SCH (Schedule Number) yog dab tsi?

SCH stands rau "Schedule," uas yog ib tug lej siv nyob rau hauv American Standard Pipe System los qhia cov phab ntsa thickness. Nws yog siv ua ke nrog nominal txoj kab uas hla (NPS) los muab cov txheej txheem phab ntsa thickness xaiv rau cov kav dej ntawm qhov sib txawv, yooj yim tsim, tsim, thiab xaiv.

 

SCH tsis ncaj qha qhia cov phab ntsa tuab tab sis yog cov txheej txheem muab qhab nia uas sib haum rau cov phab ntsa tshwj xeeb los ntawm cov rooj ua qauv (xws li ASME B36.10M, B36.19M).

 

Nyob rau theem pib ntawm kev txhim kho tus qauv, kwv yees cov qauv raug npaj los piav qhia txog kev sib raug zoo ntawm SCH, siab, thiab cov khoom siv zog:
SCH ≈ 1000 × P / S
Qhov twg:
P - Tsim siab (psi)
S - Tso cai rau kev ntxhov siab ntawm cov khoom (psi)

 

Txawm hais tias cov qauv no qhia txog kev sib raug zoo ntawm cov phab ntsa thickness tsim thiab kev siv cov xwm txheej, hauv kev xaiv tiag tiag, cov khoom siv phab ntsa thickness tseem yuav tsum tau hais los ntawm cov rooj sib tham.

 

Keeb Kwm thiab Lwm Cov Qauv ntawm SCH (Schedule Number)

Lub SCH system yog tsim los ntawm American National Standards Institute (ANSI) thiab tom qab ntawd tau txais los ntawm American Society of Mechanical Engineers (ASME), muab tso rau hauv B36 series ntawm cov qauv, los qhia txog kev sib raug zoo ntawm cov yeeb nkab phab ntsa thickness thiab cov yeeb nkab txoj kab uas hla.

 

Tam sim no, cov qauv siv feem ntau suav nrog:

ASME B36.10M:
Muaj feem xyuam rau carbon steel thiab alloy steel kav, npog SCH 10, 20, 40, 80, 160, thiab lwm yam;

ASME B36.19M:
Muaj feem xyuam rau cov kav hlau tsis muaj steel, nrog rau cov khoom hnyav xws li SCH 5S, 10S, 40S, thiab lwm yam.

 

Kev taw qhia ntawm SCH cov lej daws qhov teeb meem ntawm qhov tsis sib xws ntawm phab ntsa tuab sawv cev hla cov kab sib txawv nominal, yog li tsim qauv tsim cov kav dej.

 

SCH (schedule number) sawv cev li cas?

Hauv Asmeskas cov qauv, cov raj xa dej feem ntau yog siv hom "NPS + SCH," xws li NPS 2 "SCH 40, qhia txog lub raj xa dej nrog lub taub nominal ntawm 2 ntiv tes thiab phab ntsa tuab ua raws li SCH 40 tus qauv.

NPS: Nominal yeeb nkab loj, ntsuas hauv ntiv tes, uas tsis yog qhov tseeb sab nraud tab sis tus qauv kev lag luam-tus qauv ntsuas qhov ntev. Piv txwv li, qhov tseeb sab nraud ntawm NPS 2 "yog kwv yees li 60.3 millimeters.

SCH: Phab ntsa thickness qib, uas cov lej siab dua qhia cov phab ntsa tuab, ua rau cov yeeb nkab muaj zog ntau dua thiab ua haujlwm siab.

Siv NPS 2 "raws li piv txwv, phab ntsa thicknesses sib txawv SCH tooj yog raws li nram no (units: mm):

SCH 10: 2.77 hli
SCH 40: 3.91 hli
SCH 80: 5.54 hli

 
【Cov Lus Cim Tseem Ceeb】
- SCH tsuas yog kev xaiv, tsis yog ntsuas ncaj qha ntawm phab ntsa tuab;
- Cov kav dej uas muaj tib lub npe SCH tab sis qhov sib txawv NPS ntau qhov sib txawv ntawm phab ntsa thicknesses;
- Qhov ntsuas SCH siab dua, qhov tuab ntawm cov yeeb nkab phab ntsa thiab qhov siab dua qhov kev ntsuas siab.