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