1. Cov yeeb nkab dej hauv qab ntawm lub tais zaub tau txais cov yeeb nkab PVC, uas muaj cov dej thim rov qab thiab tsis rov qab los tsw. Cov yeeb nkab dej hauv qab cov tais zaub tuaj yeem siv PVC50 cov kav dej kom ntseeg tau cov dej phwj tuaj sai. Cov dej xau, cov yeeb nkab PVC hauv qab lub dab dej hauv chav ua noj muaj lub neej ua haujlwm ntev dua, tag nrho cov kav dej hauv qab lub dab dej hauv chav ua noj yog kaw, thiab cov kab noj hniav yog tsim ncaj qha nce thiab nqis, yog li txo txoj hauv kev ntawm cov yeeb nkab thaiv.
2. Thaum lub sij hawm ntawm kev yuav khoom, lub chav ua noj cov kav dej specifications yog 75 thiab 90, uas yog ib tug txheej txoj kab uas hla ntawm dn, yog li nws yuav tsis tau raws li qhov qhab nia. Feem ntau hais lus, ob peb feeb thiab ob peb nti yog ncaj qha ntsig txog cov welded steel yeeb nkab, feem ntau vim hais tias thaum lub welded steel yeeb nkab ua tiav, cov xov hauv cov yeeb nkab yog ib nti xov. Tom qab ntawd muaj lub tswv yim ntawm ob peb feeb thiab ob peb ntiv tes. PVC-U cov kav dej phwj yog muab tso rau, yog li tsis muaj qhov zoo li ob peb feeb thiab ob peb ntiv tes.
3. Yog hais tias chav tsev me me tsis meej thaum lub sijhawm yuav khoom, nws zoo li qhov kev teeb tsa ntawm chav ua noj cov kav dej tsis zoo. Piv txwv li, PVC-U yeeb nkab nrog ib txoj kab uas hla ntawm 90 hli yog hu ua 90-degree PVC yeeb nkab. Yog tias cov yeeb nkab PVC-U txuas nrog cov yeeb nkab hlau cam khwb cia, cov yeeb nkab sib txuas yog DN75. Hauv kev sib pauv, nws tsis tsim nyog hu rau PVC-U yeeb nkab nrog nominal txheej kab ntawm dn90 mm li 75.