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