Senior Orifice

OFFSHORE DESIGN SECTION MUMBAI REGION

FUNCTIONAL SPECIFICATION FOR SENIOR ORIFICE ASSEMBLY

VOL No III REV No 1 FS No: 3205

FORMAT NO : WELL PLATFORM PROJECT

SHEET No. 1 OF 1

ODS/SOF/004


OIL AND NATURAL GAS CORPORATION LTD. INDIA

7 PREPARED BY

REVISED BY

ISSUED AS

APPROVED BY

TOTAL PAGE

1 DATE

REV No.





SHEET No. 2 OF 2

ODS/SOF/004

CONTENTS

Clause No.

ITEM

Page No.

1.0

Scope Of This Document

3

2.0

Standards And Specifications

3

2.1

Reference Specifications

3

2.2

Other Specifications to be followed

3

3.0

Scope Of Supply

3

4.0

Senior Orifice Assembly

4

4.1

Application

4

4.2

General

4

4.3

Material

4

4.4

Range

4

4.5

Scales

4

4.6

Flanges

5

4.7

Meter Runs

5

4.8

Orifice Plate Sizing

5

5.0

Equipment Protection

5

6.0

Installation Requirement

5

7.0

Calibration, Inspection And Testing

5

8.0

Documentation

5

9.0

Tagging & Nameplates

5

10.0

Review And Approval

6

11.0

Vendor Pre-Qualification Requirements

6

12.0

Preparation For Shipment

6

13.0

Receipt And Storage

6

Typical Data Sheet – Plates for Senior Orifice Assembly

7

Annexure I





SHEET No. 3 OF 3

ODS/SOF/004

1.0

SCOPE OF THIS DOCUMENT:

1.1

This specification describes the essential considerations in the selection, installation, calibration, testing and commissioning of Senior O rifice Assembly.

1.2

The Contractor shall be responsible for the design, engineering, procurement, packing, calibration, testing at yard and offshore, shipment to yard and offshore site, installation and commissioning at site of the Senior Orifice Ass embly.

2.0

STANDARDS & SPECIFICATIONS:

2.1

Reference Specifications:

2.2

a)

Specification No. 3.6: Instrumentation Design Criteria

b)

MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter

c)

Basic Bid Work

Other Specifications To Be Followed:

NIL

3.0

SCOPE OF SUPPLY:

3.1

The number of Senior Orifice Assembly to be supplied and installed shall be as per the process requirements indicated in the Basic Bid Work and the P & IDs.

3.2

The Senior Orifice assembly shall include Orifice Plates, sliding valve, equalizer, stuffing box, plate carrier, sealing unit, flanges, senior orifice fittings, studs, bolts, nuts, hand wrench, plugs and all the accessories to make the system complete. Chamber venting with vent valve shall be possible for senior orifice. Plug for senior orifice fittings along with N 2 purge connection shall be provided.

3.3

The scope of supply shall also include commissioning spares and two years’ spares as required by clause 3.6.4.8 of Instrumentation Design Criteria, and as suggested by the Manufacturer.





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ODS/SOF/004

4.0

SENIOR ORIFICE ASSEMBLLY:

4.1

Application:

4.1.1

Senior Orifice Fittings shall be used as the flow-measuring element wherever dictated by the process requirements.

4.1.2

In general, Senior Orifice Assembly with multiple orifice plates shall be used where a single orifice plate is required to continuously meter over a range greater than 3:1.

4.2

General:

4.2.1

Details of the Orifice Plates to be used in the Senior Orifice Assembly shall in general be as per Document No. MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.

4.2.2

The Senior Orifice Assembly shall be capable of withstanding differential pressure equal to full line pressure without zero or calibration change.

4.3

Material:

4.3.1

The material requirements for orifice plates to be used in the Senior Orifice Assembly shall in general be according to clause 4.3 of Document No. MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.

4.3.2

The material requirements for Senior Orifice Assemblies shall in general be according to clause 3.6.4.5 of Instrumentation Design Criteria.

4.4

Range:

4.4.1

Range selection for Orifice Plates used in the Senior Orifice Assembly shall in general be according to clause 4.4 of Document No. MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.

4.5

Scales:

4.5.1

Scales for Orifice Plates used in the Senior Orifice Assembly shall in general be according to clause 4.5 of Document No. MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.





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ODS/SOF/004

4.6

Flanges:

4.6.1

Senior Orifice flange shall be in general be flange neck.

4.7

Meter Runs:

4.7.1

Meter runs required for Senior Orifice Assembly shall in general be according to clause 4.7 of Document No. MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.

4.8

Orifice Plate Sizing:

4.8.1

Sizing for Orifice plate to be used in the Senior Orifice assembly shall be based on AGA Report No. 3. Orifice plate sizing calculations shall be submitted to Company for review.

5.0

EQUIPMENT PROTECTION:

5.1

Senior Orifice Assembly protection requirements shall in general be as per clause no. 3.6.4.4 of Instrumentation Design Criteria.

6.0

INSTALLATION REQUIREMENTS:

6.1

The installation of Senior Orifice Assembly shall in general be according to clause 3.6.4.6 of Instrumentation Design Criteria and as per clause 6.0 of Document No.: MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.

7.0

CALIBRATION, INSPECTION & TESTING:

7.1

Calibration, inspection and testing requirements shall in general be as per clause 3.6.4.7 of Instrumentation Design Criteria and as per clause 7.0 of Document No.: MR / OD / INST / FS / 3203: Functional Specification for Orifice Flow Meter.

8.0

DOCUMENTATION:

8.1

The documentation requirements shall in general be according to clause 3.6.6.2 of Instrumentation Design Criteria.

8.2

Sizing calculations for orifice plates used in the senior orifice assemblies shall be furnished along with the purchase specification.





SHEET No. 6 OF 6

ODS/SOF/004

8.3

Duly filled in data sheet shall be furnished along with the purchase specification. A typical blank data sheet is provided as Annexure – I of this document.

9.0

TAGGING & NAMEPLATES:

9.1

Tagging & Nameplate requirements shall in general be according to clause 3.6.6.1 of Instrumentation Design Criteria.

10.0

REVIEW & APPROVAL:

10.1

Review and approval of purchase specifications and other related documents shall in general be according to clause 3.6.6.3 of Instrumentation Design Criteria.

11.0

VENDOR PRE-QUALIFICATION REQUIREMENTS:

11.1

The Vendor pre-qualification requirements shall in general be according to clause 3.6.6.4 of Instrumentation Design Criteria.

12.0

PREPARATION FOR SHIPMENT:

12.1

The Senior Orifice Assemblies shall be prepared for shipment in accordance to clause 3.6.6.5 of Instrumentation Design Criteria.

13.0

RECEIPT & STORAGE:

13.1

Receipt and storage of the Senior Orifice Assemblies shall be in accordance to clause 3.6.6.6 of Instrumentation Design Criteria.


VOL No III


REV No 1 FS No: 3205


SHEET No. 7 OF 7

ODS/SOF/004 ANNEXURE – I - TYPICAL DATA SHEET FOR SENIOR ORIFICE ASSEMBLY SENIOR ORIFICE ASSEMBLY

UNITS: Flow

GENERAL

METER

PLATE

FLANGES

OPTIONS

SERVICE CONDITIONS

ITEM DETAILS

3

Liquid – M /HR. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

3

Gas – NM /HR.

2

Pressure – Kg/cm

o

Temperature – C

Tag Number Line Number Line Size & Schedule Service Inlet Line ID Outlet Line ID Diff Range In mm H2O Meter Maximum Type Sizing As Per Material Thickness “W” In Mm Beta Ratio d/D Bore Dia. ‘d’ Vent / Drain Center Distance ‘R’

Conn. Square Edged AGA 3 & API RP 3.2

Type Tap Type Size Number Of Taps Per Flange Material Size & Rating Facing & Finish Line ID / OD Gasket Thickness Mm Gasket Material Plate Holder Plate Holder Material Stud Bolt Material Nut Material Wetted Part Material

Flange Neck Flanged ½” NPT Two

Same As Plate

Straightening Vanes Connection Material Fluid State Flow Min. Maximum Flow Normal Inlet Pressure Operating Maximum Temperature Operating Maximum O Sp. Gr. At Oper. Temp. 15 C Molecular Weight Operating Viscosity (Cp) Compressibility Factor Pipe Reynolds Number IBR Certification Manufacturer Model Number

Cp / Cv

Level/Length - M

Senior Orifice

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