Hauv thaj chaw ntawm cov cua sov hauv cheeb tsam thiab kev thauj mus los hauv cov kav dej, polyurethane- cov kav dej insulated thiab chav dej -cov kav dej insulated (feem ntau hu ua "steel-jacketed steel" kav) yog ob hom kev siv ntau tshaj plaws ntawm prefabricated, ncaj qha - faus insulated piping. Polyurethane-insulated piping-tag nrho xa mus rau prefabricated ncaj qha-fab piping featuring high-density polyethylene (HDPE) txheej casing thiab polyurethane ua npuas ncauj rwb thaiv tsev txheej- muaj peb txheej nruj bonded carriage txheej polyethylene, ib tug insulating txheej ntawm lub tsheb ua npuas ncauj. thiab HDPE sab nraud tiv thaiv casing. Lub pob zeb polyurethane ua npuas ncauj yog tus cwj pwm los ntawm cov thermal conductivity tsis tshua muaj siab, qhov siab kaw - cell ratio, thiab tsis tshua muaj dej nqus, muab ob qho tib si thermal rwb thaiv tsev thiab zoo waterproofing; HDPE txheej txheej tiv thaiv txheej rwb thaiv tsev los ntawm cov dej hauv av corrosion thiab txhua yam puas tsuaj. Feem ntau ntsia los ntawm kev faus ncaj qha - tshem tawm qhov xav tau kev tsim cov khoom siv hluav taws xob thiab tso cai rau kev teeb tsa sai - cov kav dej no feem ntau yog siv hauv nroog hauv nroog cov cua sov kom thauj cov dej kub ntawm qhov kub feem ntau tsis tshaj 120℃. Lawv kuj tsim nyog rau nruab nrab huab cua- cua txias kab thiab kev thauj mus los ntawm ambient - kub xov xwm hauv kev lag luam petrochemical. Chav -cov kav dej rwb thaiv tsev, qhov sib txawv, yog tsim tshwj xeeb rau kev thauj mus los ntawm - qhov kub thiab txias. Nws siv cov qauv "steel-jacketed steel" qauv, qhov twg ob qho tib si sab hauv cov yeeb nkab thiab sab nrauv yog ua los ntawm cov hlau, nrog kev sib xyaw siab -cov ntaub ntawv kub rwb thaiv tsev-xws li centrifugal iav ntaub plaub, aluminium silicate, microporous calcium silicate rau cov txheej txheem ntawm -cov ntaub ntawv kub rwb thaiv tsev{25}}xws li centrifugal iav ntaub plaub, aluminium silicate, microporous calcium silicate, thiab cov txheej txheem ntawm -cov ntaub ntawv kub rwb thaiv tsev, mus txog 350℃thiab cov kev sib txuam siab. Txhawm rau kom haum rau thermal expansion, lub kaw lus suav nrog cov txheej txheem zawv zawg qhov tseeb uas tso cai rau cov yeeb nkab steel sab hauv kom nthuav dav thiab cog lus ywj pheej nyob rau hauv qhov txwv tsis pub muaj kev nyab xeeb. Nrog nws cov hlau txheej sab nrauv muab qhov tshwj xeeb compressive lub zog, hom yeeb nkab no haum rau kev thauj mus los ntev -nyob deb ntawm siab- qhov kub thiab txias hauv cov chaw lag luam xws li cov chaw tsim hluav taws xob, cov nroj tsuag tshuaj, thiab cov chaw muag tshuaj; nws yog qhov tshwj xeeb tshaj yog zoo- haum rau faus rau hauv thaj chaw uas muaj cov av sib sib zog nqus npog lossis nyuaj geological tej yam kev mob. Hauv luv luv, polyurethane- insulated piping yog xaiv rau kev thauj cov dej kub, qhov "steel-jacketed steel" steam-insulated piping yog xav tau rau kev thauj khoom siab -kub.