安全验证
:参考文?献 :    】 [1] ISO】 11922-【11997》 Therm—opl?astic》。s pipe—s for t【he convey!ance of【 f:lu:i,。dsDim》ensio》ns and to!leranc—esPa《rt 1Met【ric ser【ie:s,    ! [:2,]  ISO—/TR 108【3920《00 Polye】t,hyl?e,ne p《ip:es and— fitt》。ings for】 the su【p,p,ly ?of gaseo】us fuel【sCod《e, of prac】tice 》for? de?signha—ndling 【a,。nd in》sta?llatio—。n 《 ?    [3]  !IE:。C 6052—92001 De】。grees o【f protec】tion pro】vided by !enclosur】es(IP co】de) —    — [4] 》 EN 1211】719?97: Plastic】s piping !systems【F,i,tting》sval《ves a》。nd a《ncilla—ri:esDetermi!。nat?ion 《o,f gaseous! f:l,ow rate/】pres《sure《。 drop —rela《tion《ships 】 ,    》 [5] 》 IS0 1—。217?6-:11998》 Plas》tics pi【p,es an》d, fi?。tt:i,ngsEqu—ipment fo!r fusion】 joi《nt:ing 《polyet—hylen》e, sys《tems《Part《 1Butt 【fusio》n —。     [—6]  《IS0 《12l76-220!。0,0 Plas—tics pip】es and 【fittings】Equi《pment f【or fusi【。on j《oin?t,ing polye!thylene s!yste《msPart— 2E?lectrofu】s,ion 】。     [7] ! EN 1555-!32002 Pl】a,stics pi】pi:mg sy》stem《s for》 the supp!ly of》 ga?。seous》 fu?elsPolyet!hylene— (P?E)Part 3F!ittings 】 ,