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