GB/T 14296-2008 Air cooling and air heating coils

GB/T 14296-1993 Air cooling and air heating coils

GB/T 1047-1995 Nominal size for pipe components GB/T 1047-2005 Pipework components—Definition and selection of DN (nominal size) GB/T 1047-2019 Pipework components—Definition and selection of nominal size GB/T 1804-2000 General tolerances for linear and angular dimensions without individual tolerance indications GB/T 1958-2004 Geometrical product Specifications(GPS)—Geometrical tolerance—Verification prescription GB/T 1958-2017 Geometrical Product Specifications(GPS)—Geometrical tolerance—Verification 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 9119-2000 Slip-on-welding plate steel pipe flanges with flate face or raised face GB/T 9119-2010 Slip-on-welding plate steel pipe flanges GB/T 16803-1997 Equipment of heating, ventilating,air conditioning and air cleaning terminology GB/T 16803-2018 Equipment of heating,ventilating,air conditioning and air cleaning terminology JG/T 21-1999 Test methods for determining the performance of air cooling and air heating coils