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:参考文献 —     [!1]: ISO 》。1,。1,9,22-119—97 Thermo!plasti—cs pipe【s, for《 the c—onveyance! of 《fl:uidsDimen!sio?。。ns and to!lerances】Part《 1Met》。ric se—ries 【     [2!] : IS?O/T?R 108》。3920《00 P《。oly?ethyl》ene pip【。es:。。 a:nd fi》tting》s fo《r the sup!p,ly of —g,aseous fu!elsCo》de of pr】act?ice fo—r des》ignha》。ndlin》g an《d inst—allati—on: ?    — [3]《  :IEC 6》052?92001 De】gree《s of p—。rotecti【on provid!ed by en】cl:。osure》s,(IP code】)  】   [4]—  :EN 1《21171997 !P,l,astics 【pipin》g syste【msFit》t,ingsva—lves a—nd ?ancilla【riesDete】rminatio】。n :of ?gaseous 】flow ra【te/pre—ss:ure d》r,op ?relatio【nsh?ips 》 《   ? [5]  —IS0 1217】。。6-11998 P!lastics【 pi?。pes and 】fitting【。sEquipmen!t fo《r f?u,sion 》j,oin?t,ing p》olyethyle!ne s《ystemsPar!t 1Butt 】fusio》n, ?     [6!]  IS0 【。1,2l:。76-22000】。 Plasti【cs ?pipes —and fitt】i,ngsEqu—i,pment》。 for f—usion —jointing】 ,polyethyl!ene syst】emsPa》rt 2Elect!rofu《sion !    《 ,[7]  EN 】1,555-《32002 Pl】ast?ics? pi?pimg sys】tems 》for the 】supply of! gaseo—us ?fue?l,sPol《yeth《。ylene (P】E)Part 3】Fittings】 :