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PVC (Polyvinyl Chloride) thiab CPVC (Chlorinated Polyvinyl Chloride) yog ob qho ntawm cov khoom siv dav siv hauv cov kav dej niaj hnub, kev siv dej, thiab kev lag luam. Thaum xub thawj siab ib muag, lawv zoo ib yam li - ob leeg yog lub teeb yuag, corrosion-resistant, thiab yooj yim rau nruab. Txawm li cas los xij, lawv cov yam ntxwv ua tau zoo, tshwj xeeb tshaj yog nyob rau hauv qhov kub thiab txias thiab tshuaj lom neeg kev nyuaj siab, sib txawv heev. Kev nkag siab txog qhov sib txawv ntawm PVC thiab CPVC yeeb nkab fittings pab xaiv cov khoom tsim nyog rau ib daim ntawv thov, kom ntseeg tau ntev -lub sij hawm kev ntseeg siab thiab kev nyab xeeb.
1. Tshuaj muaj pes tsawg leeg thiab kev tsim khoom
Thawj qhov sib txawv ntawm PVC thiab CPVC yog nyob rau hauv lawv cov qauv tshuaj. PVC yog tsim los ntawm vinyl chloride monomers polymerized los tsim cov khoom yas nruj. CPVC, ntawm qhov tod tes, yog tsim los ntawm chlorinating PVC resin, nce nws cov ntsiab lus chlorine los ntawm kwv yees li 56% mus rau 63-69%. Cov tshuaj chlorine ntxiv no hloov cov qauv molecular, ua rau kev txhim kho thermal stability thiab tshuaj tiv thaiv. Cov txheej txheem chlorination kuj hloov xim me ntsis - CPVC feem ntau muaj cov nplaum los yog lub teeb daj daj, thaum PVC feem ntau yog xim dawb lossis grey. Qhov kev hloov kho no ua rau CPVC muaj peev xwm ua tau zoo nyob rau hauv cov xwm txheej uas tus qauv PVC yuav ua tsis tiav.
2. Kev tiv thaiv kub thiab thermal stability
Kev kam rau siab kub yog ib qho tseem ceeb sib txawv ntawm PVC thiab CPVC fittings. PVC cov kav dej thiab fittings feem ntau yog ntsuas rau qhov kev pabcuam kub txog li 60℃(140℃F), uas yog tsim rau cov dej txias, dej, thiab dej. CPVC, txawm li cas los xij, tuaj yeem tswj tau qhov kub thiab txias li 93℃(200℃F) yam tsis muaj zog txhua yam. Qhov kev txwv siab dua no ua rau CPVC zoo tagnrho rau cov kav dej kub thiab cov khoom siv thauj mus los. Qhov kub hloov pauv iav (Tg) hauv CPVC txhais tau tias nws tseem nyob ruaj khov nyob rau hauv thermal expansion, kom ntseeg tau zoo dua thiab txo qhov kev pheej hmoo ntawm deformation nyob rau hauv tshav kub.
3. Kev tiv thaiv tshuaj lom neeg thiab tus cwj pwm corrosion
Ob leeg PVC thiab CPVC muaj kev tiv thaiv zoo heev rau corrosion, scaling, thiab tshuaj tua kab mob. Txawm li cas los xij, CPVC cov ntsiab lus chlorine ntau dua muab kev tiv thaiv zoo rau ntau yam tshuaj lom neeg, suav nrog cov kua qaub, alkalis, thiab cov kuab tshuaj muaj zog. Qhov no ua rau CPVC qhov kev xaiv zoo tshaj plaws hauv cov nroj tsuag ua tshuaj, kev kho dej khib nyiab, thiab cov tshuab hluav taws kub, uas feem ntau ntsib kev tawm tsam. Hauv qhov sib piv, thaum PVC kuj tawm tsam ntau yam tshuaj, nws yuav degrade los yog muag thaum raug cov kua qaub los yog cov kuab tshuaj ntau. Rau kev siv dej haus, CPVC kuj yog qhov zoo vim tias nws tiv thaiv cov tshuaj chlorine-raws li cov tshuaj tua kab mob siv hauv kev kho dej.
4. Mechanical Strength thiab Installation Considerations
Mechanically, ob qho tib si PVC thiab CPVC fittings yog lub teeb yuag tsis tau ruaj khov, muab lub zog tensile zoo thiab cuam tshuam tsis kam. Txawm li cas los xij, CPVC fittings feem ntau yog nruj dua thiab hnyav dua me ntsis vim lawv cov ntsiab lus chlorine ntau dua. Qhov kev ceev ntxiv no txhim kho qhov kev ruaj ntseg thiab txo qhov kev pheej hmoo ntawm kev tawg nyob rau hauv siab lossis kub hloov. Kev teeb tsa kev coj ua zoo sib xws rau ob qho khoom siv, tab sis cov kuab tshuaj cement thiab primers siv sib txawv. CPVC yuav tsum muaj cov kuab tshuaj tshwj xeeb uas tsim los rau qhov kub thiab txias, thaum PVC siv cov txheej txheem primer thiab cement ua ke. Nws yog ib qho tseem ceeb kom tsis txhob hla - siv cov nplaum nplaum, vim qhov no tuaj yeem ua rau kev sib koom ua ke tsis muaj zog.
5. Cov ntawv thov thiab cov nqi txiav txim siab
PVC thiab CPVC txhua tus muaj lawv qhov kev thov zoo tshaj plaws. PVC yog qhov zoo tshaj plaws rau cov kav dej txias, cov kav dej, cov kav dej hluav taws xob, thiab cov kav dej dav dav. CPVC, nrog nws cov peev xwm ua tau zoo dua, yog siv dav hauv cov dej kub thiab txias, hluav taws xob tua hluav taws, thiab cov kab ua lag luam. Txawm hais tias CPVC yog me ntsis kim dua PVC, nws ntev - lub sij hawm kev cia siab nyob rau hauv siab - kub los yog chemically aggressive ib puag ncig feem ntau justifies tus nqi ntxiv. Yog li kev xaiv ntawm ob cov ntaub ntawv yuav tsum yog raws li kev ua haujlwm kub, kev xav tau siab, thiab hom kua dej xa tawm.
Xaus
Thaum PVC thiab CPVC yeeb nkab fittings muaj ntau qhov sib xws, lawv qhov kev ua tau zoo sib txawv yog qhov tseem ceeb hauv kev siv tiag - ntiaj teb no. CPVC cov ntsiab lus kho cov tshuaj chlorine ua rau nws zoo dua cov cua sov ua haujlwm, tshuaj lom neeg ua haujlwm ntev, thiab lub zog siv tshuab, ua rau nws tsim nyog rau kev xav tau kev lag luam thiab thaj chaw siv. PVC tseem yog tus nqi- siv tau zoo thiab muaj ntau yam kev xaiv rau qis dua -kub tshuab thiab cov kav dej dav dav. Los ntawm kev nkag siab txog cov khoom tshwj xeeb ntawm txhua yam khoom, engineers, cov neeg cog lus, thiab cov tswv tsev tuaj yeem txiav txim siab kom paub meej tias muaj kev nyab xeeb, ua haujlwm tau zoo, thiab siv tau ntev hauv kev tsim cov kav dej.