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The American Petroleum Institute (API) Implements API 6D 25th Standard
Standard Typical Requirements Comparison
API 6D-2021 25th and API 6D-2014 24th Standard Typical Requirements Comparison
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 1. Range | Applicable valve type: axial flow, ball, check, gate and plug valves applicable valve weight grade: ASME 150,300,600,900,1500 and 2500. | 1 Range 1.1 Overview | Applicable valve type: ball valve, check valve, gate valve and plug valve Applicable valve weights: ASME 150,300,400,600,900,1500, and 2500 | Axial flow valve was added and a pressure rating of 400 pounds was removed |
| 2. Normative references | 50 citation criteria | 2 Quote criteria | 46 Citation criteria | Eleven standards were removed, and 16 new standards were added |
| 3 Terms, definitions, acronyms, abbreviations, symbols, and units | 3 Terms, definitions, abbreviations, symbols, and units | |||
| 3.1 Terms and Definitions | 54 Terms and definitions. | 3.1 Terms and Definitions | 50 Terms and definitions | |
| 3.2 Acronym | 60 Acronyms. | 3.2 Symbols and abbreviations | 26 Acronyms. | |
| 3.3 Symbols and Units | Eight conformity and units are applicable to this document | 3.3 Symbols and Units | Four conformity and units are applicable to this document | Add 4 symbols and units |
| 4 Application, configuration, and performance | 4. Valve type and structure | |||
| 4.1 Valve type | This specification applies to: axial flow valves, ball valves, check valves, gate valves, and plug valves | 4.1 Valve type | Valve type: ball valve, check valve, gate valve, and plug valve | Axial flow valve was added |
| 4.2 Compliance and general performance requirements | Valves conforming to this specification shall be manufactured in accordance with the manufacturer's quality management system, such as API Q 1 or ISO 9001. | 1.3 Consistency with the specification | The quality management system shall be applicable to promote the consistency with the requirements of this specification. | The API Q 1 or ISO 9001 quality management system is clearly defined. |
| 4.3 Pressure and temperature rating | Pressure-temperature rating shall conform to the rating of applicable material groups in ASME B 16.34 or MSS SP-44. | 5.2 Pressure and temperature rating | Pressure temperature rating shall be specified in the applicable rating table of the corresponding material group in ASME B 16.34. | The MSS SP-44 standard was added. |
| 4.4 Valve orifice 4.4.1 nominal size 4.4.2 Full bore valves 4.4.3 Reduced bore valves with circular channels 4.4.4 Reduced bore valves with non- circular channels | 1. The minimum channel diameter of full- diameter valves is shown in Table 1. The valves manufactured in this specification shall be provided as nominal dimensions listed in Table 1. dimensions not listed in Table 1 shall be determined by agreement. 2. Reduced diameter valves with circular channels: NPS 4~NPS 12 diameter valves, one size smaller than the nominal diameter specified in Table 1, NPS 14~NPS 24 diameter diameter valves, one or two sizes smaller than the nominal diameter specified in Table 1. | 4.2 Valve structure 4.2.1 Full bore valves 4.2.2 Reduced bore valves | 1. The minimum channel diameter of the full- diameter valves is shown in Table 1. The valves manufactured in this specification shall be provided at the nominal size listed in Table 1.2. Reduced diameter valves with circular channels: NPS 4~NPS 12 diameter valves, one size smaller than the nominal diameter specified in Table 1, NPS 14~NPS 24 diameter diameter valves, and two sizes smaller than the nominal diameter specified in Table 1. | 1. Cancel the dimension circle and keep 1 decimal place. 2. The diameter of large size shrink valves with circular channels is changed from two smaller sizes to one or two smaller sizes. |
| 1. The allowed outsourcing processes include: product design and verification, material | 1. The allowed outsourcing processes include: product design and verification, material | 1. Change the | ||
| 4.5 Manufacturing Process 4.5.1 Process Control 4.5.2 Process that needs to be confirmed | procurement, machining, process inspection, welding, attachment I, additional requirements (J, K or L), coating / paint, corrosion prevention and transportation preparation; processes that cannot be outsourced: validation of products or activities provided by outsourcing, assembly, factory acceptance test (Section 10), marking / label / nameplates and final inspection.2. Special process requiring confirmation: heat treatment, welding, and non- destructive testing (Including appearance inspection). | 14 Factory Requirements 1.4 Procedures for requiring verification | procurement, machining, inter-process inspection, welding, supplementary NDE and testing (Appendix G, H, I and J), coating / paint; Process that cannot be outsourced: accept validation, assembly, validation test (Chapter 9), marking / label / nameplate, delivery preparation, and final inspection. 2. Special processes requiring verification: NDE- destructive testing, welding, heat treatment, external coating / assembly electroplating that may affect the product performance according to the agreement | anticorrosion and transportation preparation to outsourcing. 2. External coating /assembly plating was removed in the special process confirmation. |
| 5 Design | 5 Design | |||
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 5.1 General Provisions 5.1.1 Design Standards and Calculation 5.1.2 Pressure- bearing parts 5.1.3 Pressure control parts 5.1.4 Design of bolt joints | 1. The design and calculation of pressure parts and pressure boundary bolt connections shall comply with industry-approved design specifications or standards, such as ASME BPVC Volume 1 or 2; ASME B 16.34, EN 12516-1 or EN 12516-2, EN 13445-3. 2. Pressure control includes opening and valve seat. The manufacturer shall have documented process methods and acceptance criteria according to the design regulations. When designing the pressure balance hole, the ratio of the pore length to the pore diameter should be less than 10. | 5.1 Design standards and calculation methods | Pressure elements shall be designed and calculated in accordance with internationally accepted design codes or standards, such as ASME BPVC Volume 1 or 2; ASME B 16.34, EN 12516-1 or EN 12516-2, EN 13445-3, while considering pipe load, operating force, etc. | The scope and bolt joint design of pressure parts and control parts are defined |
| 5.2 Dimensions 5.2.1 Standard face-to-face and end-to-end dimensions 5.2.2 Non-standard face- to-face and end- to-end dimensions 5.2.3 end connections | 1. Standard face-to-face and end-to-end dimensions shall meet the applicable table in Appendix C. Not specified in Appendix C shall comply with ASME B 16.10. 2. Structural length and size tolerance: the tolerance of valve diameter less than NPS 12 is ± 1.5mm, and the tolerance greater than NPS 12 is ± 3.0mm 3. Coaxial degree of two flanges: the maximum flange deviation of valve diameter less than or equal to NPS 4 shall be 2mm, and the maximum flange deviation greater than NPS 4 shall be 3mm. 4. Parallel of two flanges: the maximum measurement difference between flanges with valve diameter less than NPS 24 is 1.75mm / m, and the maximum measurement difference between flanges greater than NPS 24 is 2.50mm / m. 5. Coaxial degree of the bolt hole: the deviation at the bolt hole with the valve diameter less than or equal to NPS 4 shall not exceed 2mm, and the deviation at the bolt hole greater than NPS 4 shall not exceed 3mm. 6. The welding end size shall meet the requirements of ASME B 31.4 or ASME B 31.8 or ASME B 16.25. | 5.4 (Face-surface and end-end) structure length 5.7 Valve end 5.7.1 Flange connection end 5.7.2 Welded connection end 5.7.3 Additional valve end connection | 1. The length of valve surface and end shall be according to Table C.1 To Table C. Provisions of 5, Table C.1 To Table C.5 Unspecified compliance with ASME B 16.10. 2. Structural length and dimension tolerance: the tolerance of valve diameter less than or equal to NPS 10 is ± 1.5mm, and the tolerance greater than or equal to NPS 12 is ± 3.0mm. 3. Flange centerline deviation-lateral adjustment: the maximum flange deviation of valve diameter less than NPS 4 shall be 2mm, and the maximum flange deviation greater than NPS 4 shall be 3mm. 4. Parallel of flange surface-Angle adjustment: the maximum measurement difference between flanges is 2.50mm / m. 5. Total allowable different axial degrees of the bolt hole: the deviation at the bolt hole with a valve diameter less than NPS 4 shall not exceed 2mm, and the deviation at the bolt hole greater than NPS 4 shall not exceed 3mm. 6. Welding end dimensions shall be in accordance with ASME B 31.3 or ASME B 31.4 or ASME B 31.8, in the case of thick wall valve body, the outer profile shown in ASME B 16.25 can be tilted at 30 degrees and then to 45 degrees. | 1. Structural length tolerance valve diameter limit changes (the tolerance of NPS 12 is adjusted from ± 3.0mm to ± 1.5mm). 2. Parallel of two flanges: the maximum measurement difference between flanges with valve diameter less than or equal to NPS 24 is 1.75mm / m. 3. Welding end size removes the ASME B 31.3 requirements. |
| 5.3 Drive chain 5.3.1 General information 5.3.2 Torque / thrust 5.3.3 Permissible Stress 5.3.4 Allow the offset | 1. The drive chain including the stem shall be designed under operating conditions due to the stem exceeding the maximum allowable torque / thrust, and this failure point shall occur outside the pressure boundary. The valve stem should be designed against misalignment. 2. For axial flow, floating ball, fixed ball, gate and plug valves, all design thrust or torque calculated by the drive chain shall be at least twice the detached thrust or torque. For a swing stop valve with an extension shaft for locking and open operation, all the design torque calculated by the drive chain shall be at least twice that of the open and closing member. For orbital ball valves, all design thrust or torque calculated by the drive chain shall be at least: | 5.20 Drive Chain 5.20.1 Design axial force or moment 5.20.2 Permissible stress 5.20.3 Allow the offset | For all drive chain calculations, the design axial force or torque shall be at least twice the detached axial force or torque. | Consider the stem failure requirements in the additional design. |
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 5.4 Operation 5.4.1 Operation method 5.4.2 Wrench and hand wheel 5.4.3 Position indicator 5.4.4 Travel Limit 5.4.5 Operating device | 1. The manufacturer may provide the valve operation data to the Buyer. 2. When the manual worm box is provided, the output torque / thrust rating shall be at least 1.5 times the maximum torque / thrust required by the valve. 3. When the maximum allowable working pressure, the maximum force required to apply the release torque or thrust at the hand wheel or wrench (rod) shall not exceed 360N. 4. The rotation of the closed valve shall be directed clockwise. 5. The length of the integrated trigger rod shall not exceed twice the length of the valve structure. Trilever exceeding 600mm in length shall be capable of removal. The diameter of the wheel shall not exceed 1000mm and the spoke shall not exceed the periphery of the wheel. 6. Valves with operators shall be equipped with indicators showing the opening and closing positions of the opening and closing parts. For ball and plug valves, the wrench and / or position indicator shall be consistent with the pipe when the valve opens. The wrench and / or position indicator shall be perpendicular to the pipe when the valve closes. The design shall be to ensure that the components of the indicator and / or wrench are not assembled to misindicate the valve position. 7. For valves that do not require a mechanical force to affect the seal, a travel limiter shall be provided on the valves and / or on the operator. 8. The lengthened valve stem and rod assembly shall be equipped with a protective cover. | 5.5 Valve Operation 5.13Hand Wheel and Wrench-Handle 5.14 Lock mechanism 5.15 Close Position 5.16Position Indicator 5.17 Travel Limit 5.18 Drive, operator, and stem lengthening | 1. The manufacturer shall provide the valve operation data to the Buyer, if required. 2. The wrench of the valve shall be of an integral design or composed of a head mounted to the valve stem, designed to use a lengthened handle. 3. The maximum force required to use the release torque or axial force on the hand wheel or wrench shall not exceed 360N. 4. The diameter of the hand wheel shall not exceed 1016mm, and the spoke shall not extend to the periphery of the hand wheel. 5. Close the direction is clockwise. 6. Valves with manual or power drives shall provide a visible position indicator to indicate the opening and closing position of the closing parts. For the ball valves and the rotary plug valves, the wrench and / or the position indicator shall be in a straight line with the pipe when the valve is open. The wrench and / or position indicator shall be placed across the pipe when the valve is closed. It shall be designed that the parts of the indicator and / or wrench shall not be assembled to falsely indicate the position of the valve. 7. Valves that do not require mechanical force for sealing shall provide travel limits on the valves and / or operating devices and shall be fixed in the open and closing positions. 8. The extended stem and shaft used underground are protected by an extended cover. | 1.Increase the worm box output torque / thrust requirements. 2.Clarify the length requirements of the plate and rod. 3.The diameter of the hand wheel is changed from no more than 1016mm to no more than 1000mm. 4.Delete the locking mechanism. |
| 5.5 Chamber pressure relief | When the valve is in the open / or closed position, the valve in the body cavity requires a pressure relief valve. For a temperature less than 121℃, the valve cavity relief pressure shall not exceed more than 33% of the rated pressure of the valve. For temperatures greater than 121℃, the manufacturer shall specify that the valve chamber discharge and high pressure housing design, and that the housing hydrostatic test shall meet the relevant requirements of 10.3. The external relief valve | 5.8 Pressure release of the valve chamber | Valves that are trapped in the body cavity when they are in the open / or closed position and shall provide an automatic cavity pressure release. Chamber pressure release shall not exceed 133% of the valve pressure rating at its maximum specified design temperature. The external relief valve shall be greater than 1/2". | The pressure rating base basis for designing the pressure relief valve is changed. |
| shall be greater than 1/2" | ||||
| 5.6 Valve body penetration parts 5.6.1 Discharge and pollutant discharge 5.6.2 Fat injection point | 1. All double seat valves providing upstream pressure source seal seats shall be provided with discharge or discharge joints. The discharge pipe size requirements are as follows: valve size is less than 2", pipe thread size is greater than 1/4", valve size is 2"~8", pipe thread size is greater than 1/2", valve size is greater than 8", pipe thread size is greater than 1". 2. When the fat injection point is provided, the valve seat fat injection point shall have two check valves, one of which the check valve shall be fixed in the valve, independent of the external fat injection assembly. The stem / shaft grease injection point shall be located above the main seal boundary line and shall include a fitting including the check valve and the pressure cap /plug. | 5.9 Emission 5.10 Injection point 5.11 discharge, exhaust and sealed grease conveying tubes 5.12 discharge, exhaust and sealing grease valves | 1. Drainage pipe size requirements are as follows: valve size 1/2"~11/2", pipe thread size is equal to greater than 1/4", valve size 2" ~8", pipe thread size is equal to greater than 1/2", valve size is greater than 8", pipe thread size is equal to greater than 1". 2. The valve seat and / or valve stem shall be provided with sealing grease, lubricant or flushing injection points, and each injection point shall be equipped with a check valve and isolation aid. | The provision of lipid injection valve is changed from the original proposal to the manufacturer's own design requirements or the buyer's requirements. |
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 5.7 Stem holding | The valve shall be designed to ensure that the stem is maintained by pressure components so that the stem does not emit due to internal pressure. | 5.21 Valve stem holding | Valves shall be designed to stem under any internal pressure conditions or with packing cover parts and / or valve operating device mounting removed. | |
| 5.8 Anti-static | Resistance between the 12V valve opening and the valve body, and between the stem and shaft and the valve body, shall not exceed 10 ohms. | 5.23 Anti-static static device | Soft sealing ball valve, plug valve and gate valve should have anti-static device. The resistance between the closure piece and the body and between the stem / shaft and the body shall be measured using a DC power supply of not more than 12V. Resistance measurement shall be performed on a dry valve before the pressure test and the resistance shall not exceed 10 ohms. | |
| 5.9 Lifting | The manufacturer shall draw lifting drawings and operation instructions for valves weighing greater than 25KG to ensure safe lifting operation. The safety working load limit and valve center of gravity position for each lifting point shall be specified in the lifting drawing and operation instructions. | 5.19 Hanging ear | The manufacturer shall determine the necessity for the use of the hanging ears and verify the suitability of their position. If the lifting ear position of the valve is not required, the Buyer shall state it. If the valve manufacturer is responsible for providing the valve and operating device assembly, the valve manufacturer shall verify the suitability of the finished valve and operating device assembly boom ear position. | Add the requirements for lifting drawings and operation instructions. |
| 5.10 Design Process 5.10.1 Overview 5.10.2 Design Document 5.10.3 Design review and verification 5.10.4 Design confirmation | The manufacturer shall establish a documented design review, acceptance, and confirmation procedures. The design document shall include methods, assumptions, calculations and analytical requirements. The design document shall remain for 10 years after the last valve is manufactured. | New design program requirements. | ||
| 5.6 Cleaning management | The Buyer shall specify the valve clearance requirements. | delete | ||
| 5.22 Fire nresistance test | Design fire resistance test proof shall be provided. If required, in accordance with the O. Section 5. Fire resistance test was conducted. | delete | ||
| 6 Materials | 6 Materials | |||
| 1. Documented material specifications shall be established with the following contents: material grade, chemical analysis, heat | 1. Specification for metal pressure parts and | |||
| 6.1 Metal requirements 6.1.1 General Description 6.1.2 Castings 6.1.3 Forgings | treatment, tensile test, carbon equivalent (CE) of carbon steel welding end materials and carbon content of stainless steel welding end materials, summer specific impact of low temperature materials, hardness of acid conditions, material certificate.2. Evaluation and production guidelines for casting and forging materials are provided in API 20A, API 20B and API 20C. Metal Material Outsourcing Supplier's Use Guide, API 20J.3. All forging materials shall be formed by heat processing process and heat treatment process. The minimum forging pressure ratio of all forging pressure- bearing materials shall be 3:1, and the forging pressure ratio shall be reflected in the material certificate. | 6.1 Material Specification 6.4 Forging parts | pressure control parts shall be established, stipulating the following contents: material label, chemical composition, heat treatment, mechanical properties (stretching), material certificate, carbon equivalent (CE) of materials, sharp ratio impact, hardness and test. 2. All forging materials shall be heat- processed method and heat treatment to make the whole material form a forging structure. | Increase the requirements of forging ratio and forging ratio of material certificate system. |
API 6D-2021 and API 6D-2015 Standard Typical Requirements Comparison
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 6.2 Non-metallic requirements | 1. Material specifications for non-metallic seals shall be established, and the following contents shall be specified: general basic polymer materials, general thermoplastics, physical properties requirements (mechanical properties), and storage and control requirements. 2. See API 20L for the polymer seal manufacturer qualification guide, and for additional requirements for seal identification test, see L.6 . 3. The elastic material used for gas valves under pressure above 600 pounds shall be resistant to instantaneous gas loss. 4. The manufacturer's documented requirements for non-metallic seals shall be provided with at least the following provisions: batch number / traceability, curing / molding date, and shelf life. | 6.3 Compatibility used | 1. All process wet parts (metallic and non- metallic) and grease shall be suitable for the use medium and working conditions specified by the Buyer. Selected metal materials shall be protected from corrosion and wear. 2. Elastic material for gas valves at pressure above 600 lb should consider the impact of sudden step- down. | New requirements for establishing material specification and documentation for non-metallic seals. |
| 6.3 Composition limitation | 1. The chemical composition of carbon steel welding end shall meet the following requirements: carbon content not exceeding 0.23%, sulfur content not exceeding 0.020%, phosphorus content not exceeding 0.025%, and carbon equivalent (CE) not exceeding 0.43%. 2. The carbon content of austenitic stainless steel welding end does not exceed 0.03%, stabilize the element material, and the carbon content can reach 0.08%. | 6.5 Composition limitation | 1. The chemical composition of carbon steel welding end shall meet the following requirements: carbon content not exceeding 0.23%, sulfur content not exceeding 0.020%, phosphorus content not exceeding 0.025%, and carbon equivalent (CE) not exceeding 0.43%. 2. The carbon content of austenitic stainless steel welding end does not exceed 0.03%, stabilize the element material, and the carbon content can reach 0.08%. | |
| 6.4 Tensile test requirements | The load bearing and controls shall be tested at room temperature at least once in accordance with ASTM A 370, ASTM E 8 or ISO 6892-1. | 6.2 Tensile test requirements | The tensile test at room temperature shall be performed in accordance with the procedures specified in ASTM A 370 or ISO 6892-1. | Added to the ASTM E 8 requirements. |
| 6.5 Impact test | 1. Impact test shall be conducted for carbon steel, alloy and stainless steel (other than- austenitic grade) valves with a working temperature below-29℃. Type V test block was used, in accordance with ASTM A 370 or ISO 148-1. 2. If a small size sample is used, at the full size sample test temperature, the 100 V notch impact requirement equals the 1010 sample multiplied by the adjustment coefficient listed in Table 6. | 6.6 Resilience test requirements | Impact test shall be conducted for carbon steel, alloy and stainless steel (other than- 29℃. Type V test block was used, in accordance with ASTM A 370 or ISO 148-1. | Increase the allowable adjustment and adjustment coefficient of small size impact. |
| 6.6 Acid working | Suitable metal materials in acidic environment shall meet NACE MR 0175 / ISO | 6.8 Sulphur-bearing | Pressure and pressure control parts and bolt connection materials used for sulfur-bearing | Removed the NACE MR |
| condition | 15156 requirements. | working condition | conditions shall meet the requirements of NACE MR 0175 / ISO 15156 / NACE MR 0103. | 0103 request |
| 6.7 Valve body penetration parts | Materials for discharge, discharge and lipid injection elements or other components shall match the valve body material or be made of corrosion resistant material. | 6.9 Emission connection | Threaded plugs shall be consistent with the body material or made of corrosion resistant material. | |
| 6.8 Heat Treatment Equipment 6.8.1Overview 6.8.2Instrument accuracy 6.8.3Instrument Calibration 6.8.4 Production equipment intermittent furnace | 1.The heat treatment furnace shall be measured for the furnace temperature uniformity within 1 year according to the service cycle.For furnace for austenitic, normalizing, annealing or solution annealing, the variation of measured and set temperature shall not exceed ± 14℃. Stoves for tempering, aging or stress removal, measured and set temperature shall not exceed ± 8℃. Heat treatment equipment is calibrated and measured according to SAE AMS 2750F and Table7. 2. Control and recording instrument for the heat treatment process shall be accurate to ± 1% of its full range. 3. Temperature control and recording instruments shall be calibrated at least once every 3 months. | 6.10 Heat Treatment equipment identification 8.2.5 Verification of heat treatment equipment | 1. The heat treatment furnace shall be measured for the furnace temperature uniformity within 1 year according to the service cycle. The temperature change at any point in the work zone shall not be greater than ± 13℃. Stoves for tempering, aging or stress removal, measured and set temperature shall not exceed ± 8℃. 2. Control and recording instrument for the heat treatment process shall be accurate to ± 1% of its full scale.3. Temperature control and recording instruments shall be calibrated at least once every 3 months. | 1.For furnace for austenitic and normalizing, the temperature deviation is changed from ± 13℃ to ± 14℃. 2.The error requirements of each level of heat uniformity measurement of heat treatment are added. |
API 6D-2021 and API 6D-2015 Standard Typical Requirements Comparison
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 7 Welding | 7 Welding | |||
| 7.1 General Provisions | Supersonic spraying is not a welding process and is not required to meet Part 7 of this specification | newly increased | ||
| 7 2 Welding outsourcing | See API 20G for the welding outsourcing service guide | newly increased | ||
| 7.3 Welding material | Documentation procedures for the storage and control of welding materials shall be established. | 7.1 Welding materials | Welding materials shall meet the American Welding Institute or the manufacturer's specifications. The manufacturer shall have written procedures for the storage and control of the welding materials. | |
| 7.4 Evaluation | 1. Process evaluation of pressure bearings and controls (including supplementary welding) is conducted in accordance with ASME BPVC Volume 1 or the applicable part of ISO 15609 and ISO 15614. 2. Welders and welding operators shall meet the requirements of ASME BPVC Volume 1 or ISO 9606-1 or ISO 14732. | 7.2 Welding process and welder / welding operator qualification evaluation | 1. Welding of pressure and pressure control parts, including welding, shall be performed in accordance with the procedures confirmed by ASME BPVC and sections 7.2 and 7.3 of this Specification or ISO 15607, ISO 15609 and ISO 15614-1. 2. Welders and welding operations shall be assessed as per ASME BPVC, Volume 1 or ISO 9606-1, EN 287-1 | 1. Welding process assessment removes the requirements of ISO 15607. 2. Welder assessment changes EN 287-1 requirement to ISO 14732 requirement. |
| 7.5 Repair weld layer 7.5.1 Overview 7.5.2 Hard surface repair weld layer 7.5.3 corrosion resistant alloy repair weld layer | 1. Evaluation of stacking layer shall meet the requirements of ASME BPVC, Volume, or ISO 15614-7. When the valve is specified for acidic environment, the hardness measurement requirements shall comply with NACE MR 0175 / ISO 15156 requirements. 2. The weld layer of hard surface stacking shall be detailed in the thickness and other limitations in the Welding Process Assessment (WPS and PQR). 3. For the corrosion-resistant alloy stacking layer of nickel-based alloy UNS N 06625, the weld metal chemical analysis on the final assessed minimum cover thickness determined in the welding process assessment shall be the iron dilution grade Fe 10,that is,the maximum iron mass fraction shall not exceed 10%. 4 . The stacking layer shall be Inspected according to Chapter 9 of ASME BPVC Volume V. The liquid penetration test and acceptance criteria, performed in accordance with ASME BPVC Volume V, Chapter 6, shall comply with ASME BPVC Volume 1, Appendix 8. | 1. Identification of surfacing shall be in accordance with ASME BPVC Volume, and sections or ISO 15614-7.2. Chemical composition analysis of weld metals shall be performed in accordance with the requirements of ASME BPVC, Volume, for the minimum weld thickness of finished components. To ensure a minimum thickness of 3.0mm, the main weld requires two passes to achieve the desired dilution. 3. For surfacing or clad welding of nickel- based alloy UNS N 06625, the chemical composition of surfacing or clad welding thickness shall meet one of the following grades: ① Fe 10 iron 10.0%, and ② Fe 5 iron 5.0%. | 1. The description of the minimum thickness of 3.0mm was removed. 2. Nickel- based alloy stacking welding, iron dilution grade changed to Fe 10. 3. The appearance of surfacing layer and nondestructive testing requirements are clarified. | |
| 7.6 Impact test | Carbon steel, alloy steel, and stainless steel (except austenitic steel) materials used for valves shall be impact tested at allowable temperatures below-29℃. | 7.3 Impact test | Impact tests for welding process evaluation shall be performed on valves with design temperatures below-29℃. | |
| 7.7 Hardness test | The hardness measurement shall be made on the base material, weld metal and heat impact area according to the requirements of NACE MR 0175 and ISO 15156. | 7.4 Hardness test | Hardness measurement shall be measured on body metal, welded metal and heat impact zone as per NACE MR 0175, ISO 15156 or NACE MR 0103. | Removed the NACE MR 0103 request |
| 7.8 Visual inspection-Welds between pressure parts | The welds of pressure parts shall be inspected in accordance with ASME BPVC Volume V, Chapter 9. | newly increased | ||
| 7.9 Visual inspection- Pressure parts and sleeve welds | Pressure parts welds and sleeve to valve welds shall be visually inspected in accordance with ASME BPVC Volume V, Chapter 9. | newly increased |
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 7.10 NDT-Welds for pipe sleeves and valves | 1. The weld groove of the welding end of the pressure pipe sleeves and valves shall be subjected to surface nondestructive testing using magnetic powder testing or liquid penetration testing. The test standard is the relevant chapter of ASME BPVC Volume V, the acceptance standard is ASME BPVC, and the relevant chapter of Volume V.2. The welds of pressure pipe sleeves and valves shall be tested for internal nondestructive testing using radiation testing or ultrasonic waves. The test criteria are the relevant sections of ASME BPVC Volume V and the acceptance criteria of ASME BPVC Volume V. | newly increased | ||
| 7.11 Manufacturing and Repair 7.11.1 At the Material Supplier-Casting welding repair 7.11.2 Manufacturer- Casting welding repair 7.11.3 Forgings and sheet welding repair 7.11.4 Welds | 1. The manufacturer's material specification shall specify that the welding repair process and personnel shall meet the requirements of the welding process assessment and welder skill assessment of ASTM A 488, ASME BPVC, Volume 1 or ISO 15607, ISO 15609, ISO 15614-1 and ISO 15614-7 or equivalent. 2. The manufacturer shall establish documented supplementary welding procedures to specify the requirements for defect removal, welding, heat treatment, non- destructive testing and reporting. 3. surface nondestructive testing shall be conducted by magnetic particle detection or liquid penetration test after defect removal and welding. The test criteria are the relevant sections of ASME BPVC Volume V and the acceptance criteria of ASME BPVC Volume V. 4. When the post-welding heat treatment temperature is lower than the final tempering temperature of the raw materials of 28℃, or when the post-welding heat treatment is a solid solution annealing, the mechanical performance test shall be carried out again according to the original material specifications. 5. Welding and repair of forgings and plates should not be used to correct material defects, and can be used to correct processing errors. | 7.5 Repair 7.6 Repair welding 8.4 Nondestructive inspection of welding repair (NDE) | 1. Defects shall be repaired in accordance with the documented procedures required for defect removal, welding, heat treatment, nondestructive testing, and reporting (when applicable). 2. Forgings and plates shall not be repaired with material defects, unless otherwise agreed. However, repair welding can be used to correct processing defects. 3. Repair welding shall be conducted in accordance with the applicable design specifications or standards listed in 5.1, including any post- weld heat treatment. 4. After defect removal and supplementary welding, the excavated parts shall be inspected according to the magnetic powder or liquid penetration method used in Appendix G. Acceptance criteria shall be specified in Appendix G of the corresponding product table. | 1. New requirements for welding and repair personnel of material suppliers. 2. New mechanical performance test requirements after post-welding heat treatment under specific conditions. 3. The NDT acceptance standard after defect removal and replacement welding is changed to ASME BPVC Vol. |
| 8 Bolt | 6.7 Bolted connection | Carbon-steel and low-alloy-steel bolted materials with more than HRC 35 hardness for valves where hydrogen brittle may occur shall not be used. | Identify the standard requirements of all kinds of bolts. | |
| 8.1 Pressure boundary bolt connection | Pressure boundary bolts shall be conform to API 20E, BSL-1 for alloy and carbon steel bolts or API 20F, BSL-2 with corrosion resistant bolts. Carbon steel and alloy steel bolts meet ASTM A 320 / A 320M. | |||
| 8 2 Other bolting | Other bolt connections shall comply with the industry specifications. | |||
| 9 Quality control | 8 Quality control | |||
| 9.1 Measurement and test equipment | Measurement equipment shall be identified, controlled, calibrated and adjusted at specified intervals according to documented procedures. | 8.2 Measurement and Test equipment 8.2.1General Rules 8.2.2 Size measuring instruments | 1. Equipment for testing, testing, or inspection materials or other equipment for acceptance shall be identified, controlled, calibration and calibrated within the specified period in accordance with the manufacturer's instructions. 2. Size measurement instruments shall be controlled and calibrated by the methods specified in the written procedures. | |
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 9.2 Pressure measuring device | The accuracy of the pressure gauge should be at least 2% of ± of full range, effective range of 20%~80% of full range, calibration interval should not exceed 90 days, should be calibrated at at least 3 isometric points in the full range, 0 points and 100% points are not necessary verification points. | 8.2.3 Pressure measuring instrument | The accuracy of the pressure gauge shall be at least 2% ± of the full range, and 20%~80% of the full range. The calibration interval shall not exceed 90 days, and it shall be calibrated at at least 3 isometric points of the full scale (except 0 points and 100%). | Pressure gauge 0 point 100% can not be verified. |
| 9.3 Welding inspectors | Personnel visually inspecting welding operations and completed welds shall assess and record according to the manufacturer's documented procedures (establish documented identification procedures for welding operations and inspection personnel training) | 8.3.4 Welding inspectors | Visual inspectors for welding operations and completed welding shall be assessed and confirmed in accordance with the AWS QC 1 or manufacturer written training program. | |
| 9.4 Appearance Inspection 9.4.1Appearance inspector 9.4.2Appearance inspection of castings 9.4.3Appearance inspection of forgings 9.4.4Appearance inspection of final machining parts | 1. Visual inspectors shall perform and pass the annual visual examinations in accordance with the manufacturer's documented procedures and to comply with ASNT SNT-TC-1A or ISO 9712. 2. The appearance of the casting shall comply with MSS SP-55 and the manufacturer. 3. The appearance of the forgings shall meet the requirements of ASME BPVC Ⅷ Volume 1-UF- 45 and UF-46 for the absence of visible defects, including cracks, interlayer and folds.4. Machined surfaces, seals, washers, seat springs, and parts with plating shall be inspected in accordance with the manufacturer's documented procedures or industry specifications. | 8.3 Qualification of Inspection and Testing Personnel 8.3.1 Non- destructive Inspectors 8.3.2 Visual Inspectors 8.3.3 Other personnel 8.6 Visual inspection of castings | 1. The NDE inspectors shall be assessed by the manufacturer's written training program as required by either ASNT SNT-TC-1A or ISO 9712. 2. Visual inspectors shall conduct and pass a visual examination within 1 year in accordance with the manufacturer's written procedures that meet the applicable requirements of ASNT SNT-TC-1A or ISO 9712. 3. All personnel performing other quality control activities that directly affect the quality of materials and products shall be assessed in accordance with the written requirements of the manufacturer. 4. All castings shall be visually inspected in accordance with the acceptance criteria of MSS SP-55. | 1. Delete the training and assessment description of NDE inspectors and other personnel directly affecting product quality. The requirements of the NDE inspectors are reflected in Appendix I. 2. Appearance inspection and document requirements for forgings and machining surfaces and other parts and components |
| 8.1 Nondestructive testing requirements (NDE) | When specified by the Buyer, the NDT requirements shall be in accordance with Appendix G. | Delete this statement | ||
| 8.2.4 Temperature measuring instrument | Temperature measuring instruments shall be capable of displaying or recording temperature fluctuations of 5℃ | Delete this statement | ||
| 8.5 Nondestructive Inspection (NDE) | If the Purchaser specifies that the welding end is subject to volume or surface NDT, the inspection and acceptance criteria shall be as per G.24，G.26 or G.27. | Delete this statement | ||
| 8.7 Quality specification grade (QS Ls ) | If specified by the Buyer, Appendix J describes the quality specification grades (QSLs), including detailed requirements for nondestructive testing (NDE), Y pressure testing, and manufacturing process writing | Delete this statement | ||
| 9.5 Storage of nonmetallic seals | Storage requirements for establishing non- metallic seals shall include at least: aging control, indoor storage, maximum temperature exceeding 49℃, avoid direct and natural, light exposure, stress free storage, avoid contact with liquid, prevent ozone and ray damage, packaging and storage shall not apply tensile or compressive stress sufficient to cause permanent deformation or other damage. | newly increased | ||
| 9.6 Valve assembly | The manufacturer shall develop documented assembly procedures that shall include the bolt pretightening requirements for pressure boundary bonding. Use-sealed valves with interfaces between pressure controls. | newly increased |
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 10 Factory acceptance test | 9 Pressure test | |||
| 10.1 Stress Testing-Overview | 1. Documented stress testing procedures should be developed.2. No protective coating, such as paint, shall be applied on any surface before inspection or pressure testing. Non-sealant sealing valve, test valve seat and sealing surface should be free of sealant. 3. Pressure test sequence: seal on the valve stem, hydrostatic housing, hydrostatic valve seat. 4. Pressure test water shall contain corrosion inhibitor, and the chloride ion content in pressure test water for austenitic and duplex stainless steel valves is less than 30ppm, and at least every 12 months. | 9.1 General rules | 1. Pressure test shall be conducted before painting the valve surface. The valve seat and sealing surface shall be free of sealing grease during the test. 2. Pressure test sequence: seal on the valve stem, hydrostatic housing, hydrostatic valve seat. 3. Pressure test water should be fresh water and contain preservatives. Chloride content in the water used for wetting parts of austenitic and duplex stainless steel valves is less than 30ppm and is detected at least every 12 months. | |
| 10.2 Seal test on the valve stem | The packing lid shall be loosened and the packing or seal shall be removed. Before the upper seal test, it should be partially opened, and then close the upper seal after the medium flows out. | 9.2 Seal test on the valve stem | The packing lid shall be loosened and the packing or seal shall be removed. Before the upper seal test, it should be partially opened, and then close the upper seal after the medium flows out. | |
| 10.3 Hydrostatic housing test | 1. During the hydrostatic shell test, remove the external pressure relief valve and plug its connection point. For valves with sleeves, test the main housing first before welding the sleeves. 2. If provided as part of the final assembly, discharge, discharge and lipid injection lines shall be hydrotested with valves. | 9.3 Hydraulic housing test 9.6 Discharge, exhaust and sealed fat injection lines test | 1. During the hydrostatic shell test, remove the external pressure relief valve and plug its connection point. For valves with sleeves, test the main housing first before welding the sleeves. For the valve that removes the external pressure relief valve, install the external pressure relief valve before performing the overall shell test. The connection of the external relief valve to the valve body shall be tested at 95% of the relief valve design pressure. 2. If provided, as the final assembly part, the discharge, exhaust pipes and sealed grease injection tubes shall be hydrodynamically tested together with the valve in Section 9.3. | |
| 10.4 Hydrostatic | 1. For soft seat valve and oil seal plug valve, the leakage shall not exceed class ISO 5208 A. 2. For metal seat valves (except check valves), the leakage shall not exceed class ISO 5208 C. | 9.4 Hydraulic seal test | 1. For soft valve seat valves and oil seal plug valves, the liquid leakage rate shall not exceed grade ISO 5208 A. 2. For metal seat valves, except for check valves, the liquid leakage rate shall not exceed Class ISO 5208 D. | Metal seat valves (except check valves), leakage level from ISO |
| valve seat test | 3. For metal valve seat stop valves, the leakage shall not exceed level ISO 5208 G. 4. After completing the hydrostatic valve seat test, the parts such as the drain valve, grease injection valve and pressure relief valve shall be installed according to the documented procedures. 5. The hydrostatic valve seat test pressure of the check valve shall be applied from the downstream direction of the fluid block. | 9.5 Check valve | 3. For metal valve seat stop valves, the leakage shall not exceed level ISO 5208 G. 4. After the sealing test, the parts, such as emptying or discharging plugs and cavity pressure relief valves, shall be assembled according to the written procedures. 5. The sealing test pressure of the check valve shall be applied in the direction of the required flow block. | 5208 D to ISO 5208 C. |
| 10.5 Hydrostatic test-Valve chamber pressure relief valve | The set pressure of the pressure relief valve shall be between 1.1 and 1.33 times the pressure rating at the material time of 121℃. The return seat pressure shall not be less than 1.05 times the rated pressure of the valve. The set pressure for the relief valve with a temperature above 121℃ shall be specified. | 9.4.4.4 Test of the cavity pressure relief valve | The set pressure of the pressure relief valve shall be between 1.1 and 1.33 times the pressure rating at the material time of 38℃. The return seat pressure shall not be less than 1.05 times the rated pressure of the valve. | The pressure rating is changed from at material 38℃ to at material 121℃. |
| API 6D-2021 25th Standard Typical Requirements | API 6D-2014 24th Standard Typical Requirements | 2021 | ||
| clause | primary coverage | clause | primary coverage | |
| 11 Coating / paint | All non-corrosion resistant valves shall be externally coated or painted and operated against foreign material from entering the valve chamber. See requirements for coating in L.13. The coating of flanges and welded end joints shall comply with Appendix G. | 10 Painting | All non-corrosion resistant valves shall be externally coated or painted and operated against foreign material from entering the valve chamber. Corrosion-resistant valves shall not be painted, unless otherwise agreed upon. Flange surface, drive device support flange sealing surface, welded groove ends, inner surface of valve and exposed valve stem shall not be painted, and corrosion protection measures shall be provided. | |
| 12 Tagged | \ | 11 Tagged 5.3 Dimensions | 1. Marks on the valve body shall include: manufacturer trademark, diameter, pressure, material number, furnace number, flow direction, valve series number, ring connection tank number, etc. It shall be done using low stress molding, laser lettering or casting. The marking height shall not be less than 6mm. 2. The marks on the bonnet shall include: material plate number and furnace number. 3. The marks on the nameplate shall include: manufacturer trademark , valve series number, manufacturing date, manufacturing specification, product specification license number (if applicable), diameter, pressure, pressure temperature rating (including maximum and minimum temperature), non-standard structure length, body material, stem material, stem, seat material, supplementary double blocking or isolation test, QSL grade. 4. Other marks: the sealing direction of the valve seat. 5. When the size or shape of the valve is limited, the diameter, pressure, material and manufacturer trademark can be omitted from the valve body. | |
