Specification for Pipeline and Piping Valves

API SPECIFICATION 6D

TWENTY-FOURTH EDITION, AUGUST 2014

API MONOGRAM PROGRAM EFFECTIVE DATE: AUGUST 1, 2015 ERRATA 1, OCTOBER 2014

ERRATA 2, DECEMBER 2014

ERRATA 3, FEBRUARY 2015

ERRATA 4, JUNE 2015

ERRATA 5, JULY 2015

ERRATA 6, SEPTEMBER 2015

ERRATA 7, JUNE 2016

ERRATA 8, AUGUST 2016

ERRATA 9, MARCH 2017

ADDENDUM 1, MARCH 2015

ADDENDUM 2, JUNE 2016

Special Notes

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Copyright © 2014 American Petroleum Institute

Foreword

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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 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, NW, Washington, DC 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.

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

iii

Date of Issue: March 31, 2017

Affected Publication: API Specification 6D, Specification for Pipeline and Piping Valves, Twenty-fourth Edition, August 2014

ERRATA 9

(including changes from Errata 1, October 2014; Errata 2, December 2014;

Errata 3, February 2015; Errata 4, June 2015; Errata 5, July 2015;

Errata 6, September 2015; Errata 7, June 2016; and Errata 8, August 2016)

Page 2, Section 2, replace:

ASME B31.4, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids, 2013

with

ASME B31.4, Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids, 2012

Page 4, Section 2, insert the following normative reference:

SAE AMS 2750, Pyrometry

Page 18, Section 5.13, 4th paragraph, revise the 1st sentence to read:

Handwheel diameter(s) shall not exceed the 40 in. (1016 mm).

Page 24, Section 6.10, insert the following sentence at the end of the section:

Records of furnace calibration and surveys shall be maintained for a period not less than five years.

Page 30, Section 9.2, revise the 4th paragraph to read:

Any visually detectable leakage during the test duration at test pressure on any external surface of the shell is cause for rejection.

Page 33, Section 10, revise the 4th paragraph to read:

See Annex L for details on where coatings/paintings are not allowed.

Page 34, Table 7, revise lines 5 and 6 to read:

Page 35, Section 11, delete the text in the red box:

Page 51, Figure B.8, in the Key, revise 6) and 7) as follows:

1. clapper disc

2. seat ring

   
   

   Page 57, Figure B.14, replace part B of the figure as follows:

   
   

   Page 64, Table C.2, replace header row:

   
   

   Class 350

   
   

   with

   
   

   Class 300

   
   

   Page 81, Figure F.2, replace the labels on the figures to read:

   
   

   1. Side view b) Top view

Page 82, Section F.3.4, revise the paragraph to read:

Furnaces used for continuous heat treatment shall be calibrated in accordance with procedures specified in SAE AMS-2750.

Page 83, Section G.6, revise the acceptance criteria to read from:

Acceptance shall be in accordance with ASME BPVC, Section VIII, Division 1, Appendix 6.

to

Acceptance shall be in accordance with ASME BPVC, Section VIII, Division 1, Appendix 7.

Page 100, Figure K.6, replace the figure as follows:

Page 104, Section M.2, add the following row: 40 KSI or SMYS 276 MPa (Item 10: SMYS)

Page 104, Section M.2, revise the last row to read: (Item 15: serial number)

Page 104, Section M.4, delete the following row: 40 KSI or SMYS 276 MPa (Item 10: SMYS)

Page 110, delete the following bibliographical reference (moved to Section 2): [16] SAE AMS 2750, Pyrometry

Contents

Page

1. Scope 1

   1. General 1

   2. Conformance 1

   3. Conformance with Specification 1

   4. Processes Requiring Validation 1

2. Normative References 2

3. Terms, Definitions, Acronyms, Abbreviations, Symbols, and Units 4

   1. Terms and Definitions 4

   2. Acronyms and Abbreviations 9

   3. Symbols and Units 9

4. Valve Types and Configurations 10

   1. Valve Types 10

   2. Valve Configurations 10

5. Design 12

   1. Design Standards and Calculations 12

   2. Pressure and Temperature Rating 13

   3. Sizes 13

   4. Face-to-face and End-to-end Dimensions 14

   5. Valve Operation 14

   6. Pigging 14

   7. Valve Ends 15

   8. Valve Cavity Pressure Relief 16

   9. Drains 16

   10. Injection Points 17

   11. Drain, Vent, and Sealant Lines 17

   12. Drain, Vent, and Sealant Valves 18

   13. Handwheels and Wrenches—Levers 18

   14. Locking Provision 18

   15. Position of the Obturator 18

   16. Position Indicators 19

   17. Travel Stops 19

   18. Actuator, Operators, and Stem Extensions 19

   19. Lifting 19

   20. Drive Trains 20

   21. Stem Retention 20

   22. Fire Type-testing 20

   23. Antistatic Device 20

6. Materials 21

   1. Material Specification 21

   2. Tensile Test Requirements 21

   3. Service Compatibility 22

   4. Forged Parts 22

   5. Composition Limits 22

   6. Toughness Test Requirements 22

   7. Bolting 23

   8. Sour Service 23

      v

      Contents

      Page

   9. Drain Connections 23

   10. Heat-treating Equipment Qualification 24

7. Welding 24

   1. Welding Consumables 24

   2. Welding Procedure and Welder/Welding Operator Qualifications 24

   3. Impact Testing 25

   4. Hardness Testing 26

   5. Repair 26

   6. Repair of welds 26

8. Quality Control 27

   1. NDE Requirements 27

   2. Measuring and Test Equipment 27

   3. Qualification of Personnel 28

   4. NDE of Repairs 28

   5. Weld End NDE 29

   6. Visual Inspection of Castings 29

   7. Quality Specification Levels (QSLs) 29

9. Pressure Testing 29

   1. General 29

   2. Stem Backseat Test 30

   3. Hydrostatic Shell Test 30

   4. Hydrostatic Seat Test 31

   5. Check Valves 33

   6. Testing of Drain, Vent, and Sealant Injection Lines 32

   7. Draining 32

10. Coating/Painting 32

11. Marking 32

12. Preparation for Shipment 35

13. Documentation 36

    1. Minimum Documentation and Retention 36

    2. Documentation Provided with the Valve(s) 37

14. Facility Requirements 37

    1. Minimum Facility Requirements for the Assembler Category of Manufacturing 37

    2. Activities Applicable to an Assembler Facility 37

Annex A (informative) API Monogram Program Use of the API Monogram by Licensees 39

Annex B (informative) Valve Configurations 43

Annex C (normative) Valve End-to-end and Face-to-face Dimensions 58

Annex D (informative) Guidance for Travel Stops by Valve Type 78

Annex E (informative) API 20 Series Supply Chain Management 79

Annex F (normative) Qualification of Heat-treating Equipment 80

Annex G (normative) Requirements for Nondestructive Examination 83

vi

Contents

Page

Annex H (normative) Supplementary Test Requirements 87

Annex I (informative) Requirements for Extended Hydrostatic Shell Test Duration and Records Retention

for Valves in Jurisdictional Pipeline Systems 92

Annex J (normative) Quality Specification Level (QSL) for Pipeline Valves 94

Annex K (informative) Isolation Valve Features 99

Annex L (normative) External Coating for End Connections 102

Annex M (informative) Marking Example 104

Annex N (informative) Supplementary Documentation Requirements 105

Annex O (informative) Purchasing Guidelines 106

Bibliography 110

Figures

1. Typical Flange Dimensions 15

2. Bolt-hole Misalignment 16

3. Charpy V-notch Weld Metal Specimen Location 25

4. Charpy V-notch Heat-affected Zone Specimen Location 26

5. Typical Identification Plate for a Valve with One Seat Unidirectional and One Seat Bidirectional 36

1. Expanding-gate/Rising-stem Gate Valve 44

2. Slab-gate/Through-conduit Rising-stem Gate Valve 45

3. Plug Valve 46

4. Top-entry Trunnion Mounted Ball Valve 47

5. Three-piece Trunnion Mounted Ball Valve 48

6. Welded-body Trunnion Mounted Ball Valve 49

7. Reduced-opening Swing Check Valve 50

8. Full-opening Swing Check Valve 51

9. Single-plate Wafer-type Check Valve, Long Pattern 52

10. Typical Dual-plate Wafer-type Check Valve, Long Pattern 53

11. Single-plate Wafer-type Check Valve, Short Pattern 54

12. Axial Flow Check Valve 55

13. Piston Check Valve 56

14. Floating Ball Valve 57

1. Thermocouple Location—Rectangular Furnace (Working Zone) 80

2. Thermocouple Locations—Cylindrical Furnace (Working Zone) 81

1. Block and Bleed—Type A 99

2. Block and Bleed—Type B 99

3. Double Block and Bleed—Type A 100

4. Double Block and Bleed—Type B 100

5. Double Isolation and Bleed—Type A 100

6. Double Isolation and Bleed—Type B 100

1. Raised Face 102

2. Ring Type Joint or Raised Face Ring Type Joint 103

3. Weld End 103

4. Pipe Pup Weld Ends 103

vii

Contents

Tables

Page

1. Minimum Bore for Full-opening Valves 11

2. Thread/Pipe Sizes for Drains 17

3. Minimum V-notch Impact Requirements (Full-size Specimen) 23

4. Minimum Duration of Stem Backseat Tests 30

5. Minimum Duration of Hydrostatic Shell Tests 31

6. Minimum Duration of Seat Tests 31

7. Valve Marking 34

8. Minimum Facility Requirements 38

1. Gate Valves—Face-to-face (A) and End-to-end (B and C) Dimensions 59

2. Plug Valves—Face-to-face (A) and End-to-end (B and C) Dimensions 63

3. Ball Valves—Face-to-face (A) and End-to-end (B and C) Dimensions 69

4. Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions 74

5. Single- and Dual-plate, Long- and Short-pattern, Wafer-type Check Valves—Face-to-face

Dimensions 77

D.1 Valve Travel Stops 78

H.1 Minimum Duration of Gas Shell and Seat Tests 88

1. NDE Requirements 94

2. Extent, Method, and Acceptance Criteria of NDE/Item Examination Code 96

3. Additional Pressure Testing Requirements 97

4. Documentation Requirements 98

K.1 Isolation Valve Types 101

O.1 Valve Datasheet 108

viii

Introduction

This specification is the result of updating the requirements of API Specification 6D, 23rd Edition including Addendum 1, Addendum 2, and Addendum 3.

The revision of API 6D is developed based on input from API 6D Task Group technical experts. The technical revisions have been made in order to accommodate the needs of industry and to move this specification to a higher level of service to the petroleum and natural gas industry.

This specification 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.

ix

Specification for Pipeline and Piping Valves

1. Scope

   1. General

      
      

      This specification defines the requirements for the design, manufacturing, assembly, testing, and documentation of ball, check, gate, and plug valves for application in pipeline and piping systems for the petroleum and natural gas industries.

      
      

      This specification is not applicable to subsea pipeline valves, as they are covered by a separate specification, API 6DSS.

      
      

      This specification is not applicable to valves for pressure ratings exceeding Class 2500.

      
      

      If product is supplied bearing the API Monogram and manufactured at a facility licensed by API, the requirements of Annex A applies.

      
      

      Annexes B, C, D, E, F, G, H, I, J, K, L, M, N, and O are annexes that are used in order listed.

      
      

   2. Conformance

      
      

      1. Units of Measurement

         
         

         In this specification, data are expressed in both U.S. customary (USC) and metric (SI) units.

         
         

      2. Rounding

         
         

         Except as otherwise required by this specification, 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 ASTM E29 or ISO 80000-1, Annex B, Rule A.

         
         

   3. Conformance with Specification

      
      

      A quality management system shall be applied to assist conformance with the requirements of this specification. The manufacturer shall be responsible for conforming with all of the applicable requirements of this specification.

      
      

      It shall be permissible for the purchaser to make any investigation necessary in order to be assured of conformance by the manufacturer and to reject any material that does not conform.

      
      

   4. Processes Requiring Validation

The following operations performed during manufacturing shall be validated, by the manufacturer, in accordance with their quality system as applicable:

• nondestructive examination (NDE)—reference 8.1;

  
  

• welding—reference Section 7;

  
  

• heat treating—reference 6.1;

  
  

• external coating/component plating that may impact product performance, by agreement.

1