Uchungechunge lokujiya kodonga lwamapayipi ensimbi luvela kuyunithi ye-metrology yaseBrithani, futhi amaphuzu asetshenziselwa ukuveza usayizi.Iukuqina kodonga lweipayipi elingenamthungo lakhiwe uchungechunge lweSheduli (40, 60, 80, 120) futhi lixhunywe kuchungechunge lwesisindo (STD, XS, XXS).Lawa manani aguqulwa abe amamilimitha njengengxenye yochungechunge logqinsi lwamashubhu.(Qaphela: Usayizi - inani leSheduli40 alishintshi, kodwa ukubuka ububanzi obungaphandle beshubhu.)

Indlela yokuveza ububanzi bepayipi nobukhulu, ububanzi obungaphandle begama kanye nobukhulu obuncane bepayipi endaweni yokushisa, i-NPS yepayipi lepayipi kanye nenombolo yeshejuli yodonga lwamapayipi.Uchungechunge lokujiya kodonga luqukethe uchungechunge oluyisi-8 ukusuka ku-10 kuye ku-20, 30, 40, 80, 120, 140, 160. Uchungechunge lwama-40 luwuchungechunge olujwayelekile, lwama-80 luwuchungechunge oluwugqinsi, kanti olu-120 luwugqinsi owengeziwe.uchungechunge.

Ukuqina kodonga lwe-American Standard kanye nezinga lasekhaya lihluke kakhulu.Ngokuvamile, amamaki amabili okucindezela kwe-CL.150 ne-CL.300 awaphezulu.Ngokuvamile, i-SCH10S ne-SCH40 ziyasetshenziswa.Ngaphansi kwama-50 khetha i-SCH80 ne-SCH40S.

I-SCH40, inombolo ye-tube, kungakhathaliseki ukuthi isekhaya noma yangaphandle, i-Sch.XX isetshenziselwa ukukhombisa ukushuba kodonga lwepayipi.I-GB/T81631 HG20553 iphinde ifakwe ku-GB/T81631 HG20553 ejwayelekile kazwelonke, njll., ngokuya ngobubanzi obungaphandle bepayipi noma usayizi wepayipi, ukushuba kodonga lwamasayizi ahlukene aboniswa inombolo yepayipi efanayo kuhlukile.

Indlela yokuveza ukushuba kodonga lwepayipi lensimbi engenamthungo inezindlela ezintathu: usayizi wegeji yepayipi, ubukhulu bodonga lwepayipi lensimbi nesisindo sepayipi:

1) Ubukhulu bodonga buboniswa inombolo yepayipi "Sch".
Inombolo yegeji yepayipi isilinganiso sengcindezi yokuklama ipayipi ekucindezelekeni okuvumelekile kwezinto ezibonakalayo ekushiseni kokuklama okuphindwe ngo-1000 futhi kuyindilinga.Okungukuthi: Sch=P/[σ]t×1000
I-ANSI B36.10 isilinganiso sodonga lokujiya: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 amamaki ayishumi;
I-ANSI B36.19 ibanga lokujiya kodonga: Sch5s, Sch10s, Sch40s, Sch80s amabanga amane;

2) Ngokusho kodonga lwamapayipi ensimbi, i-China, i-ISO, iJapane, ezinye izindinganiso zamapayipi ensimbi ziyamukelwa.

3) Ubukhulu bodonga lwamapayipi buboniswa isisindo sepayipi, esihlukanisa ubukhulu bodonga lwepayipi zibe izinhlobo ezintathu:
a.Ishubhu elijwayelekile lesisindo, elivezwe nge-STD
b ithubhu elijiyile, elivezwe nge-XS
c.Ishubhu eliwugqinsi ngokwengeziwe, elichazwa nge-XXS.
Kumapayipi ane-DN ≤ 250mm, i-Sch40 ilingana ne-STD, i-DN < 200mm ipayipi, i-Sch80 ilingana ne-XS.