Iyini i-SCH (Inombolo Yeshejuli)?

I-SCH imele ukuthi “Schedule,” okuyisimiso sokubala esisetshenziswa ku-American Standard Pipe System ukukhombisa ubukhulu bodonga. Isetshenziswa kanye nobubanzi obujwayelekile (i-NPS) ukuhlinzeka ngezinketho ezijwayelekile zobukhulu bodonga zamapayipi anobukhulu obuhlukene, okwenza kube lula ukuklama, ukukhiqiza, kanye nokukhetha.

 

I-SCH ayibonisi ngqo ubukhulu bodonga kodwa iwuhlelo lokulinganisa oluhambisana nobukhulu bodonga oluthile ngamathebula ajwayelekile (isb., i-ASME B36.10M, i-B36.19M).

 

Ezigabeni zokuqala zokuthuthukiswa okujwayelekile, kwaphakanyiswa ifomula elinganiselayo ukuchaza ubudlelwano phakathi kwe-SCH, ingcindezi, kanye namandla ezinto ezibonakalayo:
I-SCH ≈ 1000 × P / S
Kuphi:
P — Ingcindezi yomklamo (psi)
S — Ukucindezeleka okuvunyelwe kwezinto (psi)

 

Nakuba le fomula ibonisa ubudlelwano phakathi kokwakheka kobukhulu bodonga kanye nezimo zokusetshenziswa, ekukhetheni kwangempela, amanani obukhulu bodonga ahambisanayo kumele abhekwe kumathebula ajwayelekile.

 

Imvelaphi kanye namazinga ahlobene e-SCH (Inombolo Yeshejuli)

Uhlelo lwe-SCH lwasungulwa ekuqaleni yi-American National Standards Institute (ANSI) futhi kamuva lwamukelwa yi-American Society of Mechanical Engineers (ASME), olufakwe ochungechungeni lwezindinganiso ze-B36, ukukhombisa ubudlelwano phakathi kobukhulu bodonga lwamapayipi nobubanzi bamapayipi.

 

Njengamanje, izindinganiso ezivame ukusetshenziswa zifaka:

I-ASME B36.10M:
Kusebenza kumapayipi ensimbi yekhabhoni kanye nensimbi ye-alloy, amboze i-SCH 10, 20, 40, 80, 160, njll.;

I-ASME B36.19M:
Isebenza kumapayipi ensimbi engagqwali, kufaka phakathi uchungechunge olulula njenge-SCH 5S, 10S, 40S, njll.

 

Ukwethulwa kwezinombolo ze-SCH kuxazulule inkinga yokumelwa kobukhulu bodonga okungaguquki kuzo zonke izinhlobo ezahlukene zobubanzi, ngaleyo ndlela kwakhiwa umklamo wepayipi.

 

I-SCH (inombolo yeshejuli) imelelwa kanjani?

Ezindinganisweni zaseMelika, amapayipi ngokuvamile aboniswa kusetshenziswa ifomethi ethi “NPS + SCH,” njenge-NPS 2" SCH 40, ekhombisa ipayipi elinobubanzi obungamasentimitha angu-2 kanye nobukhulu bodonga obuhambisana nezinga le-SCH 40.

I-NPS: Usayizi wepayipi ojwayelekile, olinganiswa ngamasentimitha, okungewona ububanzi bangempela bangaphandle kodwa isihlonzi sobukhulu obujwayelekile embonini. Isibonelo, ububanzi bangempela bangaphandle be-NPS 2" bungaba amamilimitha angu-60.3.

I-SCH: Izinga lokujiya kodonga, lapho izinombolo eziphakeme zibonisa udonga olujiyile, okuholela ekuqineni okukhulu kwamapayipi kanye nokumelana nengcindezi.

Ukusebenzisa i-NPS 2" njengesibonelo, ubukhulu bodonga lwezinombolo ezahlukene ze-SCH bungangokulandelayo (amayunithi: mm):

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

 
【Inothi Elibalulekile】
— I-SCH imane nje iyigama, hhayi ukulinganisa okuqondile kobukhulu bodonga;
— Amapayipi anegama elifanayo le-SCH kodwa osayizi abahlukene be-NPS anobukhulu obuhlukahlukene bodonga;
— Uma isilinganiso se-SCH siphezulu, udonga lwepayipi luba lukhulu futhi isilinganiso sokucindezela esifanele siphezulu.