Ntev npaum li cas yog txoj sia ntawm PPR cov yeeb nkab?

Kev tsim lub neej ntawm cov dej txias thiab cov dej kub tuaj yeem hauv pejxeem lub tsev yog 50 xyoo, thiab 100 xyoo yuav tsum muaj nyob rau hauv qee lub nroog engineering. Lub neej txoj kev xa khoom ntawm cov yeeb nkab yog nyob ntawm cov khoom siv xwb, thiab muaj feem xyuam nrog kev kub ntxhov ntawm cov raj xa dej, kev ua haujlwm thiab lub phab ntsa ntawm cov yeeb nkab. Nws yuav tsum tau hais tias nyob rau hauv ib qho kev ntsuas kub ntau, hauv qab kev ua hauj lwm siab, xaiv qhov tsim nyog tuab ntawm PEX yeeb nkab thiab PPR yeeb nkab, nws lub neej kev ua haujlwm yuav muaj ntau tshaj 50 xyoo. Nyob rau hauv no hais txog, peb yuav tsum xyuam xim rau peb qhov chaw. Raws li cov ntaub ntawv yas khoom siv sij hawm ntev ntawm cov kev xeem ntawv ISO / TR9080-1992, qhov xaus ntawm qhov theoretical point of view yog tias lub neej PEX thiab PPR kav lub neej muaj peev xwm lav tau 50 xyoo hauv qhov kub kub ntawm 70 degrees centigrade. Los ntawm German tus qauv DIN16892 / 3, nws yuav pom tau hais tias qhov kev ua hauj lwm tas mus li ntawm PEX yeeb nkab yog 80 CEG nyob rau hauv qhov mob ntawm txoj kev pab lub neej 50 xyoo, thiab qhov ua hauj lwm tas mus li ntawm PPR yeeb nkab yog 70 degrees centigrade .