Yintoni i-SCH (iNombolo yeShedyuli)?

I-SCH imele igama elithi “Schedule,” eliyinkqubo yokubala esetyenziswa kwi-American Standard Pipe System ukubonisa ubukhulu bodonga. Isetyenziswa kunye ne-nominal diameter (NPS) ukubonelela ngeendlela eziqhelekileyo zobukhulu bodonga kwiipayipi zobukhulu obahlukeneyo, okwenza kube lula ukuyila, ukuvelisa kunye nokukhetha.

 

I-SCH ayibonisi ngokuthe ngqo ubukhulu bodonga kodwa yinkqubo yokubeka amanqaku ehambelana nobukhulu bodonga oluthile ngeetafile ezimiselweyo (umz., i-ASME B36.10M, i-B36.19M).

 

Kwinqanaba lokuqala lophuhliso olusemgangathweni, kwacetyiswa ifomula eqikelelweyo ukuchaza ubudlelwane phakathi kwe-SCH, uxinzelelo, kunye namandla ezinto ezibonakalayo:
I-SCH ≈ 1000 × P / S
Apho:
P — Uxinzelelo loyilo (psi)
S — Uxinzelelo oluvumelekileyo lwezinto (psi)

 

Nangona le fomula ibonisa ulwalamano phakathi koyilo lobukhulu bodonga kunye neemeko zokusetyenziswa, ekukhetheni ngokwenene, amaxabiso obukhulu bodonga ahambelanayo kufuneka abhekwe kwiitheyibhile eziqhelekileyo.

 

Imvelaphi kunye neMigangatho eNxulumeneyo ye-SCH (Inombolo yeShedyuli)

Inkqubo ye-SCH yaqalwa yasekwa yi-American National Standards Institute (ANSI) yaza kamva yamkelwa yi-American Society of Mechanical Engineers (ASME), yafakwa kuluhlu lwemigangatho ye-B36, ukubonisa ulwalamano phakathi kobukhulu bodonga lombhobho kunye nobubanzi bombhobho.

 

Okwangoku, imigangatho esetyenziswa rhoqo ibandakanya:

I-ASME B36.10M:
Isebenza kwimibhobho yentsimbi yekhabhoni kunye nentsimbi ye-alloy, egubungela i-SCH 10, 20, 40, 80, 160, njl.;

I-ASME B36.19M:
Isebenza kwiipayipi zentsimbi engagqwaliyo, kuquka uthotho olukhaphukhaphu olufana ne-SCH 5S, 10S, 40S, njl.

 

Ukwaziswa kwamanani e-SCH kusombulule umba wokubonakaliswa kobukhulu bodonga obungaguqukiyo kwiidayamitha ezahlukeneyo, ngaloo ndlela kwenziwa uyilo lwemibhobho lube semgangathweni.

 

Imeleka njani i-SCH (inombolo yeshedyuli)?

Kwimigangatho yaseMelika, iipayipi zihlala zibonakaliswa kusetyenziswa ifomathi ethi “NPS + SCH,” efana ne-NPS 2" SCH 40, ebonisa ipayipi enobubanzi obuqhelekileyo obuzii-intshi ezi-2 kunye nobukhulu bodonga obuhambelana nomgangatho we-SCH 40.

I-NPS: Ubungakanani bombhobho oqhelekileyo, obulinganiswa ngee-intshi, obungengobubanzi bangaphandle bokwenyani kodwa buphawu lokulinganisa olusemgangathweni weshishini. Umzekelo, ububanzi bangaphandle bokwenyani be-NPS 2" bumalunga neemilimitha ezingama-60.3.

I-SCH: Ubungakanani bobukhulu bodonga, apho amanani aphezulu abonisa udonga olutyebileyo, nto leyo ebangela amandla amakhulu emibhobho kunye nokumelana noxinzelelo.

Ukusebenzisa i-NPS 2" njengomzekelo, ubukhulu bodonga lwamanani ahlukeneyo e-SCH bulandelayo (iiyunithi: mm):

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

 
【Inqaku Elibalulekileyo】
— I-SCH sisichazi-magama nje, asikokulinganisa ngokuthe ngqo ubukhulu bodonga;
— Iipayipi ezinegama elifanayo le-SCH kodwa ubungakanani obahlukeneyo be-NPS bunobukhulu obahlukeneyo bodonga;
— Okukhona umlinganiselo we-SCH uphezulu, kokukhona udonga lombhobho lutyebile kwaye umlinganiselo woxinzelelo olufunekayo uphezulu.