Pipe fittings are the parts that play the roles of connection, control, direction change, diversion, sealing and support in the pipeline system. For the convenience of use, conventional pipe fittings will be made according to the standard size. There are generally three ways to express the size of pipe fittings: nominal diameter (inch), DN+ number and nominal outer diameter (outer diameter), and their corresponding tables are as follows:
Nominal diameter (inch) DN Nominal outside diameter (outside diameter) mm1/2''1.33/4'' 2026.71''2533.41and/kloc-.
What are the national standards for pipe fittings?
GB/T 10752- 1995 butt welded joint of marine steel pipe.
GB/T 12772- 1999 Flexible joint cast iron pipes and fittings for drainage.
GB/T8803-200 1 hot oven test method for injection molded rigid polyvinyl chloride (PVC-U), chlorinated polyvinyl chloride (PVC-C), acrylonitrile-butadiene-styrene terpolymer (ABS) and acrylonitrile-styrene-acrylate terpolymer (ASA).
GB/T8802-200 1 determination of vicat softening temperature of thermoplastic pipes and fittings
GB/T 1825 1-2000 determination method of pigment or carbon black dispersion in polyolefin pipes, fittings and mixtures
GB/T 18474-200 1 test method for crosslinking degree of crosslinked polyethylene (PE-X) pipes and fittings.
GB/T 18475-200 1 classification and nomenclature of thermoplastic pressure pipes and fittings, overall use (design) coefficient.
Polypropylene piping system for hot and cold water-Part 3: Pipe fittings.
GB/T 1899 1-2003 thermoplastic pipes and fittings for hot and cold water systems.
Chlorinated polyvinyl chloride (PVC-C) piping system for hot and cold water Part 3: Pipe fittings.
Chlorinated polyvinyl chloride (PVC-C) piping system for industrial use Part 3: Pipe fittings.
Rubber o-ring for stainless steel clamping fittings.
GB/T 19278-2003 general terms and definitions of thermoplastic pipes, fittings and valves
GB/T 19473.3-2004 polybutylene (PB) piping system for hot and cold water Part 3: pipe fittings.
GB/T 12459-2005 welded seamless steel pipe fittings
GB/T 197 12-2005 polyethylene (PE) saddle bypass impact test method for plastic pipes and fittings
GB 15558.2-2005 Buried polyethylene pipeline system for gas Part 2: Pipe fittings
GB/T 13663.2-2005 water supply polyethylene pipeline system part 2: pipe fittings
GB/T 19806-2005 extrusion peeling test of polyethylene electrofusion components for plastic pipes and fittings
GB/T 19807-2005 preparation of composite samples of plastic pipes and fittings, polyethylene pipes and electrofusion fittings
GB/T 19808-2005 tensile peeling test of polyethylene electrofusion components with nominal external diameter greater than or equal to 90mm for plastic pipes and fittings.
GB/T 19809-2005 preparation of polyethylene (PE) pipe/pipe or pipe/pipe hot-melt butt joint components for plastic pipes.
GB/T 198 10-2005 determination of tensile strength and failure form of hot-melt butt joint of polyethylene (PE) pipes and fittings
GB/T 1340 1-2005 Butt-welded pipe fittings made of steel plates
GB/T 19993-2005 thermal cycle test method for thermoplastic piping system pipe and pipe fitting combination system for cold and hot water.
GB/T5836.2-2006 rigid polyvinyl chloride (PVC-U) pipe fittings for building drainage
GB/T 158 19-2006 Test method and technical requirements for environmental stress cracking sensitivity of polyethylene (PE) pipes for irrigation.
GB/T2020 1-2006 mechanical connection fittings for polyethylene pressure pipes for irrigation.
GB/T20207.2-2006 Acrylonitrile-Butadiene-Styrene (ABS) Pressure Piping System Part 2: Fittings
GB/T20674.2-2006 Ultrasonic welding machine for polyethylene plastic pipes and fittings Part 2: Electrofusion connection.
GB/T20674. 1-2006 ultrasonic welding machine for polyethylene plastic pipes and fittings part 1: hot-melt butt joint.
GB/T880 1-2007 drop test method for rigid polyvinyl chloride (PVC-U) pipe fittings.
GB/T2 1300-2007 determination of opacity of plastic pipes and fittings
GB/T2 1409-2008 General Provisions on Inspection, Installation and Use of Glass Equipment, Pipes and Accessories
GB/T2 1408-2008 Glass Equipment, Pipes and Accessories; The universality and interchangeability of 15 mm ~ 150 mm pipe fittings.
GB/T 14383-2008 Forged Socket Welded and Threaded Pipe Fittings
GB/T 13295-2008 ductile iron pipes, fittings and accessories for water and gas pipelines
Technical drawings-Graphical symbols for piping systems-Fittings
GB/T2205 1-2008 cross-linked polyethylene (PE-X) pipe cold expansion joint with sliding clamp.
Graphical symbols for technical drawings piping systems; axonometric drawings of graphical symbols such as pipes, fittings and valves.
Gb/t 11618.1-2008 copper pipe joints part1:brazed fittings.
GB/T 12772-2008 Flexible connection cast iron pipes, fittings and accessories for drainage.
GB/T3420-2008 Gray cast iron pipe fittings
Gb/t11618.2-2008 copper pipe joints part 2: clamping fittings.
GB/T2324 1-2009 Basic parameters and technical conditions of plastic pipes and fittings for irrigation.
GB/T23682-2009 Requirements, design and installation of hoses, isolation pipes and expansion joints for refrigeration systems and heat pumps.
GB/T24452-2009 chlorinated polyvinyl chloride (PVC-C) pipes and fittings for construction sewage and wastewater (high and low temperature)
GB/T 17457-2009 Cement Mortar Lining for Ductile Iron Pipe and Fittings
Polyurethane coating for ductile iron pipes and fittings
GB/T24672-2009 Metal thin-walled pipes and fittings for sprinkler irrigation
Gb/t 5135. 19-2010 automatic sprinkler system part19: plastic pipes and fittings.
GB/T26002-20 10 Stainless steel corrugated hoses and fittings for gas transmission.
GB/T26 120-20 10 low-pressure stainless steel threaded pipe fittings
GB/T2608 1-20 10 ductile iron pipes, fittings and accessories for sewage.
GB26255.2-20 10 Mechanical pipe fittings for polyethylene pipeline system for gas Part 2: Steel-plastic conversion pipe fittings for pipelines with nominal outer diameter greater than 63 mm.
GB26255. 1-20 10 mechanical pipe fittings for polyethylene pipeline system for gas Part 1: steel-plastic conversion pipe fittings for pipelines with nominal external diameter not greater than 63mm.
GB/T26500-20 1 1 general technical requirements for fluoroplastic steel pipes and fittings.
Gb/t19228.2-201stainless steel clamping fittings part 2: thin-walled stainless steel pipes for connection.
Gb/t19228.1-201stainless steel clamping fittings part 65438: clamping fittings.
GB/T27684-20 1 1 titanium and titanium alloy seamless and welded pipe fittings.
Gb/t27891-2011carbon steel clamping pipe fittings