1. Cov kav dej xws li dej thiab roj tsheb thauj mus los steel kav (galvanized lossis non-galvanized), cam khwb cia hlau kav thiab cov kav dej yas yuav tsum tau cim nrog lub nominal txoj kab uas hla "DN" (xws li DN15, DN50); De kuj tuaj yeem siv tau thaum phab ntsa thickness koom nrog. Kos npe; noj galvanized welded steel yeeb nkab ua piv txwv, ob txoj kev kos npe ntawm DN thiab De yog raws li hauv qab no: DN20 De25 x 2.5mmDN25 De32 x 3mmDN32 De40 x 4mmDN40 De50 x 4mm, thiab lwm yam ...;
2. Rau seamless steel kav, welded steel kav (ncaj seam los yog kauv seam), tooj liab kav, stainless hlau kav thiab lwm yam kav dej, cov yeeb nkab txoj kab uas hla yuav tsum tau qhia raws li txheej txoj kab uas hla x phab ntsa thickness (xws li De108 x 4, De159 x 4.5. , thiab lwm yam); rau seamless steel kav los yog Non-ferrous hlau kav yuav tsum tau cim nrog "sab nraud txoj kab uas hla x phab ntsa thickness". Piv txwv li, φ108 x 4, φ tuaj yeem raug tshem tawm;
3. Rau cov kav dej xws li cov pob zeb ua kom muaj zog (los yog pob zeb) cov kav dej, cov kav dej av nplaum, cov kav dej acid-resistant ceramic, lub tog raj kheej cov kav dej, cov yeeb nkab txoj kab uas hla yuav tsum tau qhia los ntawm lub puab kab d (xws li d230, d380, thiab lwm yam);
4. Rau cov kav dej yas, cov yeeb nkab txoj kab uas hla yuav tsum tau qhia raws li cov qauv khoom; feem ntau cov kav dej yas tau nthuav tawm raws li txoj kab uas hla. Hauv kev tsim kho tiag tiag, 20, 25, 32 thiab lwm cov kav dej peb luv luv hu rau De, tsis yog DN. Muaj qhov txawv ntawm no. Ib qho specification. Tsis nkag siab nws tuaj yeem ua rau poob yooj yim thaum lub sijhawm kev yuav khoom thiab kev tsim kho;
5. Thaum tus tsim siv lub nominal txoj kab uas hla DN qhia cov yeeb nkab txoj kab uas hla, yuav tsum muaj ib tug sib piv cov lus ntawm nominal txoj kab uas hla DN thiab cov khoom specifications.
