Specification for Pipeline Valves

ANSI/API SPECIFICATION 6D TWENTY-THIRD EDITION, APRIL 2008

EFFECTIVE DATE: OCTOBER 1, 2008

ERRATA 1, JUNE 2008

ERRATA 2, NOVEMBER 2008

ERRATA 3, FEBRUARY 2009

ADDENDUM 1, OCTOBER 2009

CONTAINS API MONOGRAM ANNEX AS PART OF

U.S. NATIONAL ADOPTION

ISO 14313:2007 (Identical), Petroleum and natural gas industries—Pipeline transportation systems—Pipeline valves

Special Notes

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Copyright © 2008 American Petroleum Institute

API Foreword

Nothing contained in any API publication is to be construed as granting any right, by implication or otherwise, for the manufacture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent.

This document was produced under API standardization procedures that ensure appropriate notification and participation in the developmental process and is designated as an API standard. Questions concerning the interpretation of the content of this publication or comments and questions concerning the procedures under which this publication was developed should be directed in writing to the Director of Standards, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.

Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annually and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005.

Suggested revisions are invited and should be submitted to the Standards and Publications Department, API, 1220 L Street, NW, Washington, DC 20005, standards@api.org.

Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform to the specification.

Should: As used in a standard, “should” denotes a recommendation or that which is advised but not required in order to conform to the specification.

This standard is under the jurisdiction of the API Standards Subcommittee on Valves and Wellhead Equipment (API SC6). This API standard is identical with the English version of ISO 14313:2007. ISO 14313 was prepared by Technical Committee ISO/TC 67 Materials, equipment and offshore structures for petroleum and natural gas industries, SC 2, Pipeline transportation systems.

For the purposes of this standard, the following editorial change has been made:

— A national informative annex (Annex F—API Monogram) has been included giving guidance to users.

This standard shall become effective on the date printed on the cover but may be used voluntarily from the date of distribution.

Contents

Page

API Foreword ii

Foreword v

Introduction vi

1. Scope 1

2. Conformance 1

   1. Units of measurement 1

   2. Rounding 1

   3. Compliance to standard 1

3. Normative references 2

4. Terms and definitions 4

5. Symbols and abbreviated terms 7

   1. Symbols 7

   2. Abbreviated terms 7

6. Valve types and configurations 8

   1. Valve types 8

   2. Valve configurations 9

7. Design 23

   1. Design standards and calculations 23

   2. Pressure and temperature rating 24

   3. Sizes 24

   4. Face-to-face and end-to-end dimensions 25

   5. Valve operation 39

   6. Pigging 40

   7. Valve ends 40

   8. Pressure relief 41

   9. Bypasses, drains and vents 42

   10. Injection points 42

   11. Drain, vent and sealant lines 42

   12. Drain, vent and sealant valves 43

   13. Hand-wheels and wrenches — Levers 43

   14. Locking devices 43

   15. Position of the obturator 43

   16. Position indicators 43

   17. Travel stops 44

   18. Actuator, operators and stem extensions 44

   19. Lifting 44

   20. Drive trains 44

   21. Stem retention 45

   22. Fire type-testing 45

   23. Anti-static device 45

   24. Design documents 45

   25. Design document review 45

8. Materials 46

   1. Material specification 46

   2. Service compatibility 46

   3. Forged parts 46

   4. Composition limits 46

   5. Toughness test requirements 47

   6. Bolting 48

   7. Sour service 48

   8. Vent and drain connections 48

9. Welding 48

   1. Qualifications 48

   2. Impact testing 48

   3. Hardness testing 49

   4. Repair 49

10. Quality control 51

    1. NDE requirements 51

    2. Measuring and test equipment 51

    3. Qualification of inspection and test personnel 51

    4. NDE of repairs 52

    5. Weld end NDE 52

    6. Visual inspection of castings 52

11. Pressure testing 52

    1. General 52

    2. Stem backseat test 53

    3. Hydrostatic shell test 53

    4. Hydrostatic seat test 54

    5. Testing of drain, vent and sealant injection lines 55

    6. Draining 55

12. Coating 55

13. Marking 56

14. Preparation for shipment 58

15. Documentation 58

Annex A (normative) Requirements for non-destructive examination 59

Annex B (normative) Supplementary test requirements 63

Annex C (informative) Supplementary documentation requirements 67

Annex D (informative) Purchasing guidelines 68

Annex E (informative) Marking example 75

Annex F (informative) API Monogram 77

Bibliography 79

ISO 14313:2007(E)

API Specification 6D / ISO 14313

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 14313 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 2, Pipeline transportation systems.

This second edition cancels and replaces the first edition (ISO 14313:1999), which has been technically revised, principally by the following.

• Clause 2, on the requirements for conformity to this International Standard, has been added for clarification.

  
  

• Clause 7, on the requirements for allowable stresses and allowable deflection on design, has been revised and clarified.

  
  

• Clause 8, on material, has been revised to align the requirements with global industry practice for carbon content and carbon equivalent for pressure-containing, pressure-controlling, welding ends and parts requiring welding.

  
  

• New requirements on repairs and NDE of welding repairs have been added to Clause 9 on Welding.

  
  

• A new table (Table D.2) has been added to Annex D (informative) to provide more guidance for those requirements listed in the text as requiring agreement between the manufacturer/purchaser.

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ISO 14313:2007(E)

API Specification 6D / ISO 14313

Introduction

This International Standard is the result of harmonizing the requirements of ISO 14313:1999 and API Spec 6D-2002[5].

The revision of ISO 14313 is developed based on input from both ISO/TC67/SC2 WG2 and API 6D TG technical experts. The technical revisions have been made In order to accommodate the needs of industry and to move this International Standard to a higher level of service to the petroleum and natural gas industry.

Users of this International Standard should be aware that further or differing requirements can be needed for individual applications. This International Standard is not intended to inhibit a manufacturer from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This may be particularly applicable where there is innovative or developing technology. Where an alternative is offered, the manufacturer should identify any variations from this International Standard and provide details.

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INTERNATIONAL STANDARD ISO 14313:2007(E)

API Specification 6D / ISO 14313

Petroleum and natural gas industries — Pipeline transportation systems — Pipeline valves

1. Scope

   
   

   This International Standard specifies requirements and provides recommendations for the design, manufacturing, testing and documentation of ball, check, gate and plug valves for application in pipeline systems meeting the requirements of ISO 13623 for the petroleum and natural gas industries.

   
   

   This International Standard is not applicable to subsea pipeline valves, as they are covered by a separate International Standard (ISO 14723).

   
   

   This International Standard is not applicable to valves for pressure ratings exceeding PN 420 (Class 2 500).

   
   

2. Conformance

   
   

   1. Units of measurement

      
      

      In this International Standard, data are expressed in both SI units and USC units. For a specific order item, unless otherwise stated, only one system of units shall be used, without combining data expressed in the other system.

      
      

      For data expressed in SI units, a comma is used as the decimal separator and a space is used as the thousands separator. For data expressed in USC units, a dot (on the line) is used as the decimal separator and a comma is used as the thousands separator.

      
      

   2. Rounding

      
      

      Except as otherwise required by this International Standard, to determine conformance with the specified requirements, observed or calculated values shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the limiting value, in accordance with the rounding method of ISO 31-0:1992, Annex B, Rule A.

      
      

   3. Compliance to standard

      
      

      A quality system should be applied to assist compliance with the requirements of this International Standard.

      
      

      NOTE ISO/TS 29001 gives sector-specific guidance on quality management systems.

      
      

      The manufacturer shall be responsible for complying with all of the applicable requirements of this International Standard. It shall be permissible for the purchaser to make any investigation necessary in order to be assured of compliance by the manufacturer and to reject any material that does not comply.

      
      

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      ISO 14313:2007(E)

      API Specification 6D / ISO 14313

      
      

3. Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments, corrigendum, and maintenance agency output) applies.

ISO 31-0,1992, Quantities and units — Part 0: General principles

ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method

ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances and designation

ISO 5208:1993, Industrial valves — Pressure testing of valves

ISO 7268, Pipe components — Definition of nominal pressure

ISO 9606-1, Approval testing of welders — Fusion welding — Part 1: Steels ISO 9712, Non-destructive testing — Qualification and certification of personnel ISO 10474, Steel and steel products — Inspection documents

ISO 10497, Testing of valves — Fire type-testing requirements

ISO 15156 (all parts), Petroleum and natural gas industries — Materials for use in H2S-containing environments in oil and gas production

ISO 15607, Specification and qualification of welding procedures for metallic materials — General rules

ISO 15609 (all parts), Specification and qualification of welding procedures for metallic materials — Welding procedure specification

ISO 15614-1, Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys

ISO 23277, Non-destructive testing of welds — Penetrant testing of welds — Acceptance levels

ISO 23278, Non-destructive testing of welds — Magnetic particle testing of welds — Acceptance levels

ASME B1.20.11), Pipe Threads, General Purpose, Inch

ASME B16.5-1996, Pipe Flanges and Flanged Fittings : NPS 1/2 through 24 ASME B16.10-2000, Face-to-Face and End-to-End Dimensions of Valves ASME B16.34-2004, Valves, Flanged, Threaded, and Welding End

ASME B16.47-2006, Large Diameter Steel Flanges : NPS 26 Through NPS 60 Metric/Inch Standard ASME B31.4-2006, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids ASME B31.8-2003, Gas Transmission and Distribution Piping Systems

ASME Boiler and Pressure Vessel Code, Section V: Nondestructive Examination

1. American Society of Mechanical Engineers International, 345 East 47th Street, NY 10017-2392, USA

   
   

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   ISO 14313:2007(E)

   API Specification 6D / ISO 14313

   
   

   ASME Boiler and Pressure Vessel Code — Section VIII: Rules for Construction of Pressure Vessels

   Division 1, Rules for Construction of Pressure Vessels

   
   

   ASME Boiler and Pressure Vessel Code — Section VIII: Rules for Construction of Pressure Vessels

   Division 2: Alternative Rules

   
   

   ASME Boiler and Pressure Vessel Code — Section IX: Welding and Brazing Qualifications

   
   

   ASNT SNT-TC-1A2), Recommended Practice No. SNT-TC-1A — Personnel Qualification and Certification in Non-Destructive Testing

   
   

   ASTM A3203), Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for Low- Temperature Service

   
   

   ASTM A370, Standard Test Methods and Definitions for Mechanical Testing of Steel Products

   
   

   ASTM A388, Standard Practice for Ultrasonic Examination of Heavy Steel Forgings

   
   

   ASTM A435, Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates ASTM A577, Standard Specification for Ultrasonic Angle-Beam Examination of Steel Plates AWS QC14), Standard for AWS Certification of Welding Inspectors

   EN 287-15), Qualification test of welders — Fusion welding — Part 1: Steels

   
   

   EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges

   
   

   EN 10204:2004, Metallic products — Type of inspection documents

   
   

   MSS SP-44, Steel Pipeline Flanges

   
   

   MSS SP-55, Quality Standard for Steel Castings for Valves, Flanges and Fittings and Other Piping Components — Visual Method for Evaluation of Surface Irregularities

   
   

   NACE TM0177-2005, Standard test method. Laboratory testing of metals for resistance to specific forms of environmental cracking in H2S environments

   
   

   NACE TM0284, Standard Test Method — Evaluation of Pipeline and Pressure Vessel Steels for Resistance to Hydrogen-Induced Cracking

   
   

   
   

2. American Society of Non-Destructive Testing, P.O. Box 28518, 1711 Arlingate Lane, Columbus, OH 43228-0518, USA.

3. ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, USA.

4. The American Welding Society, 550 NW LeJeune Road, Miami, FL 33126, USA.

5. CEN, European Committee for Standardization, Central Secretariat, Rue de Stassart 36, B-1050, Brussels, Belgium.

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