KS : KOREAN INDUSTRIAL STANDARDS
- KS B 1522: Steel Butt-Welding Pipe Fittings for Ordinary use.
- KS B 1541: Steel Butt-Welding Pipe Fittings.
- KS B 1542: Steel Socket-Welding Pipe Fittings.
- KS B 1543: Steel Plate Butt-Welding Pipe Fittings.
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JIS : JAPANESE INDUSTRIAL STANDARDS
- JIS B 2311: Steel Butt-Welding Pipe Fittings for Ordinary use.
- JIS B 2312: Steel Butt-Welding Pipe Fittings.
- JIS B 2313: Steel Plate Butt-Welding Pipe Fittings.
- JIS B 2314: Steel Socket-Welding Pipe Fittings.
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ANSI : AMERICAN NATIONAL STANDARDS INSTITUTE
- ANSI B 16.5: Pipe Flanges and Flanged Fittings.
- ANSI B 16.9: Factory Made Wrought Steel Butt-Welding Fittings.
- ANSI B 16.11: Forged Steel Fittings, Socket-Welding and Threaded.
- ANSI B 16.25: Butt-Welding Ends.
- ANSI B 16.28: Wrought Steel Butt-Welding short Radious Elbow and Returns.
- ANSI B 36.10: Welded and Seamless Wrought Steel Pipe.
- ANSI B 36.19: Stainless Steel Pipe.
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ASTM : AMERICAN SOCIETY FOR TESTING AND MATERIALS
- ASTM A105: Forging, Carbon Steel for Piping Components.
- ASTM A182: Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and valves and Parts for High-Temperature Service.
- ASTM A234: Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and Elevated Temperatures.
- ASTM A350: Forgings Carbon and Low-Alloy Steel, Requiring Notch Toughness Testing for Piping Components.
- ASTM A403: Wrought Austenitic Stainless Steel Piping Fittings.
- ASTM A420: Piping Fittings of Wrought Carbon Steel and Alloy Steel for Low-Temperature Service.
- ASTM A815: Specification for Wrought Ferritic, Ferritic/Austenitic, and Martensitic Stainless Steel Piping Fittings.
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MSS : MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS INDUSTRY
- MSS SP-25: Standard Marking System for Valves, Fittings, Flanges and Unions.
- MSS SP-43: Wrought Stainless Steel Butt-Welding Fittings.
- MSS SP-44: Steel Pipe Line Flanges.
- MSS SP-75: Specification for High Test Wrought Butt-Welding Fittings.
- MSS SP-79: Socket Welding Reducer Inserts.
- MSS SP-83: Carbon Steel Pipe Unions Socket-Welding and Threaded.
- MSS SP-87: Factory-Made Butt-Welding Fittings for Class 1 Nuclear Piping Applications.
- MSS SP-95: Swage(d) Nipples and Bull Plugs.
- MSS SP-97: Integrally Reinforced Forged Branch Outlet Fittings-Socket Welding, Threaded and Butt-Welding Ends.
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ASME : AMERICAN SOCIETY OF MECHANICAL ENGINEERS
- ASME SECTION Ⅱ: Meterials.
- ASME SECTION Ⅲ: Subsection NCA / Division 1 / Division 2
- ASME SECTION Ⅴ: Nondestructive Examination.
- ASME SECTION Ⅷ: Rules for Construction of Pressure Vessels / Division 1, Division 2
- ASME SECTION Ⅸ: Welding and Brazing Qualifications.
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API : AMERICAN PETROLEUM INSTITUTE
- API 5L: Line Pipe.
- API 5LX: High Test Line Pipe.
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