参考文献、1,ISO,11922,1、1997。Thermoplastics,pipes,for,the,conveyance、of。fluids.Dimensions,and,tolerances。Part,1 Metric,series、2,ISO.TR.10839,2000.Polyethylene,pipes,and fittings、for、the,supply of,gaseous、fuels。Code of、practice、for,design,handling.and,installation 3,IEC,60529,2001.Degrees,of.protection provided,by.enclosures,IP、code.4。EN,12117。1997、Plastics.piping,systems,Fittings,valves,and.ancillaries、Determination。of gaseous,flow。rate.pressure、drop、relationships 5。IS0,12176.1.1998、Plastics。pipes.and.fittings,Equipment、for。fusion、jointing.polyethylene。systems,Part,1,Butt,fusion 6,IS0,12l76.2、2000.Plastics,pipes.and。fittings.Equipment,for,fusion,jointing、polyethylene systems.Part.2。Electrofusion、7 EN.1555.3,2002.Plastics.pipimg.systems。for、the。supply of gaseous,fuels、Polyethylene,PE、Part,3 Fittings