Txawm hais tias koj tab tom tsim lossis kho lub tsev, xaiv cov khoom siv kav dej uas tsim nyog tshaj plaws yog qhov tseem ceeb kom muaj cov kav dej ua haujlwm tau zoo yam tsis muaj teeb meem rau ntau xyoo tom ntej. Txawm hais tias muaj ntau yam khoom siv hauv cov kav dej hauv kev lag luam niaj hnub no, PEX tau siv ntau dua hauv kev siv cov kav dej hauv tsev thiab kev lag luam.
Yog vim li cas siv PEX piping
PEX, uas sawv cev rau cross-linked polyethylene, yog cov khoom siv yas uas muaj qee qhov zoo dua lwm cov kav dej, suav nrog tooj liab, galvanized steel, PVC, thiab CPVC. Yuav kom nkag siab tias yog vim li cas ntau thiab ntau tus kws tshaj lij thiab cov tswv tsev xaiv PEX tshaj lwm cov khoom siv kav dej, cia peb saib xyuas nws cov khoom.
Kev hloov pauv ntawm PEX piping
PEX yog hloov tau txaus los khoov 90 degrees yam tsis muaj khoom siv ntxiv. Hauv qhov sib piv, cov khoom siv tsis zoo, xws li tooj liab, galvanized steel, PVC, thiab CPVC, tsis tuaj yeem khoov ntawm cov khoom siv. Ntxiv nrog rau kev ncua sij hawm tsim kho thiab ntxiv rau tag nrho cov nqi ntawm qhov project, txiav cov kav dej thiab kev txhim kho fittings tuaj yeem ua rau cov dej xau tom qab phab ntsa. PEX tuaj yeem txo qhov kev pheej hmoo ntawm cov xwm txheej no tshwm sim. Txhawm rau txo qhov kev pheej hmoo ntawm cov dej xau, cov kav dej tuaj yeem siv PEX cov yeeb nkab manifolds thiab sib cais, tsis muaj kev cuam tshuam PEX kab los txuas cov kab dej loj rau txhua qhov kev sib tw lossis pab pawg sib tw. Piv txwv li, nrog manifolds thiab nruamPEX lub cev, cais cov kab dej tuaj yeem txuas nrog koj chav ua noj, chav ntxhua khaub ncaws, thiab txhua chav dej.
Ntxiv rau qhov ua kom yooj yim ntawm cov txheej txheem kev teeb tsa, PEX yog sib xws nrog ntau cov khoom siv, xws li tooj liab, galvanized steel, PVC, thiab CPVC. Qhov no tso cai rau koj hloov los ntawm lwm cov ntaub ntawv mus rau PEX thiab rov ua dua raws li koj qhov project specifications.
Thermal conductivity
Vim tias cov kav dej kuj tseem siv los thauj cov dej kub hauv cov kav dej, nws tseem ceeb heev kom ntseeg tau tias cov khoom siv yeeb nkab uas koj xaiv tuaj yeem tiv taus qhov kub thiab txias. Ua ntej, ASTM tsis pom zooPVC cevrau cov ntawv thov nrog kub siab tshaj 140 degree F. Rau cov dej kub saum toj no, cov kws tshaj lij pom zoo rau tooj liab, galvanized steel, CPVC, lossis PEX yeeb nkab, uas tuaj yeem tiv taus dej kub txog 200 degree F.
Tsis tas li ntawd, hlau yog cov conductors zoo ntawm tshav kub. Piv txwv li, uninsulated tooj liab thiab galvanized steel yeeb nkab yuav poob 22 mus rau 34 BTUs ib teev twg ib ko taw. Yog li ntawd, cov kav dej hlau uas tsis zoo insulated tuaj yeem poob ntau ntawm cov cua sov, ua rau koj cov nqi zog. Txawm hais tias PEX kuj poob qee qhov cua sov rau ib puag ncig, nws muaj qhov thermal conductivity qis dua hlau. Txawm li cas los xij, cov dej kub hloov pauv ntawm cov dej kub ntws los ntawm cov kav dej PEX tsis yog nyob ntawm qhov thermal kuj ntawm cov khoom, tab sis kuj nyob rau ntawm cov yeeb nkab phab ntsa xaiv thiab cov khoom siv rwb thaiv tsev.
Tus nqi ntawm PEX tubing
PEX tsis tshua kim dua tooj liab thiab galvanized steel yeeb nkab, thiab hais txog tib tus nqi li PVC thiab CPVC yeeb nkab. Txawm li cas los xij, "PEX yeeb nkab" yog cov ntsiab lus dav dav uas suav nrog peb pawg yeeb nkab nrog cov yam ntxwv sib txawv thiab cov nqi sib txawv.
1. PEX-A kav, tsim siv txoj kev "thermal" crosslinking. Txoj kev koom nrog crosslinking polyethylene molecules ntawm qhov kub siab tshaj qhov melting point ntawm polymers siv. PEX-A yeeb nkab yog hloov tau ntau dua li PEX-B thiab PEX-C yeeb nkab, nthuav tawm lossis cog lus ntau dua thaum raug dej kub lossis dej txias. Hom yeeb nkab no kuj muaj qhov siab tshaj plaws tiv thaiv kev tawg thaum kub poob hauv qab khov. Muab nws cov yam ntxwv tshwj xeeb, nws yooj yim pom vim li cas PEX-A kim dua PEX-B thiab PEX-C yeeb nkab.
2. Cov kav dej PEX-B yog tsim los ntawm kev tso cov kav dej hauv cov dej kub da dej tom qab siv cov catalyst hauv cov txheej txheem extrusion. PEX-B yog nruj dua PEX-A vim yog kev sib txuas ntawm molecular ntawm 65 feem pua thiab 70 feem pua. Yog li, PEX-B tsis o zoo li PEX-A.
3.PEX-C cov kav dej yog tsim los nrog kev pab ntawm cov hluav taws xob hluav taws xob hluav taws xob, uas rhuav tshem cov kev sib txuas uas twb muaj lawm ntawm cov molecules thiab tsim cov kev sib txuas tshiab. Nrog rau qhov tsawg kawg ntawm kev sib txuas, qhov no yog qhov kev xaiv cov kav dej nruj tshaj plaws, nws yooj yim rau kinks thiab tawg hauv qhov khov.
Durability ntawm PEX piping
Piv rau tooj liab thiab galvanized steel kav uas yog nquag corrode, xeb thiab sib sau cov pob zeb hauv av vim raug dej ntev, PEX muaj kev tiv thaiv xeb, corrosion, scaling thiab lwm yam kev puas tsuaj uas dej tuaj yeem ua rau. Yog li, PEX piping tiv thaiv cov teeb meem xws li dej discoloration, metallic saj, yeeb nkab suab nrov, tsis tshua muaj dej siab, thiab cov yeeb nkab tawg.
PEX piping txwv
Zoo li PVC thiab CPVC, PEX tawg nyob rau hauv UV hluav taws xob. Tsis tas li ntawd, PEX piping muaj qhov cuam tshuam rau kev puas tsuaj los ntawm huab cua kub, nplaim taws, muaj cov tshuaj chlorine siab, thiab cov kab mob. Piv txwv li, qee yam khoom siv roj av lossis cov khoom siv ntxhia tuaj yeem hloov kho cov tshuaj muaj pes tsawg leeg ntawm PEX, uas tuaj yeem ua rau cov kav dej thiab cov khoom puas.
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