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