Feem ntau hais lus, txoj kab uas hla ntawm cov yeeb nkab tuaj yeem muab faib ua txoj kab uas hla sab nraud (De), txoj kab uas hla sab hauv (D), txoj kab uas hla nominal (DN).
Hauv qab no yog qhia koj txog qhov sib txawv ntawm "De, D, DN" no.
DN yog lub nominal diameter ntawm cov yeeb nkab
Lus Cim: Qhov no tsis yog sab nraud txoj kab uas hla los yog sab hauv txoj kab uas hla; yuav tsum muaj feem cuam tshuam nrog kev txhim kho thaum ntxov ntawm kev tsim kho kav dej thiab cov chav tsev imperial; feem ntau yog siv los piav qhia txog cov yeeb nkab hlau galvanized, uas sib raug rau cov chav tsev imperial raws li hauv qab no:
4-ntu yeeb nkab: 4/8 nti: DN15;
Yeeb nkab 6-feeb: 6/8 nti: DN20;
1 nti yeeb nkab: 1 nti: DN25;
Nti ob lub yeeb nkab: 1 thiab 1/4 nti: DN32;
Ib nrab nti yeeb nkab: 1 thiab 1/2 nti: DN40;
Ob nti yeeb nkab: 2 nti: DN50;
Cov yeeb nkab peb-nti: 3 nti: DN80 (ntau qhov chaw kuj muaj npe hu ua DN75);
Cov yeeb nkab plaub nti: 4 nti: DN100;
Cov yeeb nkab hlau xa dej, roj (cov yeeb nkab hlau galvanizedlos yog cov yeeb nkab hlau uas tsis yog galvanized), cov yeeb nkab hlau cam khwb cia, cov yeeb nkab hlau-yas sib xyaw thiab cov yeeb nkab polyvinyl chloride (PVC) thiab lwm yam khoom siv yeeb nkab, yuav tsum tau cim nrog lub cheeb nominal "DN" (xws li DN15, DN20).
De feem ntau yog hais txog lub cheeb sab nraud ntawm cov yeeb nkab
Kev siv dav dav ntawm De labeling, yuav tsum tau sau rau hauv daim ntawv ntawm sab nraud txoj kab uas hla X phab ntsa tuab;
Feem ntau siv los piav qhia:cov yeeb nkab hlau tsis muaj seamless, PVC thiab lwm yam kav dej yas, thiab lwm yam kav dej uas xav tau lub phab ntsa tuab.
Piv txwv li, siv cov yeeb nkab galvanized welded steel, nrog DN, De ob txoj kev sau npe yog raws li nram no:
DN20 De25 × 2.5 hli
DN25 De32 × 3 hli
DN32 De40 × 4 hli
DN40 De50 × 4 hli
......
D feem ntau yog hais txog txoj kab uas hla sab hauv ntawm cov yeeb nkab, d qhia txog txoj kab uas hla sab hauv ntawm cov yeeb nkab ua vaj tse, thiab Φ qhia txog txoj kab uas hla ntawm lub voj voog ib txwm muaj.
Φ kuj tseem tuaj yeem qhia qhov txoj kab uas hla sab nraud ntawm cov yeeb nkab, tab sis tom qab ntawd nws yuav tsum tau muab sib npaug los ntawm phab ntsa tuab.
Piv txwv li, Φ25 × 3 txhais tau tias yog cov yeeb nkab uas muaj sab nraud txoj kab uas hla ntawm 25 hli thiab phab ntsa tuab ntawm 3 hli.
Cov yeeb nkab hlau tsis muaj qhov sib txuas lossis cov yeeb nkab hlau uas tsis yog hlau, yuav tsum tau cim "txoj kab uas hla sab nraud × tuab ntawm phab ntsa".
Piv txwv li: Φ107 × 4, qhov twg Φ tuaj yeem raug tshem tawm.
Tuam Tshoj, ISO thiab Nyiv Pooj cov yeeb nkab hlau siv cov qhov ntev ntawm phab ntsa los qhia qhov tuab ntawm phab ntsa ntawm cov yeeb nkab hlau. Rau hom yeeb nkab hlau no, txoj kev qhia rau cov yeeb nkab sab nraud txoj kab uas hla × phab ntsa tuab. Piv txwv li: Φ60.5 × 3.8
De, DN, d, ф ntawm qhov ntau ntawm kev qhia tawm!
De-- PPR, PE yeeb nkab, polypropylene yeeb nkab OD
DN -- polyethylene (PVC) yeeb nkab, yeeb nkab hlau cam khwb cia, yeeb nkab hlau-yas sib xyaw, yeeb nkab hlau galvanized nominal txoj kab uas hla
d -- lub nominal txoj kab uas hla ntawm cov yeeb nkab ua vaj tse
ф -- seamless steel yeeb nkab nominal txoj kab uas hla
Lub sijhawm tshaj tawm: Lub Ib Hlis-10-2025
