Ngokubanzi, ububanzi bombhobho bunokwahlulwa bube bububanzi obungaphandle (De), ububanzi obungaphakathi (D), ububanzi obuqhelekileyo (DN).
Apha ngezantsi kukunika umahluko phakathi kwala mahluko “De, D, DN”.

I-DN bububanzi obuqhelekileyo bombhobho

Qaphela: Olu alulo ububanzi bangaphandle okanye ububanzi bangaphakathi; kufuneka luhambelane nophuhliso lwasekuqaleni lobunjineli bemibhobho kunye neeyunithi zobukhosi; ludla ngokusetyenziswa ukuchaza umbhobho wentsimbi ogqunyiweyo, ohambelana neeyunithi zobukhosi ngolu hlobo lulandelayo:

Umbhobho onamacandelo ama-4: 4/8 intshi: DN15;
Umbhobho wemizuzu emi-6: 6/8 intshi: DN20;
Umbhobho we-intshi e-1: intshi e-1: DN25;
I-intshi ezimbini zombhobho: 1 kunye ne-1/4 intshi: DN32;
Umbhobho wesiqingatha se-intshi: 1 kunye ne-1/2 intshi: DN40;
Umbhobho weesentimitha ezimbini: iisentimitha ezimbini: DN50;
Umbhobho wee-intshi ezintathu: ii-intshi ezi-3: DN80 (iindawo ezininzi zikwabizwa ngokuba yi-DN75);
Umbhobho weesentimitha ezine: iisentimitha ezi-4: DN100;
Umbhobho wentsimbi othutha amanzi, igesi (umbhobho wentsimbi egalelweyookanye umbhobho wentsimbi ongengowe-galvanized), umbhobho wesinyithi othungelweyo, umbhobho odityanisiweyo wentsimbi-plastiki kunye nombhobho we-polyvinyl chloride (PVC) kunye nezinye izinto zombhobho, kufuneka ziphawulwe ngobubanzi obuqhelekileyo "DN" (njenge-DN15, DN20).

 

I-De ibhekisa ikakhulu kububanzi bangaphandle bombhobho
Ukusetyenziswa ngokubanzi kwe-De labeling, kufuneka ilebhelishwe ngohlobo lobubanzi obungaphandle be-X ubukhulu bodonga;

Isetyenziswa kakhulu ukuchaza:umbhobho wentsimbi ongenamthungo, i-PVC kunye neminye imibhobho yeplastiki, kunye neminye imibhobho efuna ubukhulu bodonga obucacileyo.
Umzekelo, thabatha umbhobho wentsimbi odityanisiweyo nge-galvanized, kunye ne-DN, kunye neendlela ezimbini zokulebhelisha zezi zilandelayo:
DN20 De25×2.5mm
DN25 De32×3mm
DN32 De40×4mm
DN40 De50×4mm

......

 

U-D ngokubanzi ubhekisa kububanzi bangaphakathi bombhobho, u-d ubonisa ububanzi bangaphakathi bombhobho wekhonkrithi, kwaye u-Φ ubonisa ububanzi besangqa esiqhelekileyo.

I-Φ ingabonisa nobubanzi bangaphandle bombhobho, kodwa ke kufuneka iphindaphindwe ngobukhulu bodonga.
Umzekelo, i-Φ25×3 ithetha umbhobho onobubanzi obungaphandle obuyi-25mm kunye nobukhulu bodonga obuyi-3mm.
Umbhobho wentsimbi ongenamthungo okanye umbhobho wesinyithi ongenasinyithi, kufuneka ubhalwe “ububanzi bangaphandle × ubukhulu bodonga”.
Umzekelo: Φ107×4, apho Φ inokushiywa khona.
Inxalenye yeTshayina, i-ISO kunye neJapan yokubhala iilebheli zepayipi yentsimbi kusetyenziswa ubukhulu bodonga ukubonisa ubukhulu bodonga lothotho lwepayipi yentsimbi. Kolu hlobo lwepayipi yentsimbi, indlela yokubonakalisa ipayipi ngaphandle ububanzi × ubukhulu bodonga. Umzekelo: Φ60.5×3.8

De, DN, d, ф yoluhlu olufanelekileyo lwentetho!
De-- PPR, PE umbhobho, polypropylene umbhobho OD
Umbhobho we-DN -- i-polyethylene (PVC), umbhobho wesinyithi ophosiweyo, umbhobho odibeneyo wentsimbi-iplastiki, umbhobho wesinyithi ogqunyiweyo ububanzi obuqhelekileyo
d -- ububanzi obuqhelekileyo bombhobho wekhonkrithi
ф -- ububanzi obuqhelekileyo bombhobho wentsimbi engenamthungo