GB/T 45344-2025 General technical requirements for fabricated and prefabricated gas piping used in building

GB/T 196-2003 General purpose metric screw threads—Basic dimensions GB/T 196-2025 General purpose metric screw threads—Basic dimensions GB/T 222-1984 Method of sampling steel for determination of chemical composition and permissible variations for product analysis GB/T 222-2006 Permissible tolerances for chemical composition of steel products GB/T 222-2025 Steels and alloys—Permissible deviations of product analyzed chemical composition GB/T 2828.1-2003 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 2828.1-2012 Sampling procedures for inspection by attributes—Part 1:Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection GB/T 3091-2001 Welded steel pipe for low pressure liquid delivery GB/T 3091-2008 Welded steel pipes for low pressure liquid delivery GB/T 3091-2015 Welded steel pipes for low pressure liquid delivery GB/T 3091-2025 Welded steel pipes for low pressure fluid delivery GB/T 3287-2000 Malleable cast iron pipe fittings GB/T 3287-2011 Malleable cast iron pipe fittings GB/T 3287-2024 Malleable cast iron pipe fittings GB/T 5231-2001 Wrought copper and copper alloys chemical composition limits and forms of wrought products GB/T 5231-2012 Designation and chemical composition of wrought copper and copper alloys GB/T 5231-2022 Designation and chemical composition of wrought copper and copper alloys GB/T 6739-1996 Determination of film hardness by pencil test GB/T 6739-2006 Paints and varnishes—Determination of film hardness by pencil test GB/T 6739-2022 Paints and varnishes—Determination of film hardness by pencil test GB/T 7306.1-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads—Part 1:Parallel internal and taper external threads GB/T 7306.2-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads—Part 2:Taper internal and external threads GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads GB/T 8163-1999 Seamless steel tubes for liquid service GB/T 8163-2008 Seamless steel tubes for liquid service GB/T 8163-2018 Seamless steel pipes for liquid service GB/T 9124.1-2019 Steel pipe flanges—Part 1:PN designated GB/T 9125.1-2020 Fasteners for steel pipe flange joints—Part 1:PN designated GB/T 9126.1-2023 Non-metallic flat gaskets for pipe flanges—Part 1:PN designated GB/T 9128.1-2023 Metallic ring joint gaskets for steel pipe flanges—Part 1:PN designated GB/T 9286-1998 Paints and varnishes—Cross cut test for films GB/T 9286-2021 Paints and varnishes—Cross-cut test GB/T 12459-1990 Steel butt-welding seamless pipe fittings GB/T 12459-2005 Steel butt-welding seamless pipe fittings GB/T 12459-2017 Steel buttwelding pipe fittings—Types and parameter GB/T 12459-2025 Steel buttwelding piping fittings—Types and parameters GB/T 12771-2000 Welded stainless steel pipes for liquid delivery GB/T 12771-2008 Welded stainless steel pipes for liquid delivery GB/T 12771-2019 Welded stainless steel pipes for fluid transport GB/T 13401-1992 Steel plate butt-welding pipe fittings GB/T 13401-2005 Steel plate butt-welding pipe fittings GB/T 13401-2017 Steel buttwelding pipe fittings—Technical specification GB/T 13401-2025 Steel buttwelding piping fittings—Technical specification GB/T 13452.2-1992 Paints and varnishes—Determination of film thickness GB/T 13452.2-2008 Paints and varnishes—Determination of film thickness GB/T 14976-2002 Stainless steel seamless tubes for fluid transport GB/T 14976-2012 Seamless stainless steel pipes for fluid transport GB/T 14976-2025 Seamless stainless steel pipes for fluid transport GB/T 23261-2009 Building sealants for stone GB/T 23658-2009 Elastomeric seals—Material requirement for seals used in pipes and fittings carrying gaseous fuels and hydricarbon fluid GB/T 30308-2013 Fluoroelastomers—General specification and procedure of evaluation GB/T 37594-2019 Technical specification for anti-UV three-layer external fusion powder coating corrosion protection for steel pipe GB/T 42541-2023 Coated steel pipes for gas piping JC/T 482-2022 Polyurethane building sealant JC 482-1992 Polyurethane building sealant NB/T 47013.2-2015 Non-destructive testing of pressure equipment - Part 2: Radiographic testing NB/T 47013.3-2023 Non-destructive testing of pressure equipment - Part 3: Ultrasonic testing NB/T 47013.3-2015 Non-destructive testing of pressure equipment - Part 3: Ultrasonic testing QB/T 4008-2022 Polytetrafluoroethylene Unfused Tape for Thread Sealing (Raw Material Tape) QB/T 4008-2010 Thread seal tape (raw material tape) made of polytetrafluoroethylene