Iyini i-SCH (Inombolo Yokuhlela)?

I-SCH imele “Ishejuli,” okuwuhlelo lwezinombolo olusetshenziswa ku-American Standard Pipe System ukukhombisa ukujiya kodonga. Isetshenziswa ngokuhambisana ne-nominal diameter (NPS) ukuhlinzeka ngezinketho zokujiya kodonga ezijwayelekile zamapayipi anosayizi abahlukene, ukwenza lula ukuklama, ukukhiqiza, nokukhetha.

 

I-SCH ayikhombisi ngokuqondile ukujiya kodonga kodwa iwuhlelo lokugreda oluhambisana nogqinsi oluthile lwezindonga ngamathebula ajwayelekile (isb., ASME B36.10M, B36.19M).

 

Ezigabeni zokuqala zokuthuthukiswa okujwayelekile, kuhlongozwe ifomula ukuchaza ubudlelwano phakathi kwe-SCH, ingcindezi, namandla wezinto ezibonakalayo:
I-SCH ≈ 1000 × P / S
Kuphi:
P - Ingcindezi yokuklama (psi)
S - Ingcindezi evumelekile yezinto ezibonakalayo (psi)

 

Nakuba le fomula ibonisa ubudlelwano phakathi kwedizayini ukujiya kodonga nezimo zokusetshenziswa, ekukhetheni kwangempela, amanani ahambisanayo ogqinsi lodonga kusafanele akhonjwe kumathebula avamile.

 

Umsuka kanye Namazinga Ahlobene e-SCH (Inombolo Yeshejuli)

Isistimu ye-SCH ekuqaleni yasungulwa yi-American National Standards Institute (ANSI) futhi kamuva yamukelwa yi-American Society of Mechanical Engineers (ASME), yahlanganiswa ochungechungeni lwezindinganiso ze-B36, ukukhombisa ubudlelwano phakathi kobukhulu bodonga lwamapayipi nobubanzi bepayipi.

 

Njengamanje, izindinganiso ezivame ukusetshenziswa zihlanganisa:

I-ASME B36.10M:
Isebenza ku-carbon steel kanye namapayipi ensimbi e-alloy, ehlanganisa i-SCH 10, 20, 40, 80, 160, njll.;

I-ASME B36.19M:
Isebenza kumapayipi ensimbi engagqwali, okuhlanganisa uchungechunge olungasindi olufana ne-SCH 5S, 10S, 40S, njll.

 

Ukwethulwa kwezinombolo ze-SCH kuxazulule inkinga yokumelela ukujiya kodonga okungahambisani kuwo wonke amadayamitha ahlukene okuzisholo, ngaleyo ndlela kulinganisa ukwakheka kwamapayipi.

 

Imelelwa kanjani i-SCH (inombolo yeshejuli)?

Ezindinganisweni zaseMelika, amapayipi ngokuvamile achazwa kusetshenziswa ifomethi ethi “NPS + SCH,” njenge-NPS 2" SCH 40, ebonisa ipayipi elinobubanzi obungu-intshi obungama-intshi angu-2 nogqinsi lodonga oluvumelana nezinga le-SCH 40.

I-NPS: Usayizi wepayipi wokuzisholo, ukalwa ngamayintshi, okungewona ububanzi bangempela bangaphandle kodwa inkomba yobukhulu obujwayelekile bomkhakha. Isibonelo, ububanzi bangempela bangaphandle be-NPS 2" cishe bungamamilimitha angu-60.3.

I-SCH: Ibanga lokujiya kodonga, lapho izinombolo eziphakeme zibonisa izindonga eziwugqinsi, okuholela emandleni amakhulu amapayipi nokumelana nokucindezela.

Ukusebenzisa i-NPS 2" njengesibonelo, ubukhulu bodonga bezinombolo ze-SCH ezihlukene bumi kanje (amayunithi: mm):

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

 
【Inothi Elibalulekile】
- I-SCH iyigama nje, hhayi isilinganiso esiqondile sobukhulu bodonga;
- Amapayipi anegama elifanayo le-SCH kodwa amasayizi ahlukene e-NPS anobukhulu obuhlukahlukene bodonga;
- Ukuphakama kwesilinganiso se-SCH, udonga lwamapayipi lushubile futhi luphakeme ukulinganisa kwengcindezi esebenzayo.