GB 4452-1996 General technical specification for hydrant

GB 4452.1-1984 GB 4452.2-1984 GB 4452.3-1984

GB 4452-2011 Outdoor fire hydrant

GB 6397 GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances GB/T 228-2002 Metallic materials—Tensile testing at ambient temperature GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature GB/T 228.2-2015 Metallic materials—Tensile testing—Part 2:Method of test at elevated temperature GB/T 228.3-2019 Metallic materials—Tensile testing—Part 3:Method of test at low temperature GB/T 228.4-2019 Metallic materials—Tensile testing—Part 4:Method of test in liquid helium GB/T 1176-1987 Specification for cast copper alloys GB/T 1176-2013 Casting copper and copper alloys GB 3265-1995 Fire protection snap connections GB/T 7307-2001 Pipe threads with 55 degree thread angle where pressure-tight joints are not made on the threads GB/T 9439-1988 Grey iron castings GB/T 9439-2010 Grey iron castings GB/T 9439-2023 Grey iron castings GB 12514-1990 Performance requirements and test methods for fire coupling GB 12514.1-2005 Fire coupling—Part 1:General technical conditions for fire coupling GB 12514.2-2006 Fire coupling—Part 2:Patterns and basic parameters for fire snap-types coupling GB 12514.3-2006 Fire coupling—Part 3:Patterns and basic parameters for fire insertion-type coupling GB 12514.4-2006 Fire coupling—Part 4:Patterns and basic parameters for fire screw-type coupling GB 12514-2026 Technical specifications for fire couplings