVSA K–302


��

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




REVISION DATE



AUG.940

PDVSA K–302


��

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




REVISION DATE



AUG.940

PDVSA K–302


��

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

��

REVISION DATE


INSTRUCTIONS TO FILL FORMS20.1A AND 20.1B

Page 1

AUG.940

PDVSA 20.1

��


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



Page 2

AUG.940

PDVSA 20.1

��


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



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

��

20.20b




N° By REVISED DATE

OFF SHEET OF

Tag. N°

NOTES

Set Range ServiceScale or Chart NotesScale Factor

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REVISION DATE



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AUG.940

PDVSA 20.20a

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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



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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



N° By REVISED DATE

OFF SHEET OF

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REVISION DATE


INSTRUCTIONS TO FILL FORM 20.21

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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.




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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


k

CP

Pipe line Size SCH

Meter run

Service

INSIDE DIA.

Flow rate

Pressure

Temperature

Density

Molecular weight


Viscosity


Specific heat ratio

INCHES


Meter

Conn. Size/Type

Inlet. Dir./Outlet Dir.

Fitting Material

Packing or O–Ring Mtl.

Enclosure Type


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



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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



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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


Tag

Accuracy


Class 3(>2%)

Process Data



CP

Pipe line Size SCH

Meter

Service

INSIDE DIA.

Flow rate

Pressure

Temperature

Density


Viscosity

Fluid conductivity

INCHES


Meteringelement

Size, Sched

Line Material

Connection TypeConnection Mat’ls

Tube Material

Liner MaterialElectrode Type



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



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.




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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


Tag

Accuracy


Class 1 (+ 1%) Class 2 (+ 2%) Class 3(>2%)

Process Data



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


Meter End Connections

Body Rating

Nominal Flow RangeAccuracy

Linearity

K Factor, Cycles per Vol. Unit

Excitation



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:

��

REVISION DATE



Page 1

AUG.940

PDVSA 20.24

��


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.




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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.






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



k

CP

Pipe line Size SCH

Meter run

Service

INSIDE DIA.

Flow ratePressureTemperature

Density

Molecular weightSP. GR. at base conds.

Viscosity


Specific heat ratio

INCHES


Meter Type of elementSizeEnd ConnectionsTemp. & Press. RatingFlow Rate RangeTotalized UnitsEnclosure Class



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:

��

REVISION DATE



Page 1

AUG.940

PDVSA 20.25

��


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



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AUG.940

PDVSA 20.25

��


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.




PDVSA k-302

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