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