P8451-TS-2000-J-0030_R0 Specification for Flow Orifice & Restriction Ori....pdf

8/10/2019 P8451-TS-2000-J-0030_R0 Specification for Flow Orifice & Restriction Ori....pdf

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ALL ISLAND


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UPPER ZAKUM 750K PROJECT

P8451-ACCOMMODATION & UTILITIES PROJECT (AUP)

P8451-TS-2000-J-0030 Specification for Flow Orifice & Restriction

Orifice Plate

Page 2 of 18 P8451-TS-2000-J-0030 Rev 0

TABLE OF CONTENTS

1 INTRODUCTION ........................................................................................................................................... 3

2 SCOPE .......................................................................................................................................................... 3

3 DEFINITION .................................................................................................................................................. 3

4 ABBREVIATIONS AND SYMBOLS ............................................................................................................. 4

5 INTERNATIONAL CODES & STANDARDS ................................................................................................ 4

6 ORDER OF PRECEDENCE ......................................................................................................................... 5 7 QUALITY ASSURANCE/QUALITY CONTROL REQUIREMENTS ............................................................. 6

8 GENERAL REQUIREMENTS ....................................................................................................................... 6

9 DESIGN REQUIREMENTS .......................................................................................................................... 7

10 MATERIAL REQUIREMENTS .................................................................................................................... 14

11 INSTALLATION/ COMMISSIONING REQUIREMENTS ........................................................................... 15

12 SURFACE PROTECTIVE COATING/ PAINTING ...................................................................................... 15

13 QUALITY ASSURANCE/ QUALITY CONTROL REQUIREMENTS .......................................................... 15

14 INSPECTION AND TESTING REQUIREMENTS ....................................................................................... 16

15 MARKING AND TRACEABILITY REQUIREMENTS ................................................................................. 16 16 HANDLING, STORAGE, PRESERVATION AND PACKING REQUIREMENTS ...................................... 17

17 SPARE PARTS ........................................................................................................................................... 17

18 QUOTING INSTRUCTIONS (TECHNICAL) ............................................................................................... 17

19 VENDOR DESIGN DATA ........................................................................................................................... 18


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P8451-TS-2000-J-0030 Specification for Flow Orifice & Restriction Orifice

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1 INTRODUCTION

The Upper Zakum offshore is located in the Arabian Gulf, 84km from Abu Dhabi. The field isdivided into four geographical island areas (Centre, North, South and West Islands) comprisingprocessing facilities on each plus three nearby platforms; South Satellite Platform (SSP), NorthSatellite Platform (NSP) and West Satellite Platform (WSP).

The Central Island will be located at a distance of 4km (approximately) from the Zakum CentralComplex Platform. The North and South Islands will be located at a distance of approximatelybetween 1 to 2 km from the existing North and South Satellite Platform respectively. Thedistance between the North/South Islands and Central Islands is anticipated to be 12 km(approximately).

In order to accommodate the Drilling, Operations, Logistics and other identified personnel onthe Islands at early stages of the project, COMPANY is providing Accommodation along withsupporting buildings and utilities. The provision of which will be undertaken initially on SouthIsland, then North Island and subsequently on Central and West Island.

This document defines the Flow Orifice & Restriction Orifice Plate which shall be supplied bythe VENDOR. The document outlines the basic technical features and general guidelines to befollowed for the design of Flow Orifice & Restriction Orifice Plate and provide the basis ofprocurement upon COMPANY approval.

2 SCOPE

2.1 The general technical requirements for Flow measurement using all types of Orifice Plates(such as concentric square edge, concentric quadrant edge or quarter circle, eccentric,conditioning Orifices etc.) are covered in this specification.

Note: Orifice flanges are Bulk Piping items and are part of Project Specification

P8383-TS-2000-P-0003: Piping Material Specification.

2.2 Orifice plates with Orifice fittings for use in in-situ replacement of Orifice plate are also coveredin this specification (i.e., Orifice Carriers).

2.3 In addition to Flow measurement Orifice Plates, specifications for Restriction Orifice Plates arealso included.

2.4 Specifications for other differential pressure primary elements such as Integral Orifices (for

small-bore pipe/ flow measurements).2.5 Sizing specifications are also included but the actual sizing is the responsibility of the vendor.

2.6 The Vendor shall meet the General and Specific technical requirements of the COMPANY inrespect of both materials and services.

2.7 Note: Orifice Plates and other differential Flow measurement elements (Flow Nozzle, Venturitube etc.) shall not be chosen for pulsating flows

3 DEFINITION

COMPANY : ZAKUM DEVELOPMENT COMPANY (ZADCO)

ENGINEER : Mott MacDonald, Abu Dhabi, UAEPROJECT : Upper Zakum 750K Project

CONTRACTOR : Organization nominated by company to perform EPC works.


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VENDOR /SUPPLIER/MANUFACTURER :

Firm or Company to who m the Purchase Order is issued tosupply the goods.

4 ABBREVIATIONS AND SYMBOLS

AGA American Gas Association

ASME American Society of Mechanical Engineers

API American Petroleum Institute

BS(I) British Standard (Institution)

DUpstream internal pipe diameter (or upstreamdiameter of a classical Venturi Tube) under workingconditions

EN Europisme Norme (European Standard)

FS Full scale

HART Highway Addressable Remote Transducer

ISO International Organization for Standardization

ISA International Society of Automation

NACE National Association of Corrosion Engineers

NDT Non-Destructive Testing

NPT National Pipe Thread

NPS Nominal Pipe Size

QA/QC Quality Assurance/ Quality Control

RF Raised Face

RTJ/ RJ Ring Type Joint/ Ring Joint

SPIR Spare Parts Interchangeability Record

VDRS Vendor Data Requirement Schedule

ZADCO Zakum Development Company

5 INTERNATIONAL CODES & STANDARDS

5.1 International Standards

INTERNATIONAL STANDARDS

ISO 5167-1Measurement of Fluid Flow by Means of Differential devices inserted incircular cross-section conduits running full Part 1- General principlesand requirements.

ISO 5167-2 Measurement of Fluid Flow by Means of Differential devices inserted incircular cross-section conduits running full Part 2- Orifice Plates


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5.2 HANDBOOKS

SHELL Flow Meter Engineering Handbook: SHELL International Petroleum Mij B.V.

Flow Measurement Engineering Handbook: Author- R.W. Miller

5.3 Project References

P8451-BD-2000-J-1160 Instruments & Controls Basis of Design

P8451-TS-2000-P-1131 Piping Material Specification (PMS)

6 ORDER OF PRECEDENCE

The following is the order of precedence in case of conflict: UAE Statutory Codes, Regulations & Standards. Design Basis (P8451 Project) P8451 Project Specifications

ISO TR 9464 Guidelines for the use of ISO 5167

ISO 9001 Quality Management System- Requirements

AMERICAN STANDARDS

ASME MFC-1M Glossary of Terms used in the Measurement of Fluid Flow inPipes

ASME MFC-3M Measurement of Fluid Flow in Pipes using Orifice, Nozzle andVenturi

ASME MFC-14M Measurement of Fluid flow using Small Bore Precision OrificeMeters

ASME B 1.20.1 Pipe Threads, General Purpose (Inch)

ASME B 16.5 Pipe Flanges and Flange Fittings, NPS through NPS 24

ASME B16.11 Forged fittings, Socket-welding and Threaded

ASME B16.20 Metallic Gaskets for Pipe Flanges Ring Joint, Spiral- Woundand Jacketed

ASME B16.21 Non-metallic Flat Gaskets for Pipe Flanges

ASME B16.36 Orifice Flanges

API RP 551 Process Measurement Instrumentation

AGA Report 3 Orifice metering of natural gas.

EUROPEAN STANDARDS

BS EN 10204 Metallic Materials Types of Inspection(Document on Material Testing & certification)BS 1042- Part 1and Part 2- 1981

Methods of measurement of fluid flow in closedconduits


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Data sheets COMPANY Standards and Specifications. International Codes and Standards.

In the event of any conflict between this specification, the codes and standards and otherspecifications mentioned herein, the most stringent shall apply.

7 QUALITY ASSURANCE/QUALITY CONTROL REQUIREMENTS

The Supplier shall maintain an effective Quality Management System and shall be certified tolatest edition of ISO 9001 Quality Management Standards.

The VENDOR shall submit their QA/QC procedure for information to COMPANY, clearlyindicating the test to be conducted, equipment to be used, detailed procedure and expectedperformance levels. Control of non-conformity, corrective action and its long-term effects, ifany, shall also be detailed. All the events and results shall be recorded.

It would be VENDOR responsibility to ensure all the inspection; test equipment is capable ofmeeting desired accuracy, precision and repeatability criteria.

All items shall be warranted against defective materials as required by Project specificationsbut in any case not less than 12 months in operation or 18 months from the date of shipment.Defective parts found within the guarantee period shall be replaced / repaired to permit theunits to perform to design conditions.

8 GENERAL REQUIREMENTS

8.1 Standard Sharp Square edge Orifice Plates and other differential pressure type Flowmeasurement elements shall be sized, designed, engineered and fabricated generally inaccordance with or traceable to ISO 5167, ASME MFC-3M, AGA Report 3 and R.W.MillersFlow Measurement Engineering Handbook.

8.2 Quarter Circle Orifice Plates and Eccentric Orifice plates shall be sized, designed, engineeredand fabricated generally in accordance with or traceable to BS-1042: Section 1. 2-1989 orhandbooks by R.W. Miller or SHELL.

8.3 Restriction Orifices shall be sized, designed, engineered and fabricated generally inaccordance with the associated Instrument data sheet based on the guidelines given in thehandbooks by R.W.Millers or SHELL.

8.4 Honed flow Orifice meters with pre-fabricated meter runs shall be designed, engineered andfabricated generally in accordance with handbook by SHELL or as per ASME MFC-14M.

8.5 Integral Orifice meters shall be sized, designed, engineered and fabricated to ASME MFC-14Mor to manufacturers standard, as specified in associated Instrument data sheet.

8.6 Segmental Orifice plates shall be sized, designed, engineered and fabricated generally inaccordance with the handbook of R.W. Miller.

8.7 For purposes of sizing, Inherent Rangeability of Conventional DP Transmitters to be used withFlow elements shall be taken as 3:1 for critical measurements and closed loop controlmeasurements and shall be considered as 5:1 for open loop monitoring measurements.Separate High and Low range transmitters (up to a maximum of three transmitters) shall beused to extend the rangeability.The Inherent Rangeability may be extended to 6:1 (or higher) with the use of SmartMicroprocessor based (D.P.) Transmitters but the rangeability shall be verified for suchapplication.


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8.8 Paddle or handle type Orifice plates shall be supplied. Disc type Orifice shall be supplied onlyfor use with Orifice Carrier fittings.

8.9 Orifice flanges with differential pressure tapping connections shall be as per ASME B 16.36.Normal Orifice flanges without pressure differential tapping connections shall be supplied asper ASME B16.5.

8.10 Spare taps on Orifice flanges shall be plugged with a design pressure rated plug.

8.11 Flow Orifice & Restriction Orifice plate and flanges shall be designed to have a minimum lifeexpectancy of thirty years.

8.12 ENVIRONMENTAL DATA

The Environmental Conditions shall be as per Project Specification for General EnvironmentalData and Units of Measurement for ZADCO Onshore and Offshore Facilities (P8383-BD-2000-G-0002) and Instrumentation Design Basis.

9 DESIGN REQUIREMENTS

9.1 SELECTION BASIS

9.1.1 Square Edge Orifice with flange differential pressure connections shall only be used for 2 to12 NPS pipe.

9.1.2 Concentric Thin Sharp Square Edge Orifice with flange differential pressure connections andwith pre-fabricated honed or reamed meter runs shall only be used for 1-1/2 to 2 NPS pipe.

Pre-fabricated meter runs may also be used for improved accuracy for 2 NPS pipe size.9.1.3 Concentric thin Sharp Square Edge Orifice plates with D & D/2 taps shall be used for 12 to

18 NPS pipe sizes.

Note: In D-D/2 tapping, upstream tap location is distance D and downstream tap is distanceD/2 from the Orifice plate.

9.1.4 Integral Orifice Meters shall be used for 1 and below NPS pipe fluid flow measurement.

9.1.5 Concentric Quarter-circle or Quadrant Edge Orifice plates shall be used for viscous fluids orlow Reynolds number flows.

Note: Quarter circle or Quadrant edge Orifice plates shall be used when the calculated PipeReynoldss number is below 10,000 or when the metered fluid has viscosity 20cP or higher,provided that the flow is not laminar or transitional (i.e. where the flow maintains the squareroot relationship to the differential pressure drop) for the full flow range.

9.1.6 Concentric Thin Sharp Square Edge Orifice plates with corner taps on carrier-ring shall beused for averaging flows on low velocity air/ gas or for viscous fluids with low Reynolds numberflows in 1-1/2 to 2 NPS pipe.

9.1.7 Eccentric or Segmental Orifice plates shall be used for horizontal Orifice runs handling fluidswith trace suspended solids/ sedimentation.

9.1.8 For Bi-directional flow, concentric thin Sharp Square Edge Orifice plates (with a sharp edge onboth the upstream and downstream side of the Orifice plate) with flange taps shall be used.

9.1.9 For lower permanent pressure loss than that given by Orifice plate for Liquids flows may beused.

9.1.10 Vena Contracta Pipe Taps or Conical Entrance Orifice plates shall only be used for proprietaryguarantee reasons or when other methods are found unsuitable.


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9.1.11 Ideally, a Beta ( ) ratio between 0.2 and 0.7 are recommended for minimum uncertainties forOrifice plates. The sizing requirements for each type of Differential Pressure Flow Element areincluded under the respective clauses of this specification.

9.1.12 However, limits of use shall be as per ISO 5167-Part 1, 2, 3 and 4, and AGA Report 3, asapplicable.

9.1.13 Pipe roughness considerations shall be as per ISO 5167-Part 1 (or) AGA Report 3, unlessotherwise stated in associated Instrument data sheet.

9.1.14 Pressure loss calculations shall be traceable to the more rigorous equation of ISO- 5167 ratherthan the approximate equation.

9.2 CONCENTRIC SQUARE EDGE ORIFICE PLATES9.2.1 Sizing

a) Sizing for concentric sharp square edge orifice plates (also called as Standard Orifice plate) shallbe traceable to ISO-5167 Part 1 or AGA Report 3 or R W Millers handbook. Sizing shall beperformed using INTOOLS. A calculation printout and data sheet printout shall be submitted foreach Orifice plate.

b) Alternatively, Manufacturers sizing programs are acceptable provided that the conformance andtraceability to ISO-5167/ AGA Report 3/ R.W.Millers Handbook is certified. SHELL program forFlow sizing is also acceptable, provided it is an authorized copy of the latest revision. The use ofsuch alternatives may require written approval by the COMPANY.

c) Natural gas flow measurements shall also take into account limiting factors as per AGA ReportNo.3 /API-MPMS14.3.2: Manual of Petroleum Measurement Standards- Natural Gas FluidsMeasurement using Concentric Square-Edged Orifice Meters, Specification and InstallationRequirements.

d) Bore diameter shall be in mm only and shall be rounded off to the nearest 0.1 mm for values up to25 mm and to nearest 1 mm above 25 mm. Minimum bore diameter shall be greater than 12.5 mm.

e) Meter maximum flow shall be selected so that normal design flow is about 70 % of scale, while atthe same time maximum design flow shall be at about 90 % of scale.

f) Standard differential pressure range shall be 2500 mm H2O. Other ranges such as 500 mm H2O,1250 mm H2O, 5000 mm H2O and 10000 mm H2O may be selected. However, range below 125mm H2O and higher than 10000 mm H2O shall not be selected.

Note: The industry rule-of-thumb for ensuring that the expansion co-efficient for compressiblefluids (gas, vapour and steam) is within limits is that differential pressure range in inches ofwater column shall not numerically exceed the inlet static pressure in psi absolute or Ratio ofdifferential pressure span to upstream static pressure, both measured in same engineeringunits, shall be below 0.25. This may be used for quick preliminary choice of differentialpressure range.

g) Standard Bore diameter and non-standard differential pressure ranges may be accepted by theCOMPANY but the preference is to avoid non-standard ranges due to resultant complicated scalemultipliers and possible errors in conversions, besides the loss of standardization.

Note: It is recognized that standard bore diameter with non-standard D.P. ranges are not amajor constraint when the BPCS (Basic Process Control System) is based on Digital controlsystems with Smart transmitters.

9.2.2 Uncertainty in Measurement


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Performance characteristics calculations (at installed conditions) shall be traceable to ISO-5167Part 1and 2 in line with uncertainty evaluation method detailed in ISO TR 5168: Measurementof Fluid Flow Evaluation of Uncertainties, for fabrication as per ISO 5167 and standardmeasurement assumptions. AGA Report No. 3 Part 1/ API MPMS 14.3.1 may also be referredfor evaluating uncertainties.

Absolute Uncertainty exceeding 1.5 % shall be a cause for re-evaluation of sizing andselection of primary element.

Accuracy for elements calibrated in manufacturers or other accredited flow laboratory whenspecified for select tags shall be 0.25 % flow range or better.

9.2.3 Fabrication

a) Only paddle type (handle type) Orifice plates shall be provided. The paddle/handle shall be anintegral part of the plate. When the paddle/ handle are welded to the Orifice plate, the welding shallbe a full penetration joint (and not a tack welded joint).

b) Fabrication and machining tolerances shall be per ISO-5167 Part 2 or AGA Report No. 3 Part 2,unless otherwise specified. The paddle/handle may be to the manufacturers standard methodology.

c) Bevel angle shall be 45.

d) Orifice plate thickness shall generally be selected as per the following table while at the same timemeeting the minimum criteria specified in ISO-5167 Part 2. Guidelines for thickness calculation asspecified in AGA Report 3 Part-2, or R.W. Millers handbook shall also be referred whereverapplicable.

PIPE SIZE (NPS) IN INCHES (INCLUSIVE) PLATE THICKNESS

1-1/2 to 4 3 mm (1/8)

6 to 10 6 mm (1/4)

12 to 14 10 mm (3/8)

16 to 18 12 mm (1/2)

e) Each Orifice plate shall have a Vent hole for Liquid service or Drain hole for Gas service (whenspecified in the associated Instrument data sheet) for 2 NPS or larger pipe sizes with Orifice boregreater than or equal to 19 mm (0.75):

Liquid service vent: 1/8 (3.2 mm), minimum.

Steam / Gas Service drain: 1/16 (1.6 mm), minimum.

Vent/drain hole size shall be less than 1/10 th of the actual orifice bore in order to ensure thateffect on measurement due to Vent/Drain hole is negligible.

Correction for bore diameter shall be as per BS-1042-1981 or handbook by R.W.Millers.

f) For bi-directional Orifice plate, the downstream face shall not be beveled and shall be prepared tothe same specifications as the upstream face.

9.3 CONCENTRIC QUADRANT EDGE (QUARTER CIRCLE) ORIFICE PLATES9.3.1 Sizing


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a) Sizing (& discharge co-efficient) shall be traceable to BS-1042: Section 1.2- 1989 edition (althoughdeclared withdrawn but still in use in industry) or SHELL handbook. Sizing shall be performed usingINTOOLS. A calculation printout and data sheet printout shall be submitted for each Orifice plate.

Alternatively, Manufacturers sizing programs are acceptable provided that the conformance andtraceability to BS-1042-1.2 1989 is certified. SHELL program for Flow sizing is also acceptable,provided it is an authorized copy of the latest revision. The use of such alternatives may requirewritten approval by the COMPANY.

b) Bore diameter shall be in mm only and shall be rounded off to the nearest 0.1 mm for values up to25 mm and to nearest 1 mm above 25 mm. Minimum bore diameter shall be greater than 12.5 mm.

c) Meter maximum flow shall be selected so that normal design flow is about 70 % of scale, while at

the same time maximum design flow shall be at about 90 % of scale.d) Standard differential pressure range shall be 2500 mm H2O. Other ranges such as 500 mm H2O,

1250 mm H2O, 5000 mm H2O and 10000 mm H2O may be selected. However, range below 125mm H2O and higher than 10000 mm H2O shall not be selected.

Note: The industry rule-of-thumb for ensuring that the expansion co-efficient for compressiblefluids (gas, vapour and steam) is within limits is that differential pressure range in inches ofwater column shall not numerically exceed the inlet static pressure in psi absolute or Ratio ofdifferential pressure span to upstream static pressure, both measured in same engineeringunits shall be below 0.25. This may be used for quick preliminary choice of differential pressurerange.

e) Standard Bore diameter and non-standard differential pressure ranges may be accepted by theCOMPANY but the preference is to avoid non-standard ranges due to resultant complicated scalemultipliers and possible errors in conversions, besides the loss of standardization.

Note: It is recognized that standard bore diameter with non-standard D.P. ranges are not amajor constraint when the BPCS (Basic Process Control System) is based on Digital controlsystems with Smart transmitters.


Performance characteristics calculations (at installed conditions) shall be based on theguidelines of BS-1042-1.2 1989, ISO-5167 Parts 1 and 2, in line with uncertainty evaluationmethod detailed in ISO TR 5168: Measurement of Fluid Flow- Evaluation of Uncertainties.

9.3.3 Fabrication

a) Only paddle type (handle type) Orifice plates shall be provided. The paddle/handle shall be anintegral part of the plate. When the paddle/handle is welded to the Orifice plate, the welding shall bea full penetration joint (and not a tack welded joint).

b) Fabrication and machining tolerances shall meet or exceed the requirements of ISO 5167-2, BS-1042-1.2 1989, unless otherwise specified. The paddle/handle may be to the manufacturersstandard methodology.

c) Thickness of the orifice plate shall be as per ISO 5167-2. Guidelines for thickness calculation asspecified in AGA Report 3 Part 2, or R.W.Millers handbook shall also be referred whereverapplicable.

d) Orifice plate shall be provided with a Vent hole for Liquid service or Drain hole for Gas service shallbe provided when specified in the associated Instrument data sheet for 2 NPS or larger Orifice.Vent/Drain hole size shall be less than 1/10th of the actual orifice bore in order to ensure that effecton measurement due to Vent/Drain hole is negligible.

Liquid service vent: 1/8 (3.2 mm), minimum.


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Steam / Gas Service drain: 1/16 (1.6 mm), minimum.

Correction for bore diameter shall be as per BS-1042-1.2 1989 or handbook by R.W.Millers.

9.4 ECCENTRIC ORIFICE PLATES

9.4.1 Sizing

a) Sizing (& discharge co-efficient) shall be traceable to R.W.Millers handbook or BS-1042- 1.2: 1989edition (although declared withdrawn but still in use in industry). Sizing shall be performed usingINTOOLS or any standard sizing software such as Instru calc. etc,. A calculation printout and datasheet printout shall be submitted for each Orifice plate.

Alternatively, Manufacturers sizing programs are acceptable provided that the conformanceand traceability to BS-1042-1.2 1989 or R.W.Millers Handbook is certified. SHELL program forFlow sizing is also acceptable, provided it is an authorized copy of the latest revision.

b) Bore diameter shall be in mm only and shall be rounded off to the nearest 0.1 mm for values up to25 mm and to nearest 1 mm above 25 mm. Minimum bore diameter shall be greater than 12.5 mm.

c) Meter maximum flow shall be selected so that normal design flow is about 70 % of scale, while atthe same time maximum design flow shall be at about 90 % of scale.

d) Standard differential pressure range shall be chosen from the following ranges: 500 mm H2O, 1250mm H2O, 2500 mm H2O, 5000 mm H2O and 10000 mm H2O may be selected. However, rangebelow 125 mm H2O and higher than 10000 mm H2O shall not be selected.

e) Standard Bore diameter and non-standard differential pressure ranges may be accepted by theCOMPANY but the preference is to avoid non-standard ranges due to resultant complicated scalemultipliers and possible errors in conversions, besides standardization.

Note: It is recognized that standard bore diameter with non-standard D.P. ranges are not amajor constraint when BPCS (Basic Process Control System) is based on Digital control systemwith Smart transmitters.


Performance characteristics calculations (at installed conditions) shall be based on theguidelines of BS-1042-1.2 1989, ISO-5167 Parts 1 and 2, in line with uncertainty evaluationmethod detailed in ISO TR 5168: Measurement of Fluid Flow- Evaluation of Uncertainties.Guidelines for Uncertainty evaluation as specified in R.W.Millers handbook shall also bereferred wherever applicable.

9.4.3 Fabrication

a) Only paddle type (handle type) Orifice plates shall be provided. The paddle/handle shall be anintegral part of the plate. When the paddle/handle is welded to the Orifice plate, the welding shall bea full penetration joint (and not a tack welded joint).

b) Fabrication and machining tolerances shall meet or exceed the requirements of ISO 5167-2, BS-1042-1.2 1989, unless otherwise specified. The paddle/handle may be to the manufacturersstandard methodology.

c) Orifice plate thickness shall generally be selected as per the following table while at the same timemeeting the minimum criteria specified in ISO-5167 Part 2. Guidelines for thickness calculation as


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specified in AGA Report 3 Part-2, or R.W.Millers handbook shall also be referred whereverapplicable:

PIPE SIZE (NPS) IN INCHES (INCLUSIVE) PLATE THICKNESS

1-1/2 to 4 3 mm (1/8)

6 to 10 6 mm (1/4)

12 to 14 10 mm (3/8)

16 to 18 12 mm (1/2)

9.5 RESTRICTION ORIFICE PLATES

9.5.1 Sizing

Restriction Orifice plates shall be sized as per R.W.Millers Flow Measurement EngineeringHandbook or the SHELL Flow Meter Engineering Handbook.

9.5.2 Fabrication

a) Single stage Restriction Orifices shall be provided with paddle/handle. The paddle/handle shall bean integral part of plate. When the paddle/handle is welded to the Orifice plate, the welding shall bea full penetration joint (and not a tack welded joint).

b) Fabrication and machining tolerances shall be per ISO-5167 Part 2 or AGA Report 3 Part 2, unlessotherwise specified. The paddle/handle may be to manufacturers standard methodology.

c) Restriction Orifice plate thickness calculation shall be performed as per the guidelines ofR.W.Millers or SHELL handbooks. Thickness calculation shall take into account maximumallowable deflection, bending stress, shear stress of the plates.

9.6 CONDITIONING ORIFICE PLATE

9.6.1 Conditioning Orifice plates (Orifice plates with multiple holes) are a proprietary product ofRosemount Division of Emerson Process Management.

Sizing of Conditioning Orifice plate is based on Emerson Process Managements softwareInstrument Toolkit and manufacturing details like distribution of holes on the plate is all basedon proprietary information. Conditioning Orifice shall only be used in non-critical applications.The main advantage of using Conditioning Orifice plates is that straight lengths requirementsare drastically reduced as compared to Standard Orifice plates.

9.6.2 Sizing

Sizing of Conditioning Orifice plate is based on Emerson Process Managements softwareInstrument Toolkit. Meter Maximum Flow shall be selected so that normal design flow is about70% of scale; while at the same time maximum design flow shall be at about 90% of scale.

Standard differential pressure range shall be 2500 mm H2O. Other ranges such as 500 mmH2O, 1250 mm H2O, 5000 mm H2O and 10000 mm H2O may be selected. However, rangebelow 125 mm H2O and higher than 10000 mm H2O shall not be selected.

Standard Bore diameter and non-standard differential pressure ranges may be accepted butpreference is to avoid non-standard ranges due to resultant hard scale multipliers and possibleerrors in conversions, besides standardization.



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Uncertainty in measurement shall be as low as possible and to the Manufacturers statedstandard.

9.6.4 Fabrication

Paddle type (handle type) Orifice plates shall only be provided. The paddle/handle shall be anintegral part of the plate. When the paddle/handle is welded to the Orifice plate, the weldingshall be a full penetration joint (and not a tack welded joint) Orifice plate thickness shall be asper the Manufacturers stated standard. The Orifice plate thickness calculation requirementsspecified in ISO-5167 Part 2, AGA Report 3 Part-2 and R.W.Millers handbook shall also bereferred.

9.7 INTEGRAL ORIFICE METERS

9.7.1 Uncertainty of Integral Orifice meters shall 5.0 % Full Scale or better.

9.7.2 Orifice bore sizing shall be as per ISO-5167-2 or AGA Report 3 or R.W.Millers handbook orSHELL handbook.

9.7.3 Fabrication shall be to the manufacturers standard.

9.8 ORIFICE FLANGES, PLATE HOLDERS AND ORIFICE FITTINGS

9.8.1 Orifice Flanges

Flanges for Orifice plates for measurement purposes shall be weld neck type fabricated toASME B 16.36, unless otherwise specified in data sheet. Pressure ratings, Marking,

Dimensions, Jackscrew (Jack bolt) and its orientation details & tolerances shall be as per ASMEB16.36, unless otherwise specified in data sheet.

Knockout type alignment dowel pin for centring the Orifice plate shall be provided for OrificeFlanges, if specified in data sheet.

9.8.2 Plate Holders

For RTJ flanges, Octagonal (Orifice) ring holder shall be provided with an integral Single pieceOrifice or Orifice fixed by hold-down screws. Vendor shall highlight any use of angular metertaps (as required by ISO 5167-2 for Orifice of certain sizes and rating) in his documentsubmittals. API ring number shall be as specified in the associated Instrument data sheet.

9.8.3 Carrier rings with corner taps

Carrier rings with corner taps shall be fabricated in accordance with the associated platefabrication standard (ISO 5167, BS-1042 etc.).

9.8.4 Orifice Carriers

a) Dual (chamber) compartment type Orifice Carriers that allow removal of the plate under linepressure without the need for line isolation shall be provided wherever process parameters andmeasurement demands more than one Orifice plate.

b) Bubble tight seating/sealing between upper and lower chambers shall be maintained up tomaximum working pressure.

c) Flanged Orifice Carriers are preferred over weld neck fittings, unless their use is prohibited by thepiping class requirements in the Project Piping Material Specifications.

d) The Orifice Carrier shall be supplied complete with Slide valve assembly, Plate carrier, Double rackand pinion for raising and lowering along with wrench system, slide valve indicator plate, shaftpacking, centering ring, grease gun, equalizer and bleeder valves, drain plugs, slide valve lubricantsupply, etc. Vendor shall ensure that the materials of construction meet the process conditions


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specified in the associated Instrument data sheet and shall provide a complete Bill of Material in thebid.

e) Orifice plate seal shall be the dual seal Teflon type, unless otherwise specified in the associatedInstrument data sheet. Bubble tight soft seat seal shall be provided on all gas service installations.

f) Orifice Fitting soft materials of construction shall be suitable for a temperature range of Minus 15 Cto 250 C, unless otherwise specified in the associated Instrument data sheet.

g) All moving parts (including slide valve assembly) shall be designed so that they may be replaced orrepaired without removing the Carrier from the line.

h) It shall be possible for a single person to operate the unit and change the plate under normal flowconditions.

i) The slide valve shall be manufactured from hardened stainless steel. It shall not be possible to closethe slide valve unless the Orifice is correctly mounted and concentric with the bore of fitting.

j) The plate carriers shall be centered using a positioning system (minimum three point alignment) thatassures concentricity within the fitting.

k) Hydrostatic testing shall be in accordance with ANSI B 16.34, unless otherwise specified in theassociated Instrument data sheet.

l) The dual seal shall positively seal against both outer faces of the plate and against both seats of theOrifice Carrier to prevent leakage. Other type of seal required for the stated process conditions (e.g.a rating above ASME class 900) or where appropriate dual seal material is not available (e.g. whereTeflon seal is not suitable) shall be reviewed and recommended by the Vendor and approved by theCOMPANY.

m) The Plate Carrier shall allow inspection of plate without having to remove the plate from the carrier.

9.9 AUXILIARIES AND ACCESSORIES

9.9.1 Meter Runs (pre-fabricated) shall only be used in place of commercial pipes for the upstreamand downstream straight length runs with end flanges for:

a) Pipe sizes below 1-1/2 NPS (2 is possible but requires COMPANY approval).

b) Custody transfer applications. .

c) Critical flow measurement applications and LPG/LNG service.

d) Prefabricated meter run complying with the requirements of ISO 5167.

9.9.2 Flow Straighteners

Flow Straighteners (with end flanges) shall comply with the requirements of ISO 5167.

Flow conditioner plates shall not be provided unless specified in the associated Instrument datasheet. Flow conditioner plates may be considered for applications handling abrasive fluids orflow in buried meter tubes and in tubes with condensate problems.

10 MATERIAL REQUIREMENTS

10.1 Differential Pressure Flow Elements Materials of construction requirements shall meet therequirements as specified in the Project specification P8383-TS-2000-J- 0015 InstrumentMaterial Selection (INMS) and the associated Instrument data sheets.

10.2 Materials of construction requirements shall also meet the requirements as specified in theProject Specification, Piping Material Specification (PMS), P8383-TS-2000-P- 0003.


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10.3 Integral Orifice meter wetted parts shall be SS316/ SS 316L as a minimum, unless otherwisespecified in the associated Instrument data sheet.

10.4 Wetted parts materials shall comply with requirements of ISO 15156/ NACE MR01- 75, whenspecified in the associated Instrument data sheet.

10.5 The gaskets shall be non-asbestos and suitable for the process fluids at service conditionsspecified in the associated Instrument data sheet.

10.6 Teflon Gaskets shall be used (as a minimum) with other material selected as necessary basedon the service conditions specified in the associated Instrument data sheet.

11 INSTALLATION/ COMMISSIONING REQUIREMENTS

11.1 Upstream and downstream straight length runs and other installation details shall meet orexceed the requirements of ISO 5167 or ASME MFC-3M or AGA Report 3 Part 2, as applicable.The Vendor shall furnish details for various piping configuration options, when requested, toimprove the flow measurement un-certainty.

12 SURFACE PROTECTIVE COATING/ PAINTING

12.1 Unless otherwise specified, the protective coating and painting shall be as per the Projectspecification P8383-TS-2000-Y-0020: Addendum to Protective Coating System for exterior ofOrifice Flanges, Orifice Fittings and Pre-fabricated Meter Runs on coating requirements foradjacent piping and the (sub-) specification number shall be as identified in the Projectspecification or the associated Instrument data sheet.

12.2 For other items specifically not addressed in the above specification, painting shall be to themanufacturers standard. Vendor shall submit his painting procedure for approval by theCOMPANY, prior to manufacture.

12.3 Items shall be painted for installation in a highly corrosive, humid, salt laden marineenvironment.

12.4 Vendor painting procedure shall ensure the highest quality of painting at each stage of thepainting to ensure that the finished product is highly durable and suitable for the harsh marineenvironment in which it will be installed.

13 QUALITY ASSURANCE/ QUALITY CONTROL REQUIREMENTS

13.1 The product supplier shall maintain an effective Quality Management system certified to ISO9001:2008 standards.

13.2 The Vendor shall submit his QA/ QC procedure for review and approval by the COMPANY.Control of non-conformity, corrective action and its long-term effects, if any, shall also bedetailed in the procedures.

13.3 All the major manufacturing events and inspection results shall be recorded.

13.4 It shall be the Vendors responsibility to ensure that all inspection; test and calibrationequipment is of the required accuracy, precision and repeatability. (Certified calibrationcertificate from local recognized and certified laboratories shall be furnished when requested/needed). A Certified copy of the Calibration procedure for each type of instrument shall befurnished for the COMPANYS review and approval.

13.5 All items shall be warranted against defective materials as required by the Project specificationsbut, in any case, for not less than 12 months in operation or 18 months from the date ofshipment. Defective parts found within the guarantee period shall be replaced/ repaired topermit the items to perform to design conditions.


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14 INSPECTION AND TESTING REQUIREMENTS

The Inspection and testing requirements shall be as per the ITP (Inspection and Testing Planwhich will be attached to the COMPANY requisition developed during Detailed ExecutionPhase.

14.1 The Contractor/ COMPANY shall review and approve all test certificates and test reports forFactory tests and checks carried out by the Vendor.

14.2 The Vendor shall submit all the test certificates/reports for Contractor/ Companys review andapproval, inclusive of following prior to equipment shipment.

14.2.1 Hydro-test & Leak test

Hydro-test as per ANSI B16.34 and Leak test shall be performed for Orifice fittings.

14.2.2 Material test certificates

Material Certificates, signed by the manufacturer, shall be provided (as a minimum) for all bodymaterials. Alternatively, Material Test Reports, in accordance with EN 10204, 3.1, shall befurnished for wetted and pressure containing parts and EN 10204, 2.2 Material Test Reports forother parts.

14.2.3 Welding

Welding shall be carried out only by qualified welders using qualified welding procedures(WPQR/ WQT). Welding procedures, performance of welders and welding operators shall meet

the requirements of ASME B31.3. Certificates for castings shall include weld repair dataincluding extent of repair, WPS, welder qualifications, post weld heat treatment and NDEfollowing the repair(s). Repair welding shall be performed using a properly qualified andapproved procedure. A repair procedure must include a method statement regarding theexcavation, NDT, and welding requirements. The repair of major defects shall not be performedwithout the knowledge of the COMPANY. Welding, NDE and heat treatment procedures requiresubmittal and approval by the Company prior to affecting the repairs.

14.2.4 NDT

NDT for fabricated flow elements prefabricated Meter runs shall be as per Project specificationP8383-TS-2000-P-0003 Piping Material Specification (PMS).

14.2.5 Dimensional verification

Verification of dimensions, angles and roughness factor etc. tolerance shall be as completed toconfirm compliance with the relevant standards and Project specifications and drawings

/documents.

14.2.6 Calibration

Calibration shall be performed in an accredited flow laboratory when specified in the associatedInstrument data sheet or when the meter is used for fiscal or custody transfer purposes.

The Elements used for fiscal or custody transfer purposes shall be certified by the Weights andMeasures authority of the originating country of manufacture.

15 MARKING AND TRACEABILITY REQUIREMENTS

15.1.1 Each element shall be permanently engraved/ stamped or bear a corrosion resistant SS 316Ltag plate riveted to the instrument body engraved with the details as specified. The letter height shallbe minimum of 2 mm and the location of the plate shall permit easy reading in the installedpositions.


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15.1.2 The following minimum information shall be clearly and deeply stamped or engraved on theFlow instruments:

15.1.2.1 On the Upstream side of Orifice Paddles/Handles: Upstream Tag number Orifice Bore diameter Plate Material Pipe size and Flange rating Beta ratio ( )

On the Downstream side of Orifice Paddle/Handle: Vendors serial number Type of Orifice (Square, Quarter etc.) in abbreviated form Differential pressure range (as specified in the associated Instrument data sheet).

15.1.2.2 Meter runs

Marking shall be as per the requirements in Project specification P8383-TS-2000-P-0003Piping Material Specification.

16 HANDLING, STORAGE, PRESERVATION AND PACKING REQUIREMENTS

All threaded and flanged openings shall be suitably protected to prevent ingress of foreignmatter. Packing and Preservation shall be suitable for the freight and subsequent short or long-term storage. Instruments requiring indoor or special storage shall have specific legendsoutside the packing to ensure proper compliance.

All items shall be duly marked with the tag number on the outside of the packing box. Sufficientquantity of desiccant material in pervious sachets to safeguard against ingress of moisture shallbe put into the packing box.

Packing for shipping shall be road worthy, air worthy and sea worthy (open deck stowage).

17 SPARE PARTS

Spare parts for consumables and Spare parts for two years shall be separately specified andquoted, where applicable as per companys SPIR format issued with project specification.

18 QUOTING INSTRUCTIONS (TECHNICAL)

All bids shall be submitted complete with the following technical details: Completed data sheet Sizing Calculation Catalogue details Model number decoding details Options listed separately with unit costs Impact on delivery for custom technical requirements List of exceptions & Non-compliance list (mandatory) Commissioning spares, commissioning consumables, special tools/lifting tackles/slings.

Consumables and 2-years operational spares (maintenance spares)


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19 VENDOR DESIGN DATA

Vendor shall be responsible for supplying the data as specified in the VDRS. The followingdocuments shall be supplied as a minimum for Companys record anduse. The data shall bepreferably on CD, properly indexed and readable like an e-Book. In such cases only one set ofhardcopy of documentation would be needed.

a) Filled in Datasheet as per the Company approved formats

b) OEM catalogues and O&M manual

c) Outline/ General Arrangement drawings with Bill of Material and Weight data.

d) Test Certificates

e) Installation, Operations and Maintenance Procedure/Manual

f) Consumables, Spares, Special tools/ Tackles for commissioning

g) 2 years operational spares list.

h) Sizing Calculations

i) Pressure test procedure

j) Painting Specification

k) Fabrication plan.

l) Quality Control and Quality Assurance Procedures and Plans.

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