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