API Specification 6D

1 API Specification 6D Specification for Pipeline and Piping Valves TWENTY-FOURTH EDITION |AUGUST 2014 |108 PAGES|$ | PRODUCTNO. G6D024 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 6 DSS. This Specification is applicable to valves for the following pressure ratings only: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500, and Class 2500. For ordering information: Online: Phone: 1-800-854-7179 (Toll-free in the and Canada) (+1) 303-397-7056 (Local and International) Fax: (+1) 303-397-2740 API members receive a 30% discount where applicable.

2 ContentsPage1 Scope .. General .. Conformance .. Conformance with Specification .. Processes Requiring Validation.. 12 Normative References.. 23 Terms, Definitions, Acronyms, Abbreviations, Symbols, and Units.. Terms and Definitions .. Acronyms and Abbreviations .. Symbols and Units .. 94 Valve Types and Configurations .. Valve Types .. Valve Configurations.. 105 Design.. Design Standards and Calculations .. Pressure and Temperature Rating.. Sizes .. Face-to-face and End-to-end Dimensions .. Valve Operation .. Pigging .. Valve Ends .. Valve Cavity Pressure Relief .. Drains .. Injection Points .. Drain, Vent, and Sealant Lines .. Drain, Vent, and Sealant Valves .. Handwheels and Wrenches Levers.

3 Locking Provision .. Position of the Obturator .. Position Indicators .. Travel Stops .. Actuator, Operators, and Stem Extensions .. Lifting .. Drive Trains .. Stem Retention .. Fire Type-testing .. Antistatic Device .. 206 Materials.. Material Specification .. Tensile Test Requirements .. Service Compatibility .. Forged Parts.. Composition Limits .. Toughness Test Requirements .. Bolting.. Sour Service.. Drain Connections.. Heat-treating Equipment Qualification .. 237 Welding.. Welding Consumables .. Welding Procedure and Welder/Welding Operator Qualifications .. Impact Testing .. Hardness Testing.. Repair .. Repair of welds .. 268 Quality Control.. NDE Requirements.

4 Measuring and Test Equipment .. Qualification of Personnel .. NDE of Repairs.. Weld End NDE .. Visual Inspection of Castings .. Quality Specification Levels (QSLs) .. 289 Pressure Testing .. General .. Stem Backseat Test .. Hydrostatic Shell Test .. Hydrostatic Seat Test .. Check Valves .. Testing of Drain, Vent, and Sealant Injection Lines.. Draining .. 3210 Coating/Painting .. 3211 Marking.. 3212 Preparation for Shipment.. 3413 Documentation.. Minimum Documentation and Retention .. Documentation Provided with the Valve(s) .. 3614 Facility Requirements.. Minimum Facility Requirements for the Assembler Category of Manufacturing.. Activities Applicable to an Assembler Facility .. 36 Annex A (informative) API Monogram Program Use of the API Monogram by Licensees.

5 37 Annex B (informative) Valve Configurations .. 41 Annex C (normative) Valve End-to-end and Face-to-face Dimensions .. 56 Annex D (informative) Guidance for Travel Stops by Valve Type .. 76 Annex E (informative) API 20 Series Supply Chain Management .. 77 Annex F (normative) Qualification of Heat-treating Equipment .. 78 Annex G (normative) Requirements for Nondestructive Examination .. 81viContentsPageAnnex H (normative) Supplementary Test Requirements .. 85 Annex I (informative) Requirements for Extended Hydrostatic Shell Test Duration and Records Retention for Valves in Jurisdictional Pipeline Systems .. 90 Annex J (normative) Quality Specification Level (QSL) for Pipeline Valves.. 92 Annex K (informative) Isolation Valve Features .. 97 Annex L (normative) External Coating for End Connections.

6 100 Annex M (informative) Marking Example .. 102 Annex N (informative) Supplementary Documentation Requirements .. 103 Annex O (informative) Purchasing Guidelines .. 104 Bibliography .. 108 Figures1 Typical Flange Dimensions .. 152 Bolt-hole Misalignment .. 163 Charpy V-notch Weld Metal Specimen Location .. 254 Charpy V-notch Heat-affected Zone Specimen Location .. 255 Typical Identification Plate for a Valve with One Seat Unidirectional and One Seat Bidirectional .. Expanding-gate/Rising-stem Gate Valve .. Slab-gate/Through-conduit Rising-stem Gate Valve .. Plug Valve .. Top-entry Trunnion Mounted Ball Valve .. Three-piece Trunnion Mounted Ball Valve .. Welded-body Trunnion Mounted Ball Valve .. Reduced-opening Swing Check Valve .. Full-opening Swing Check Valve.

7 Single-plate Wafer-type Check Valve, Long Pattern .. Typical Dual-plate Wafer-type Check Valve, Long Pattern .. Single-plate Wafer-type Check Valve, Short Pattern .. Axial Flow Check Valve.. Piston Check Valve .. Floating Ball Valve .. Thermocouple Location Rectangular Furnace (Working Zone) .. Thermocouple Locations Cylindrical Furnace (Working Zone) .. Block and Bleed Type A .. Block and Bleed Type B .. Double Block and Bleed Type A .. Double Block and Bleed Type B .. Double Isolation and Bleed Type A.. Double Isolation and Bleed Type B.. Raised Face .. Ring Type Joint or Raised Face Ring Type Joint .. Weld End.. Pipe Pup Weld Ends .. 101viiContentsPageTables1 Minimum Bore for Full-opening Valves.. 112 Thread/Pipe Sizes for Drains.

8 173 Minimum V-notch Impact Requirements (Full-size Specimen) .. 224 Minimum Duration of Stem Backseat Tests .. 295 Minimum Duration of Hydrostatic Shell Tests .. 306 Minimum Duration of Seat Tests .. 307 Valve Marking.. 338 Minimum Facility Requirements .. Gate Valves Face-to-face (A) and End-to-end (B and C) Dimensions .. Plug Valves Face-to-face (A) and End-to-end (B and C) Dimensions .. Ball Valves Face-to-face (A) and End-to-end (B and C ) Dimensions.. Check Valves, Full-opening and Reduced Types Face-to-face (A) and End-to-end (B and C ) Dimensions .. Single- and Dual-plate, Long- and Short-pattern, Wafer-type Check Valves Face-to-face Dimensions .. Valve Travel Stops .. Minimum Duration of Pneumatic Shell and Seat Tests .. NDE Requirements.

9 Extent, Method, and Acceptance Criteria of NDE/Item Examination Code.. Additional Pressure Testing Requirements .. Documentation Requirements .. Isolation Valve Types .. Valve Datasheet .. 106viii