Yintoni i-SCH (iNombolo yeShedyuli)?

I-SCH imele “iShedyuli,” eyinkqubo yamanani esetyenziswa kwi-American Standard Pipe System ukubonisa ubukhulu bodonga. Isetyenziswa ngokudityaniswa nedayamitha yegama (NPS) ukubonelela ngeendlela ezisemgangathweni zobukhulu bodonga lwemibhobho yobukhulu obahlukeneyo, ukuququzelela uyilo, ukwenziwa, kunye nokukhetha.

 

I-SCH ayibonisi ngokuthe ngqo ubukhulu bodonga kodwa yinkqubo yokuhlela ehambelana nobukhulu bodonga oluthile ngokusebenzisa iitheyibhile ezisemgangathweni (umz., ASME B36.10M, B36.19M).

 

Kumanqanaba okuqala ophuhliso olusemgangathweni, kucetywa uqikelelo lwefomula ukuchaza ubudlelwane phakathi kwe-SCH, uxinzelelo, kunye namandla ezinto eziphathekayo:
I-SCH ≈ 1000 × P / S
Apho:
P - Uxinzelelo loyilo (psi)
S - Uxinzelelo oluvumelekileyo lwezinto (psi)

 

Nangona le fomyula ibonisa unxulumano phakathi koyilo lobungqingqwa bodonga kunye neemeko zokusetyenziswa, ekukhetheni okwenyani, amaxabiso ahambelana nobukhulu bodonga kusafuneka kubhekiselwe kwiitheyibhile eziqhelekileyo.

 

Imvelaphi kunye neMigangatho eNxulumene nayo ye-SCH (iNombolo yeShedyuli)

Inkqubo ye-SCH yaqala yasekwa yi-American National Standards Institute (ANSI) kwaye kamva yamkelwa yi-American Society of Mechanical Engineers (ASME), ifakwe kwi-B36 uchungechunge lwemigangatho, ukubonisa ubudlelwane phakathi kobunzima bodonga lombhobho kunye nobubanzi bombhobho.

 

Okwangoku, imigangatho esetyenziswa ngokuqhelekileyo ibandakanya:

I-ASME B36.10M:
Isebenza kwi-carbon steel kunye nemibhobho yensimbi ye-alloy, egubungela i-SCH 10, 20, 40, 80, 160, njl.;

I-ASME B36.19M:
Isebenza kwimibhobho yensimbi engenasici, kubandakanywa uchungechunge olulula olufana ne-SCH 5S, i-10S, i-40S, njl.

 

Ukwaziswa kwamanani e-SCH kwasombulula umba wokungangqinelani kobukhulu bodonga lokumelwa kuzo zonke iidayamitha ezahlukeneyo, ngokwenjenjalo ukulinganisa uyilo lombhobho.

 

Imelwe njani i-SCH (inombolo yeshedyuli)?

Kwimigangatho yaseMelika, imibhobho idla ngokuchazwa kusetyenziswa ifomathi “NPS + SCH,” efana ne-NPS 2" SCH 40, ebonisa umbhobho onobubanzi obuzii-intshi ezi-2 kunye nobukhulu bodonga obuhambelana nomgangatho we-SCH 40.

NPS: Ubungakanani bombhobho oqhelekileyo, obulinganiswa ngee-intshi, engeyiyo eyona idayamitha yangaphandle kodwa isichongi somda weshishini. Umzekelo, olona bubanzi bangaphandle be-NPS 2" bumalunga ne-60.3 millimeters.

SCH: Ibakala lobungqimba bodonga, apho amanani aphezulu abonisa iindonga ezityebileyo, okukhokelela kumandla ombhobho amakhulu kunye nokumelana noxinzelelo.

Ukusebenzisa i-NPS 2" njengomzekelo, ubukhulu bodonga lwamanani ahlukeneyo e-SCH bumi ngolu hlobo lulandelayo (iiyunithi: mm):

I-SCH 10: 2.77 mm
I-SCH 40: 3.91 mm
I-SCH 80: 5.54 mm

 
【Inqaku eliBalulekileyo】
- I-SCH yinto nje yokutyunjwa, kungekhona umlinganiselo othe ngqo wodonga;
-Imibhobho enegama elifanayo le-SCH kodwa iisayizi ezahlukeneyo ze-NPS zinobunzima bodonga olwahlukeneyo;
- Ukuphakama komlinganiselo we-SCH, udonga lombhobho olutyebileyo kunye nokuphakama koxinzelelo olusebenzayo.