k-304.pdf

PDVSA N TITLE

REV. DATE DESCRIPTION PAG. REV. APPD. APPD.

APPD.BY DATEDATE

VOLUME 9I

1994

K304 TEMPERATURE INSTRUMENTATION

FOR APPROVAL

Eliecer Jimnez Alejandro NewskiAUG.94 AUG.94

ENGINEERING SPECIFICATION

AUG.94 L.T.0 17 E.J. A.N.

ENGINEERING DESIGN MANUAL

ESPECIALISTAS

APPD.BY

REVISION DATE


TEMPERATURE INSTRUMENTATION

Page 1

AUG.940

PDVSA K304

Men Principal Indice manual Indice volumen Indice norma

Index

Page

1 SCOPE 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 CODES, STANDARDS AND PRACTICES 3. . . . . . . . . . . . . . . . . . . .

3 DEFINITIONS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 DESIGN REQUIREMENTS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 Temperature Measurement in Process Vessels / Piping /

Equipment / Furnaces 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 Thermowells 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 Temperature Gauges 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4 Temperature Transmitters and Transducers 13. . . . . . . . . . . . . . . . . . . . . . . . . 4.5 Temperature Indicators / Recorders with or Without

Controllers Mounted in Field 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6 Temperature Indicators / Recorders with or Without

Controllers Mounted Inside Air Conditioned Control Room 13. . . . . . . . . . . . 4.7 Temperature Switches Filled System Type 13. . . . . . . . . . . . . . . . . . . . . . . . . . 4.8 Self Acting Temperature Regulator 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.9 Multi Point Temperature Indicator. 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.10 Multi Point Temperature Recorder 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.11 Tube Skin Thermocouples 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 SPECIFICATION FORMS 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 INSTALLATION AND COMMISSIONING 17. . . . . . . . . . . . . . . . . . . . . .

7 Q. A. / Q. C. 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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PDVSA K304


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 Divisin,

Apartado 76343

Caracas 1070A

Venezuela


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AUG.940

PDVSA K304


1 SCOPE

This section covers PDVSA requirements for the design, specification, installationand commissioning of temperature instrumentation. All guidelines of theintroduction specification K300 shall also be explicitly followed.

2 CODES, STANDARDS AND PRACTICES

A.P.I. RP550, Section 3

ANSI MC96.1 Temperature measurement thermocouples

DIN 43760 Resistance element.

3 DEFINITIONS

All definitions are listed in specification K300.

4 DESIGN REQUIREMENTS

Temperature measurement with or without control facilities are classified into thefollowing categories.

Temperature gauges directly connected to process

Temperature transmitters

Field mounted temperature indicators / recorders with or without controllers

Temperature indicators / recorders with or without controllers mounted insideair conditioned control room.

Temperature switches

Self acting temperature regulator mounted in process lines

Multipoint temperature indicator

Multipoint temperature recorder

Tube skin thermocouples.

The guidelines a to n on the following pages aid in design of above listed items.


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PDVSA K304


a. The range selected shall ensure that the normal operating condition isapproximately at mid scale and that the maximum process operating temperaturedoes not exceed 80% of the range of the indicating instrument or self actingregulator.

b. Thermowells shall be installed where there is flow and rapid response, such as inan elbow against the direction of flow, rather than where fluid is stagnant. Theprimary element and the thermowell shall be procured as one complete assemblyto ensure adequate fit and fast response of the temperature measurement. Theinsertion lengths and construction of thermowells shall conform with guidelines inparagraph 4.2.

FLOW

FLOW


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PDVSA K304


c. The thermocouple shall be mineral insulated 316 stainless steel sheathed.

I.S.A. Type as specified. See ANSI/MC 96.1 for additional details. See figure onpage 6 for a typical assembly.

Thermocouple hot junction shall be ungrounded, single or duplex type as specifiedbelow:

Type K for temperature from 20C to + 1000C Type T for cryogenic temperatures Type B for temperatures above 1000C.

The use of duplex couples shall be avoided except where process conditionsdemand exotic materials for vessel, pipe and/or thermowell. The use of oneduplex thermocouple for control service and for the initiation of safeguardingsystems is not allowed.

Where type K thermocouples operate on hightemperature services andhydrogen diffusion to the thermocouple material is expected,magnesiumoxideinsulated thermocouples with Inconel protective sheathingshall be used.

Thermocouples for measuring skin temperature of furnace tubes shall be type K.

In each furnace two additional type B thermocouples shall be installed close to twoof the type K skin couples for checking purpose. These type B thermocouplesshall be connected to an accessible terminal box for connection to a portableinstrument.

On temperature measurements greater than 700C. lead fibre glass powdertype sealant shall be used instead of epoxy in the fabrication of the completethermocouple assembly.

d. Resistance elements shall be 3wire Pt100, platinum type to DIN standard43760 unless otherwise specified. The element shall be in a 316 stainless steelsheath, single or duplex type as specified. See figure below for typical assembly.


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PDVSA K304


Fig 1. SHEATHED TYPETHERMOCOUPLE

WIRE TYPE THERMOCOUPLE

THERMOCOUPLE WIRES

POTTING COMPOUND

THERMOCOUPLE WIRECOMPACTED MINERAL INSULATION

SHEATH

AND WELDED

BUTT WELDED OR TWISTED

2 THERMOCOUPLE WIRES

DOUBLE BORE CERAMIC INSULATORS

SOLID BARSTOCK DRILLED

EXTENSIONLAGGING

CONNECTION

INTERNAL

U

ODID

AND UNION

NIPPLE

ELEMENT LENGTH

CONNECTIONPROCESS

ODID

U

1 NPTMCONNECTION

PROCESS

CONNECTIONINTERNAL

EXTENSIONTERMINALHEAD


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PDVSA K304


Fig 2. SHEATHED TYPE RESISTANCE ELEMENT

8 mm ISO OPTIONAL CONNECTION SPRING LOADED BLOCK

33

TAILS

STANDARD RESISTANCE BULB

SHEATH

6 0.05

DETECTOR25

A


EXTENSIONLAGGING

CONNECTIONINTERNAL

T U

ODID

AND UNIONNIPPLE

ELEMENT LENGTH

CONNECTIONPROCESS

ODID

U

1 NPTMCONNECTION

PROCESS

CONNECTIONINTERNAL

EXTENSIONTERMINAL

HEAD


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AUG.940

PDVSA K304


e. Field mounted temperature indicating, recording instrument, switch, transmitter,transducer and controller shall have wall / yoke mounting cases with bottomconnections.

f. Panel mounted temperature indicating, recording instrument, switch, transmitter,transducer and controller shall have flush mounting cases with rear connections.

g. The instrument shall have over range protection 50% greater than the maximumoperating temperature without suffering any damage.

h. The instrument shall have the feature to detect the open circuit of thethermocouple or resistance element input. This feature shall drive the output ofthe instrument to either upscale or downcale depending upon the specificapplication to ensure a safe operating condition of the equipment and/or plant.

i. All electrical conduit connections shall be 1/2 N.P.T.F. and all pneumaticconnections shall be 1/4 N.P.T.F.

j. The temperature indicating pointers shall be adjustable with a micrometer typescrew

k. Inline mounted bimetallic temperature gauges shall be adjustable every angletype.

l. Filled system shall be rigid stem, with bendable extension and stainless steelarmour, all 316 stainless steel construction. The capillary tubing shall be ANSI 316stainless steel and shielded by flexible stainless steel tubing with a PVC cover.

m. All measurements shall be compensated for ambient temperature changes.

4.1 Temperature Measurement in Process Vessels / Piping / Equipment/ Furnaces

The primary element is based on the following principles:

Gas or liquid filled bulbs

Bimetallic

Thermocouple

Resistance type

Infrared and other noncontact types

Thermistors

Semiconductors


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PDVSA K304


4.1.1 The preferred primary element is the 316 stainless steel sheathed 3wire platinumresistance type with DIN standard 43760 characteristic, Pt100.

a. Where temperatures measured are beyond the limits of a resistance type element,316 stainless steel sheathed ISA type thermocouples shall be specified.

b. Locally mounted transducers shall be used to eliminate long runs of thermocouplecompensation or resistance element cables. Transducers shall preferably bemounted integrally with the thermowell/measuring element assembly except inthe event of high vibration locations when the transducer shall be remotely locatedat a maximum distance of 2 metres from the thermowell.

c. Filled system primary elements shall be utilised for local indication, recordingand/or controlling function. These systems shall be fully compensated for ambienttemperature variations and errors due to capilliaries.

d. Bimetallic type elements shall be utilised for local indication only.

e. Infrared and other noncontact devices shall be specified on special applicationssubject to PDVSA approval.

4.1.2 All primary elements shall be installed inside thermowells. The only twoexceptions are:

a. Measurement of temperature in electric motor windings where the sheathedprimary element is adequate and measurement time delays due to thermowellsare not acceptable.

b. Pipe tube skin temperature measurement application where errors due tothermowells are not acceptable.

4.1.3 Single thermowell with multiple temperature measuring elements for installationinside reactors etc., shall be subject to PDVSA approval. The sheaths ofmeasuring elements shall be continously drawn and not seam welded type.

4.1.4 Where multiple thermocouple assemblies are required, e.g. for measuringtemperature at several levels in a reactor, they shall be assembled frommineralinsulated thermocouple elements of appropriate lengths, in a flexiblemetal sheath or bound together with a metal wire or mesh to form a compositeflexible assembly.


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PDVSA K304


The outside diameter of the individual thermocouples shall be adequate formechanical strength but sufficiently small to allow the complete assembly to becoiled to a radius of 1 metre for shipping and for flexibility during installation.

The thermocouples shall be supplied complete with flexible insulated tails ofthermocouple material. These shall end in a weatherproof connection boxcontaining a terminal block suitable for connecting the flexible tails tothermocouple signal cables having solid conductors of 1.2 mm diameter. Themechanical mounting of this box shall be appropriate to the type of thermowellbeing used.

4.2 Thermowells

4.2.1 Thermowells shall be fabricated from type 304 or 316 stainless steel solid barstock upto a maximum length of 36 inches.

a. Superior grades of materials shall be used consistent with the piping or equipmentspecification to resist the corrosive or erosion properties of the fluid. Ceramicthermowells for use in high temperature or furnace flue duct temperaturemeasurement applications are subject to PDVSA approval.

b. The primary element and the thermowell shall be procured as one completeassembly to ensure adequate fit and fast response of temperature measurement.

c. The thermowell O.D. shall be minimum and suit the specific applicationrequirement.

d. All thermowells shall be pressurised internally with an inert fluid at 1500 P.S.I.G.for 3 minutes and checked to ensure no leakage or deformation.

e. The material identification shall be clearly stamped on the thermowell in alocationvisible after installation.

4.2.2 The thermowell process connection shall be 1 N.P.T.M. or flanged consistentwith the piping or vessel specification and connection. The flange size shall be1 on piping and 11/2 minimum on vessels.


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PDVSA K304


1NPTM

LENGTH

LAGGING

CONNECTION

PROCESS

25mm

T

25mm

U

CONNECTION

INTERNAL

U

CONNECTION

PROCESS

Fig 3. TYPE SOLID BARSTOCK DRILLEDTHERMOWELLS

PARALLELTAPEREDOD

IDOD

ID


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PDVSA K304


4.2.3 The length of thermowell shall be 4 1/2 inches minimum below the 1 N.P.T.M.screwed connection and 12 inches below the flanged connection.

a. Consistent with the above the thermowell immersion length inside the pipe shallbe half of the nominal inside diameter of the line upto 20 inches. Above 20 inchesthe immersion length shall be a maximum of 12 inches.

Immersion length U INCHES

Pipe line size inches Screwed to be used onlywhen

permitted by piping spec.Flanged or RTJ

3(Smaller lines shall be swaged)

4 1/2 8

4 4 1/2 8

6 4 1/2 10

8 6 12

10 6 12

12 8 12

14 or greater 10 14

b. Where fluid velocity exceeds 50 feet per second the maximum immersion lengthshall be 6 inches.

c. Thermowells in temperatures greater than 600C and those installed in largevacant spaces such as radiant sections of furnaces shall be inserted from the topof equipment, rather than the side, in order to prevent sagging of the thermowelldue to high temperatures.

d. The thermowell location shall be 10 pipe diameters downstream of the junction oftwo streams of different temperatures.

e. Single thermowell with multiple measuring elements for installation inside reactorsetc. are special applications subject to PDVSA approval.


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PDVSA K304


4.3 Temperature Gauges

4.3.1 Gauges shall be bimetallic or filled system for mounting in specified thermowell.

4.3.2 Thermowell shall conform with guidelines in paragraph N 4.2.

4.3.3 The minimum dial diameter size shall be 4 inches (100 mm).

4.3.4 The case shall be weatherproof corrosion resistant to marine atmosphere.

4.4 Temperature Transmitters and Transducers

4.4.1 They shall be solid state electronic with 420 m.A. and digital transmissions.Pneumatic forcebalance, 315 P.S.I.G. output type shall only be used subject toPDVSA approval.

4.4.2 All transmitters / transducers shall be provided with integral output indicatorseither direct reading or 0100%.

4.4.3 The primary element shall be 3WIRE RESISTANCE bulb or ISA typethermocouple as specified.

4.4.4 Also see PDVSA specification K300, chapter 9.

4.5 Temperature Indicators / Recorders with or Without ControllersMounted in Field

4.5.1 The primary element shall be filled system type.


4.5.3 Blind temperature controllers shall not be used.

4.5.4 All controllers shall have automanual control facilities with bumpless transfer.

4.6 Temperature Indicators / Recorders with or Without ControllersMounted Inside Air Conditioned Control Room

4.6.1 The PDVSA preferred instrument is 420 m.A. or 315 P.S.I.G. receiver type.

However for applications with very short distances between the control room andthe thermowell direct connected primary element such as 3wire resistance bulbor ISA type thermocouple can be used subject to PDVSA approval.


4.6.3 All controllers shall have automanual control facilities with bumpless transfer.

4.7 Temperature Switches Filled System Type

Special notes:


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PDVSA K304


These types of switches shall be used on noncritical alarm applications onlyand their use is prohibited on protection system circuits.

The number of switches directly connected to process shall be minimum. Seespecification K336, paragraph 4.1.1. (c). Nevertheless where they areneeded they shall conform to the following details.

4.7.1 The primary element shall be filled system type.

4.7.2 Field mounted switches shall be weatherproof, corrosion resistant to marineatmosphere and shall withstand any specified corrosive ambience. The switchhousing shall conform to the appropriate area classification. Also see PDVSAspecification K300, chapter 9. Switch housing mounted inside air conditionedroom shall be manufacturers standard.

4.7.3 The switches shall be micro type rated for 1 AMP. at 24 volts D.C. All othervoltages shall be subject to PDVSA approval.

4.7.4 The switch differential shall be analysed to ensure compliance with all necessaryprocess operating conditions.

4.7.5 All switches shall have a scale with a red pointer to indicate switch setting. Tripsetting shall be tamper proof.

4.7.6 The switch shall be double pole double throw (D.P.D.T.) type with three wiresconnected to three terminals in order to select either a normally open (N.O.) ornormally closed (N.C.) action.

4.7.7 The maximum number of independent switches actuated by one temperatureelement shall be two. All applications involving two switches are subject to PDVSAapproval since in the event of failure of temperature element both switch functionsare lost.

Only one temperature element shall be located inside one case.

4.8 Self Acting Temperature Regulator

4.8.1 These shall only be used in noncritical and noncorrosive services such as inwater, inert gas or steam below 50 P.S.I.G.

4.8.2 The control valve shall comply with specification K332. Manufacturers standardconstruction is acceptable subject to PDVSA approval.

4.8.3 A local temperature gauge in accordance with paragraph 4.3 shall be installedadjacent to the desired point of temperature control.

4.9 Multi Point Temperature Indicator

4.9.1 This type of instrument has one common analog indicator or digital readout fora large number of thermocouple or resistance element inputs.


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PDVSA K304


4.9.2 The instrument range shall cover anticipated temperatures during startup,normal operations and process upset conditions.

4.9.3 The selector switch shall have gold or platinum base contacts, high contactpressure and nonlocking spring return to neutral type.

4.9.4 The instrument shall be solid state microprocessor type. Range, alarm settingsand scan time shall be programmable.

4.9.5 Alarm switches shall not be used on protective shutdown applications.

4.10 Multi Point Temperature Recorder

4.10.1 This type of instrument records a large number of thermocouple or resistance bulbinputs.

4.10.2 The instrument range shall cover anticipated temperatures during startup,normal operations and process upset conditions.

4.10.3 The instrument shall be solid state microprocessor type. Chart speed, range,alarm settings and scan time shall be programmable.

4.10.4 Alarm switches shall not be used on protective shutdown applications.

4.11 Tube Skin Thermocouples

4.11.1 Thermocouple material shall be type K.

4.11.2 Minimum wire size shall be 14 AWG (2.08 mm2).

4.11.3 Sheath shall be 1/2 in (13 mm) OD with a minimum wall thickness of 0.134 in (3.4mm), shaped to match the tube contour for about 1/4 of the tube circumference.

4.11.4 Retaining clips shall be provided to maintain sheath contact while allowingcircumferential movement.


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AUG.940

PDVSA K304


BY QUALIFIED WELDERS.

CL

LC

WELD T/C SHEATH

ONTO PLATE TO ENSURE

GOOD CONTACT.

Fig 4. TUBE SKIN THERMOCOUPLE DETAIL

ALL WELDING TO BE PERFORMED

NOTE:

TYPE K THERMOCOUPLE

PLATE AND PIPE

CONTACT BETWEEN

ENSURE CLOSE

TACKWELD TO

CLOSE CONTACT WITH PIPE

MILLIMETRES

NOT TO EXCEED 800

PREFORM PLATE TO ENSURE

1 x 1 x 1/4 THICK INCONEL PLATE

FURNACE WALL INTERIOR

HEAD

THERMOCOUPLE

L


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PDVSA K304


5 SPECIFICATION FORMS

FORM No. TITLE20.1 Receiver instruments

20.10 Millivolt/milliamp instrument

20.11 Filled system temp. instrument

20.12 Thermocouples and thermowells

20.13 Resistance temp. sensor and TWS

20.14 Bimetal thermometers and TWS

20.50 Control Valves

20.52 Self acting temperature regulator

The forms are included at the end of this specification.

6 INSTALLATION AND COMMISSIONING

All installation and commissioning shall be performed in accordance with projectdrawings and specifications.

7 Q. A. / Q. C.

All items shall conform with the procedures detailed in specification K369.


RECEIVER INSTRUMENTS

Item N Tag. N No. ofinputs

Notes:

20.1b

ScaleRanges

Service

PROJECT REFERENCEITEM N QUANTITY

SPECIFICATION REFERENCES I.S.A SPDVSAK

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 C85.11963, 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 automanual switching is not known or not adequate, specify particularrequeriments, such a BUMPLESS, PROCEDURELESS, 4POSITION, 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.


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AUG.940

PDVSA 20.1


p. All input signals on multichannel 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.


SINGLE/MULTIPLE INPUT MILLIVOLT/MILLIAMP INSTRUMENT

GENERAL

Notes: 1. All weatherproof and explosion 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 programmable.3. Programmable

CONTROL-LER

20.10a

XMTR/TRANSD.

Record Indicate Control Transducer

1. Tag N Service

2. Function

4. Mounting Flush Surface Other

3. Input Thermocouple ref. junction comp. J (IC)

Resistance bulb 3wire 4wire Calibration:

110 V 60 Hz 24 Volts D.C.



N By REVISED DATE

OFF SHEET OF

6. Power Supply

7. Chart Roll Fold Circular Range Speed: See Note 3

10. Output 420 mA 315 psig Other

inputoutput isolation

11. Control Modes P PI Other Reversible Action

Automan Switch Manual Reg Manual loading STN.

12. Set Point Adj. Manual Remote

13. Output 21103 kPa (315 psig)420 mA

15. Input open circuit

14. Switches Function on measurement input High Low High and Low

Rating 1 AMP. at 24 Volts D.C. see note 2No. of alarms

MFR 16. Model N

DownscaleUpscale Charts

Milliamps

PID

ALARMS

Single input Multiple inputs No. of inputs

K (CA) T(CC) Other

420 m.A. Power supplyThis inst. Ext.

Frequency/pulse Power supplyThis inst. Ext.

Safe area Classified Class Group Div

Weatherproof Ex. Proof Intr. safe STD.

Temp. Class T1 T2 T3 T4 T5 T6

5. Enclosure

8. Scale Range Direct Readout Multiple ranges Single

9. For multiple inputs Selector switches per note 3 Scan speed Seconds per point.

For receiver see sheet

Int. IllOPTION

SINGLE/MULTIPLE INPUT MILLIVOLT/MILLIAMP INSTRUMENT

Item N Tag. N Scale and Chart Range

Notes:

Individual

20.10b

Point No. Input typeService



N By REVISED DATE

OFF SHEET OF

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AUG.940

PDVSA 20.10


MILLOVOLT OR MILLIAMP INSTRUMENT SPECIFICATION SHEET INSTRUCTIONS

Prefix number designates line number on corresponding specification sheet.

1. To be used for single item. Use secondary sheet for multiple listing.

2. Check as many as apply.

3. Check one. Note that sheet may be used to specify galvanometric type ofinstrument.

4. Nominal size refers to approximate front of case dimensions: width x height.

5. It is assumed that the instrument has its own case or shelf suitable for singlemounting unless multicase is checked. Shelf or separable case for multiplecase mounting instrument is not included in this sheet unless listed as anaccesory.

6. Enclosure Class refers to composite instrument. If electrical contacts are in thecase, they meet this rating inherently or by reason of the enclosure. Use NEMAidentification system or ISA system presented in RP8.1.

7. Specify electrical power to entire instrument.

8. For multiple instrument list ranges on second sheet, but specify other itemshere.

9. Ranges 1 and 2 refer to multichannel instruments. The first listed is assumedto be the controller input (if any).

10. For multiple items list number of point on second sheet. Point Select permitsbypassing any or all points by a switching mechanism.

11. For multiple items show number of switches on second sheet under No. ofPoint.

12. Specify if applicable.

13. See explanation of terminology given on spec. sheet. Specific ranges of controlmodes can be listed under other if required.

14. For multiple items specify on second sheet.

15. If standard automanual swithching is not known or not adequate, specifyparticular requirements, such as BUMPLESS, PROCEDURELESS,4POSITION, or as required.

16. Remote set point adjustement assumes full adjustment range. Specify limitsif required.



19. Check if thermocouple input applies. Lead resistance required only forgalvanometer.


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AUG.940

PDVSA 20.10


20. Specify any input other than thermocouple. Calibration refers to curve usedand does not imply that element is specifically calibrated for this instrument.

21. Form may be SPST, SPDT, DPDT, etc. Rating is electrical rating of switch inamps.

22. Check if alarm is actuated by measured variable or by deviation from controllerset point. Give contact action if single throw form. Specify calibrated or blindalarm index setter.



25. Accesories for multiple items may be covered by notes second sheet.

26. May be filled in after selection is made.

SECONDARY SHEET for listing multiple instruments. List all instruments of thesame type, specified on Primary Sheet, with variations as shown. Notes refersto notes listed by number at the bottom of the sheet. Or use secondary Sheet tolist and identify the multiple points of a single multipoint instrument.


TEMPERATURE INSTRUMENTS (FILLED SYSTEM)

GENERAL

ELEMENT

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

CONTR

20.11a

XMTR

Record Indicate Control Trans Temp. Switch

1. Tag N Service

2. Function

4. Mounting Flush Surface Yoke

5. Enclosure Safe area Classified Class Group Div.

Weatherproof Ex. proof Intr. safe STD

110 V 60 Hz 24 Volts d.c.



N By REVISED DATE

OFF SHEET OF

6. Power Supply

7. Chart Circular SpeedSpring

9. Scale Range

DriveElec

1 2 3

10. Transmitter 420 mA 315 psig Other

11. Control Modes P PI Other Reversible Action

MFR.STD switch Manual Regulator

13. Set Point Adj. Manual Remote

14. Output 21103 kPa (315 psig)420 mA

17. Fill SAMA Class

Temp.: Min. Max. Max. Press

19. Range

18. Process Data

To Overrange

Type Mtl. Extension: Length20. Bulb Type

Length Mtl. Armor21. Capillary

22. Thermowell InsertionMtl. Lag. Ext.

Const: Process Conn.Drilled

23. Switches Function on meas. High and low Form: DPDT /amp. @ 24 v.d.c.

MFR 26. Model N

OPTIONS FiltReg.


PID

Other

ALARMS

Range

12. Automan

Protection to

Charts24. Options

Full compensation

No. of alarms

TEMPERATURE INSTRUMENTS (FILLED SYSTEM)

ItemN5

Tag. N5 Range LaggingExt.

CapillaryLength

Notes:

ThermowellProcess Conn.

20.11b

InsertionLength Notes



N By REVISED DATE

OFF SHEET OF

REVISION DATE



Page 1

AUG.940

PDVSA doc.20.11


TEMPERATURE INSTRUMENTS (FILLED SYSTEMS)

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. Enclosure class refers to composite instrument. If electrical contacts are in thecase, they must meet this classification inherently or by reason of enclosure.Use NEMA identification or ISA identification RP8.1.

6. Specify electrical power to the entire instrument from an external source.

7. Specify chart size, range and number applicable.

8. Chart drive mechanism assumed to be synchronous motor operating in 117V60 Hz and suitable for ENCLOSURE CLASS specified on line 5. If the chartdrive is pneumatic so state identify pneumatic pulser under options. Notedeviations from standard (MFR) under notes i.e., dual speed or special speeds.

9. The scale type may be SEGMENTAL VERTICAL, HORIZONTAL, DIAL(CIRCULAR) or other. Ranges 1, 2, 3 and 4 are used for multiple inputs. Thefirst listed (No. 1) is assumed to be the controller input, if a controller is used.

10. Specify transmitter output if applicable.

11. See explanation of terminology given on specification sheet. For furtherdefinition refer to American National Standard C85.11963, Terminology forAutomatic Control. Specific ranges of control modes can be listed afterOTHER, if, required.

12. For multiple items specify on second sheet.

13. If standard automanual switching is not known or not adequate, specifyparticular requirements, such as BUMPLESS, PROCEDURELESS,4POSITION, or as required.

14. Remote set point adjustement assumes full adjustment range. Specify limitsrequired.



17. Filled thermal systems can be of the following SAMA classification:


REVISION DATE



Page 2

AUG.940

PDVSA doc.20.11


Class 1A: Liquid filled, uniform scale, fully compensated.Class IB: Liquid filled, uniform scale, case compensated only.Class IIA: Vapor pressure, nonlinear scale with measured temperature

above case and tubing temperature.Class IIB: Vapor pressure, nonlinear scale with measured temperature

below case and tubing temperautre.Class IIC: Vapor pressure, nonlinear scale with measured temperature

above and below case and tubing temperature.Class IIIA: Gas filled, uniform scale, fully compensated.Class IIIB: Gas filled, uniform scale, case compensated only.Class VA: Mercury filled, uniform scale, fully compensated.Class B: Mercury filled, uniform scale, case compensated only.

18. Range refers to process input span for which an output is desired.Adjustable range means that the unit can give its normal output over arange of inputs.

19. Bulb type can be plain, averaging, rigid, adjustable union connections,fixed union connection. Capillary extension length can be rigid or flexible,etc.

20. Capillary tube specifications.

21. Well specifications.

22. Form may be SPST, SPDT, DPDT, etc. Rating is electrical rating of switchin volt amps.

23. Check if alarm is to be actuated by measured variable or by deviation fromcontroller set piont. Give contact action if single throw from.


THERMOCOUPLES AND THERMOWELLS

Notes: 1. All items shall be corrosion resistant to marine atmosphere and tropicalised.2. For remote mounted transmitter supply 2 metres cable with connectors between T/C head and instr.3 Thermocouple and thermowell assembly only.4 Special extension T/C leads protection for high ambient temperature.

20.12a

Thermocouple and thermowell onlyXMTRAND T/C

Element

Element length

Xinches

ItemN

Tag. N T/CType

Single Duplex

ProcessConnection

Uinches Notes

Thermowell DetailsType

S screwedF flanged

Tinches

T/C and T/W. complete with trans

Integral with T/C assembly

Safe area

420 m.A.d.c.

Type:

Remote from T/C assy. on yoke

Classified Class Group Div

1. Assy

2. Mounting

3. Enclosure

4. Output

5. I.S.A.

6. Thermowell

7. Notes

Sheathed O.D Material: 316 ST. ST

Other Powered ext.



Grounded Ungrounded Spring loaded Herm. sealed

Screw cap and chain Cond. conn. 1/2 N.P.T.F.

Material I.D. Shall suit sheath O.D.

Drilled Tapered StraightConstruction:

See notes 1 and 2 Notes 3 and 4 only applicable when specified



N By REVISED DATE

OFF SHEET OF

MFR 8. Model NSOLID BARSTOCK DRILLED

EXTENSIONLAGGING

CONNECTIONINTERNAL

T U

ODID

AND UNIONNIPPLE

ELEMENT LENGTH

CONNECTIONPROCESS

ODID

U

1 NPTMCONNECTION

PROCESS

CONNECTIONINTERNAL


Notes:

ItemN

Tag. N T/CType

Single Duplex

ProcessConnection

Uinches Notes

Element length

Xinches

20.12b


S screwedF flanged

Tinches



N By REVISED DATE

OFF SHEET OF

REVISION DATE



Page 1

AUG.940

PDVSA 20.12


THERMOCOUPLES AND THERMOWELLS

Reference: ANSI MC96.1, American National Standard for TemperatureMeasurement Thermocouples.

1. Check COMPLETE ASSEMBLY, or write in ELEMENT ONLY, ELEMENT &HEAD, etc.

2. Specify ISA type:

E Chromel/Constantan

J Iron/Constantan

K Chromel/Alumel

R Platium13 percent

Rhodium/Platinum

S Platinum10 percent

Rhodium/Platinum

T Copper/Constantan

and wire diameter in American Wire Gage (AWG), also known as Brown andSharpe Gage (B & S). Thermocouple wire normally runs from AWG No. 24(0.0201 in. dia.) through AWG No. 8 (0.1285 in. dia.).

3. Specify required construction by filling in sheath diameter and material, orchecking BEADED INSULATORS. Ckeck type of junction, EXPLOSED,ENCLOSED and GROUNDED, ENCLOSED and UNGROUNDED.

4. Specify nominal diameter of nipple, or NONE. Specify length N (as defined onsketch below line 8) if appropriate.

Check UNION if required.

5. Specify connection size and material of packed connector, and whether Fixedor Adjustable (for ceramic packed thermocouples only).

6. Specify general type of head.

7. Specify material of construction of head.

8. A duplex terminal block accomodates two thermocoulpes as listed. Refer toNotes.

9. Specify material of well or tube.

10. A builtup well has a welded tip. Check as many as apply.

11. Give dimensions if required.


REVISION DATE



Page 2

AUG.940

PDVSA 20.12


12. Process connection is external. However, INT will cover a thread dimension ifwell flange is threaded.

13. Fill in any applicable company standards or specifications.

Note: For thermocouples other than arrangement shown in sketch, space has been provided foryou to draw your own picture.

Tabulation: Fill in all applicable information. SINGLE/DULPEX, need only be filledin on line 8 if they are the same for all thermocouples on the sheet.


RESISTANCE TEMPERATURE SENSORS

ItemN

Tag. N RTDType

Single Duplex

ProcessConnection

Uinches Notes

Notes: 1. All items shall be corrosion resistant to marine atmosphere and tropicalised.2. For remote transmitter supply 2 metres cable with connectors between R.T.D. head and instr.3. R.T.D. and thermowell assembly only.4 Special extension leads protection for high ambient temperature.

Element length

Xinches

20.13a


S screwedF flanged

Tinches

XMTR

And R.T.D.

MFR

ELEMENT



N By REVISED DATE

OFF SHEET OF

RTD and thermowell only RTD and T/W. complete with trans

Integral with R.T.D assembly

Safe area

420 m.A.d.c.

Pt100

Remote from R.T.D. assy. on yoke

Classified Class Group Div

1. Assy

2. Mounting

3. Enclosure

4. Output

8. Model N

5. Type

6. Thermowell

7. Notes

Other 2wire

Other Powered ext.



Sheathed O.D. Material: Herm. sealed

Screw cap and chain Cond. conn. 1/2 N.P.T.F.

Material I.D. Shall suit sheath O.D.

Drilled Tapered StraightConstruction:

See notes 1 and 2 Notes 3 and 4 only applicable when specified

3wire 4wire

316 ST.ST.


EXTENSIONLAGGING

CONNECTIONINTERNAL

T U

ODID

AND UNIONNIPPLE

ELEMENT LENGTH

CONNECTIONPROCESS

ODID

U

1 NPTMCONNECTION

PROCESS

CONNECTIONINTERNAL


Notes:

ItemN

Tag. N RTDType

Single Duplex

ProcessConnection

Uinches Notes

Element length

Xinches

20.13b


S screwedF flanged

Tinches



N By REVISED DATE

OFF SHEET OF

REVISION DATE



Page 1

AUG.940

PDVSA 20.13


RESISTANCE TEMPERATURE SENSORS

Refer to Scientific Apparatus Manufacturers Association (SAMA) TentativeStandard on Resistance RC 5101955.

1. Complete assembly includes head, element, and well; as shown in sketch.

5. Give size and pipe schedule of nipple. Check if union is required.

7. The ice point resistance in ohms usually defines the resistance vs.temperature curve. If not, provide additional data as an attachment.

8. Give maximum range over which the elements will be used.

9. Specify sealing of leads.

11. This thread is on the element termination, not the well.

12. It is necessary to specify the number of wires, depending on thecompensation required. The other items refer to the element termination.

14. A builtup well has a welded tip and connection.

16. Internal thread of flange if well flange is threaded.

Instructions for the tabulation:

17. Process Connection is the connection on the element or well which isconnected to the pipe or vessel. Well dimensions are illustrated in thesketch. It is not necessary to specify Element Length if well dimensionsare already given. Single or Dual elements are assumed to be within thesame sheath. Refer to Notes by number or letter and explain in the spaceat the bottom of the form.


BIMETAL THERMOMETERS

Notes: 1. All items shall be corrosion resistant to marine atmosphere

20.14a

ThermometerGeneral

MFR

StemLength

ItemNo

Tag. N Range OperatingTemp

ProcessConnection

Uinches Notes


S screwedF flanged

Tinches

With Thermowell

Threaded

DiameterSTD

Union

0.25 in

1. Assy

2. Stem

3. Case

4. Dial

5. Scale

6. Form

7. Features

8. Thermowell

Adjustable any angle Fig. No

Other

Size Colour

Herm sealed case External calibrator

Material I.D. shall suit stem O.D.

Drilled

Process conn

Construction: Well length Shall suit stem length



N By REVISED DATE

OFF SHEET OF

Without T/W

Threaded 1/2 NPTM 3/4 NPTM

Material

0.375 in

MaterialSTD

Length Colour

9. Model No

DRILLED

PROCESSCONNECTION

OD

ID

OD

ID

SOLID BARSTOCK

CONNECTIONINTERNAL

(ANGLE)

BACK FORMFIG. 2

LENGTH

STEM

(STRAIGHT)FORMBOTTOMFIG. 1

LE

NG

TH

ST

EM

ST

EM

LE

NG

TH

UU


20.14b



N By REVISED DATE

OFF SHEET OF

Notes:

Rev. Tag. N Range OperatingTemp

NotesStem

LengthProcess

ConnectionU

inches


S screwedF flanged

Tinches

REVISION DATE



Page 1

AUG.940

PDVSA 20.14a



a. Specify mounting Forms termination of stem and write in stem materials orMFR.STD.

b. Select stem thread size.

c. Stem diameter standards may vary. Check specific size if this is important.

d. Write in case material if other than standard.

e. Write in nominal dial size and color.

f. Scale Length.

g. The form of the thermometer is illustrated on the form. The adjustable form maybe set to any angle. If a stem connection form other than shown is required, makea sketch in the space provided.

h. Check applicable options.

i. List specific make and model number when selection is made.

j. Specify how well is to be furnished, if any.

k. Specify well material. If not all are the same, cover exceptions by notes in thetabulation.

l. Specify well construction. Special well designs should be described by a sketchin the space provided or on an attached sheet.


REVISION DATE



Page 2

AUG.940

PDVSA 20.14a


TABULATION:

Tag N: It is assumed that a tag number represents a single item. Ifmultiple units have the same number, cover this with a specialnote.

Range: Write F or C at the top of the column. May be left blank oninitial issue if Operating Temp is specified.

Operating: Must be filled in if range is not specified.

Stem legth: Refer to illustrations on form.

Well Conn: Show thread size, such at 1 in. NPT or flange size and rating,such as 1 1/2 in. 150 lb. All flanges are assumed to be ANSIStandard; if not, cover by a special note.

Lag. Ext.: Applies to screwed wells only.

Notes: Index notes by number or letter and specify in space belowtabulation.


CONTROL VALVES

ProcessData

BODY

TRIM

NOTES

Tag No

NonFlashing Flashing Erosive Corrosive With solids

Service

Liquid


SPECIFICATION REFERENCES I.S.A S 75.01PDVSAK332

N By REVISED DATE

OFF SHEET OF

Gas Steam

UnitsService conditions

Maximum Normal Minimum

C.V.

PSIAK

Pipe line SizeInches INSULATION

Flow rateInlet pressure

TemperatureSpecific gravity or molecular WTViscosityCompressibility factorSpecific heat ratioCritical pressureFor flashing services only

IN

ClassdBNoise level

Required ANSI/FCI LeakageMax. Diff. pressure valve should withstand

C.V.

cPz

SCH OUT SCH

Type

SizeMfr & ModelBody/Bonnet MatlLinerEnd Conn.Flg Face Finish

Flow DirectionBonnetLub & Iso ValvePacking Material

Type

On/Off

Fail ActionWorking PressureBench Range

Input SignalTypeMfr. & ModelOn Incr Signal Output

Type

Mfr. & Model

Contacts/Rating

OrientationHandwheelAir Failure Valve

ACTUATOR

LIMIT SWITCHES

16

171920212224

25

26

272829

End Ext.

56

575862636465

6768

6970

74

75

76

30

32

33

34

Type

Size

Characteristic

Seats

Packing Type

7779

80

1

2

13

35

36

37

39

40

53

81

43

Pc Vapour pressure% FlashCalculatedCalculatedFour

Gas C.V. Liquid C.VSelectedSelected

Five Six (Bubble Tight)

Plug/Ball/Disk Matl.

Seat Material

Soft seat

Cage/Guide Material

Rated

Stem Material

38

Yes No Matl.

Yes No Matl.

Yes No

ANSI Class

Rated Travel

1 2 Balanced Unbal

Cv FL XT

Yes No Matl.

POSITIONER

Modulating Maintain Last Position

Open CloseMx. Min.

STD. OtherYes No Type

Yes No Set at

Actuation Points

Gauges ByPass

Incr Decr

Valve Open Valve ShutMfr. & Model

Set PressureSupply Pressure

Filter GaugesMx. Min.

AIR SET

1. NEC Class2. All items shall be corrosion resistant to marine atmosphere and tropicalised

Group Div. Intrinsically safe

20.50

In Out

Outlet pressure

REVISION DATE


INSTRUCTIONS TO FILL FORM 20.50

Page 1

AUG.940

PDVSA 20.50


CONTROL VALVES

Line Explanation of Terms and Definitions Examples

PROJECT Specify project name for which control valve is intended. XYZ Nuclear Ps

UNIT Specify unit within project. # 1

ITEM Specify item number of purchase order. 3

DATA SHEET Specify data sheet number. Normally assined by purchaser. 3 of 12

SPECIFICATIONREFERENCES

Specify number of technical specification on which valve selection is based. FL13265A

TAG Specify piping and instrumentation diagram number, loop diagram number,engineering flow diagram number, etc.

17453

FLUIDSERVICE Describe service of control valve and/or pipe line number.

Feedwater controlReheat spray

2 MA 1051 WA7

NOTE: The above lines are suggested only and may be modified to fit the individual companys needs. If the provided space isinsufficient, add an additional sheet and refer to it.

Line N Explanation of Terms and Definitions Examples

1 Describe fluid flowing into valve and its state. Indicate corrosive or erosiveservice and the corrosive or erosive agents.

Specify thermodynamic critical pressure of the fluid.

Superheated streamSaturated water

Crude oil and natural gas3206 psia

2Specify volumetric or mass flow rate at inlet or standard conditions. Maximumflow conditions, if greater than normal flow condition, is the condition for whichthe vave is sized.

300 gpm10000 bpd

600 std. m3/s7500 scfm300 kg/h

3 Specify inlet pressure (gauge or absolute) 5000 psig2000 kPa abs.

4 Specify outlet pressure (gauge or absolute) 1000 psig400 kPa gauge

5 Specify inlet temperature in F, R, C or K. Must agree wiht state of fluid.Identify the appropiate term.

750C200C815 K

6 Specify specific weight (in lb/ft3 or kg/m3), specific gravity, or molecularweight of fluid. Identify the appropiate term.

61,9 lb/ft31.0344.01

7 Specify viscosity in appropriate units for liquids or specific heats ratio forgases.

20 centiopoise17.8 centistokes

1.27


REVISION DATE



Page 2

AUG.940

PDVSA 20.50


8 Specify vapor (saturation) presure at inlet temperature in absolute units. Onlyrequired for liquid flow.

680 psia.46,9 bar abs.

Specify required Cv as calculated for each condition per ANSI/ISAS75.011986. No additional safety (oversize) factor should be included atthis point.

260

Specify laboratorymeasured allowable and predicted sound pressurelevels, both normally in dBA as measured per ISAS75.071987.

90/87 dBA

12 Extra line form infomation not covered in lines 1 through 11. Compressibily factor ZAmbient temperatue

13 & 14 specify size and schedule (or wall thickness if nonstandard) of pipe line intowhich valve is installed.

8 SCH 4015 OD x 0.500 wall

SN200, PN100

15 Specify pipe line insulation. This information is required for predicted soundpressure level calculations

2 thermalNone

16 Specify type of valve body.

Globe (through, angle)Split body

Double portButterfly

BallPinch

17 Specify nominal size of valve body. Specify ANSI class in accordance withANSI B16 3481

4600

2500 SPECIAL

18 Specify maximum pressure and temperature of the valve 2500 psig, 650F

19 Specify manufacturer and model number XYZ ControlsModel 7192

20 Specify body liner material Steel, ASTM 216,WCB

21 Specify body liner material, if any, and its inside diameter. Polyurethane, 3.9

22 & 23 Specify end connection. May be integral or welded onto body. 6 RTJ Class 1500 flangeButtweld end

2 FNPT

24 Specify flange face finish per ANSI B16.581 or special finish as required. ANSI B16.581Special finish:

32 RMS

25 Specify end extensions, if any. Normally, refers to sections of pipe or reducerswelded to the body by the valve manufacturer.

6 long, SCH 80,A106, GR. B

26 Specify direction of the flow through the body. FTO = flowtoopen, FTC =flowtoclose valve.

FTOFTC

NOTE: The descriptors FTO and FTC refer to the direction of fluid forces on the closure member. If immaterial, leave blank.When FTO and FTC are not applicable, specify direction as appropiate.

27 Specify type of bonnet StandardCooling finExtended

28 Specify whether a lubricator and isolation valve are requiredSpecify lubricant

YesSilicone

29 Specify packing material. Graphite impref. asbestosTPE

Nonasbestos


REVISION DATE



Page 3

AUG.940

PDVSA 20.50


30 Specify type of packing BraidedMolded Vring

Laminated filamentPressure/Vacuum

31 Extra line for special body or bonnet not covered in lines 16 through 30. Body drainSeparable flanges

Flangeless

32 Specify type of trim Single seat cageguidedMultistageMultihole

Topand bottomguideDouble seat

33 Specify nominal size and rated travel of installed trim 250 mm

34 Specify inherent flow characteristic of installed trim Linear Equal %

Modified parabolicQuick opening

35 Specify whether trim is balanced or unbalanced. Semibalanced trim shouldbe considered as balanced.

BalancedUnbalanced

36 Specify rated Cv, FL and XT of installed trim. Refer to ANSI/ISAS75.01 1986.

2600.90.68

37 Specify closure member, i.e., plug, ball, or disk material as applicable. 174 PH, H1150316

38 Specify seat material. 420 hardened316 hardfaced

39 Specify cage, bearing, or guide material. 410 hardened

40 Specify stem material 174 PH H1150316

41 & 42 Extra lines for additional trim requirements not covered in lines 32 through 40. ChromeplatePilotoperated

43 Specify hazardous location classification per the National Electrical Code ,ANSI/NFPA 701987

NEC Class 1, Div. 1, Group C

4452 Specify special requirements and/or accesories not covered elsewhere. Solenoid valves E/Ptransducer NACE MR0175

SeismicNet Weight = 275 lb

53 Specify type of actuator Diaphragm, pneumaticHydr. piston,

doubleactingPneumatic rotary vane

54 Specify manufacturer and model number. XYZ Controls P100160

55 Specify nominal size and effective diaphragm/piston area. 8160 square inch

0,2 m2

56 Specify whether actuator is for on/off of modulating service. ModulatingOn/off


REVISION DATE



Page 4

AUG.940

PDVSA 20.50


57 Specify whether spring/if any, acts to open or to close valve. OpenCloseNone

58 Specify maximum pressure for which the actuator is designed. 100 psig60 kPa

59 Specify minimum pressure required to fully stroke the installed valve underspecified conditions.

65 psig

60 & 61 Specify limits of avalable air or hydraulic suppli pressure. If upper limit isgreater than line 58, a reducing valve (air set) should be furnished. Lower limitor reducing valve setting must be higher than pressure shown on line 59.

90 psig/70 psig

62 Specify the pressures in the actuator when valve stars travel and at its ratedtravel position without fluid forces acting on the valve.

8/32 psig10/22 psig1,2/2,1 kPa

63 Specify orientation of actuator as VERT.UPor VERT.DOWN (vertical) orHORIZ. (horizontal). For rotary valves, also specify whether mounting isRH (righthand) or LH (lefthand) as viewed from valve inlet, ifappropiate. Specify additional information as appropriate or provide sketch.

VERT.UPHORIZ.

RHLH

64 Specify type and orientation of handwheel (manual override), if any. TopmountedSidemounted/LH

65 Specify if air failure valve (actuator air lockup valve) is required and at whatsupply pressure it shuts.

Yes40 psig

66 Extra line for additional actuator requirements not covered in lines 53 through65.

Hydraulic damperStroking speed

I/sec.Stainless steel tubing

67 Spedicy input signal range for full travel. 315 psig200100 kPa

420 mA

68 Specify type of positioner NoneSingle actingDouble acting

69 Specify manufacturer and model number. XYZ Control Co.Model AB

70 Specify whether an increasing signal increases or decreases outputpressure to actuator.

Incr.Decr.

71 Specify whether air pressure gauges and positioner are required. NoYes

72 Specify cam characteristic, if positioner has a cam. Normally linear LinearSquare root

73 Extra line for positioner requirements Aluminumfree

74 Specify type and quantity of limit switches Mech. (lever arm)Proximity

Pneumatic 2

75 Specify manufacturer and model number ABC Electric Co.Model A20Z

76 Specify electrical rating and number of contacts and action 10A, 600 VAC/DPDT

77 Specify valve travel at which switches are to actuate. Full open/full close

79 Specify manufacturer and model number of air set (pressure regulator) RBJ Co.Model R70


REVISION DATE



Page 5

AUG.940

PDVSA 20.50


80 Specify output pressure setting 70 psig20 psig

81 Specify whether filter and/or output pressure gauge is required. YesNO

83 Specify pressure of hydrostatic test. Normally per ANSI B16.3780 or API6A83.

3350 psig

84 Specify leakage class per ANSI/FCI 70276. Class IV

85 & 86

NOTES

Extra lines for additional test requirements not covered in lines 83 and 84. Hydro for 30 minutesHelium leak test

Stroking time testDead band test


SELFACTUATED TEMPERATURE REGULATORS

ProcessData

BODY

TRIM

NOTES

Tag No

NonFlashing Flashing Erosive Corrosive With solids

Service

Liquid


SPECIFICATION REFERENCES I.S.A S 75.01PDVSAK304

N By REVISED DATE

OFF SHEET OF

Gas Steam

Units

Service conditions

Maximum Normal Minimum

C.V.

PSIAK

Pipe line SizeInches INSULATION

Flow rateInlet pressure

TemperatureSpecific gravity or molecular WTViscosityCompressibility factorSpecific heat ratioCritical pressureFor flashing services only

IN

ClassdBNoise level

Required ANSI/FCI LeakageMax. Diff. pressure valve should withstand

C.V.

cPz

SCH OUT SCH

Type

SizeMfr & ModelBody/Bonnet MatlLinerEnd Conn.Flg Face Finish

Flow DirectionBonnetLub & Iso ValvePacking Material

Insertion Length

Capilllary MaterialArmorCapillary Length

Adjustable Range

Integral Thermometer

Well MaterialWell ConnectionU Dimension T Dim

ACTUATOR/PILOT16

171920212224

25

26

272829

End Ext.

20

21222324252627

282930

31

32

33

30

32

33

34

Type

Size

Characteristic

Seats

Packing Type

1

2

13

35

36

37

39

40

19

Pc Vapour pressure% FlashCalculatedCalculatedFour

Gas C.V. Liquid C.VSelectedSelected

Five Six (Bubble Tight)

Plug/Ball/Disk Matl.

Seat Material

Soft seat

Cage/Guide Material

Rated

Stem Material

38

Yes No Matl.

Yes No Matl.

Yes No

ANSI Class

Rated Travel

1 2 Balanced Unbal

Cv FL XT

Yes No Matl.

ACCESORIES

S20.52

In Out

MFR. Model No

1. All items shall be corrosion resistant to marine atmosphere

Bulb Connection

Fill: SAMA Class

Bulb MaterialExtension Length

16

1718

15

Bullb Type

Outlet pressure

REVISION DATE



Page 1

AUG.940

PDVSA 20.52


SELFACTUATED TEMPERATURE REGULATORS

1. Identification of item by tag number.

2. Process area or function.

3. Stream description and/or pipe size or vessel number with which valve is used..

4. Function heating or cooling.

5. Specify nominal size of body and trim in inches.

6. Single port (SP); 2. Double port (DP); 3. Threeway.

7. Specify screwed or flange rating and facing.

8. Specify material of body such as bronze, carbon steel, cast iron, etc.

9. Specify material of trim such as bronze, 316 stainless steel, etc.

10. State Characteristic:

L = Linear

LV = Linear V Port B = BlendingEP = Equal PercentageEPT = Equal Percentage TurnedEPB = Equal Percentage BalancedQ = Quick operating

Or use your own code and identify in notes.

11. Specify seat material such as 316 stainless steel, Buna N, etc.

12. Specify open or close.

13. Filled thermal system instruments are classified as follows:

Class IA: Liquid filled, uniform scale, fully compensated.Class IB: Liquid filled, uniform scale, case compensated only.Class IIA: Vapor pressure, increasing scale, with measured temp. above

case and tubing temp.Class IIB: Vapor pressure, increasing scale, with measured temp. below

case and tubing temp.Class IIC: Vapor pressure, increasing scale, with measured temp. above

and below case and tubing temp.Class IID: Vapor pressure, increasing scale, above, at, and below case and

tubing temp.Class IIIA: Gas filled, uniform scale, fully compensated.


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PDVSA 20.52


Class IIIB: Gas filled, uniform scale, case compensated only.Class VA: Mercury filled, uniform scale, fully compensated.Class VB: Mercury filled, uniform scale, case compensated only.

14. State whether plain, averaging, sanitary bulb.

15. Give material and type of bulb and extension; such as 316 SS.

16. Write in length of extension, adj for adjustable or rgd for rigid.

17. The bulb insertion length should be given if no well data are shown.

18. Specify size of jam nut or union connector; or part number.

19. Specify material of capillary tubing.

20. Specify material of armor (Bronze, 316 SS, etc.) or write None.

21. Specify length in feet.

22. Specify well material such as bronze, 304 stainless steel, 316 stainless steel,monel, etc.

23. Specify process connection size and type, such as 3/4 in. NPT, 1 1/2 in. 150 lbRF, etc.

24. Specify U dimension from face of thread to tip of well. Specify T (laggingextension) dimension in inches.

25. Note adjustable range available from the manufacturer.

26. Specify range, or write in None.

27. State liquid, steam, gas units gpm, lb/h/ft3/min. etc.

28. Name of fluid and state whether vapor or liquid if not apparent.

29. State maximum quantity required by process and corresponding Cv.

30. State operating quantity required by process and corresponding Cv.

31. The manufacturer shall fill in the valve Cv and FL (Liquid Pressure) RecoveryFactor without reducers or other accesories.

32. Operating inlet pressure and pressure differential with units (psia, psig, inchesH2O or Hg). Note at this point that one might consider how minimum conditionswill fit the sizing.

33. Maximum inlet pressure if different from normal.

34. State the maximum pressure drop in shutoff position to determine properactuator size. This is actual difference in inlet and outlet pressure stated in psi,inches of H2O or Hg, etc.

35. State F or C.

36. State operating specific gravity and molecular weight.


REVISION DATE



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AUG.940

PDVSA 20.52


37. State operating viscosity and its unit. State flash at valve outlet, i.e., of max flowthat will be flashed to vapor because of the valve pressure drop.

38. In the case of vapor, state superheat and in the cases of liquids, state the solids,if present.

39. Note vapor pressure of fluid as well as the critical pressure.

40. Give manufacturers predicted sound level dBA.

41. Complete when available.


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