Menene SCH (Lambar Jadawalin)?

SCH tana nufin “Tsarin Jigila,” wanda shine tsarin ƙididdigewa da ake amfani da shi a cikin Tsarin Bututun Amurka don nuna kaurin bango. Ana amfani dashi tare da diamita na ƙididdiga (NPS) don samar da daidaitattun zaɓuɓɓukan kauri na bango don bututu masu girma dabam, sauƙaƙe ƙira, masana'anta, da zaɓi.

 

SCH ba ya nuna kaurin bango kai tsaye amma tsarin ƙididdigewa ne wanda ya dace da ƙayyadaddun kaurin bango ta daidaitattun teburi (misali, ASME B36.10M, B36.19M).

 

A farkon matakan haɓaka daidaitaccen tsari, an ba da shawarar ƙimayar dabara don bayyana alaƙar da ke tsakanin SCH, matsa lamba, da ƙarfin abu:
SCH ≈ 1000 × P / S
Inda:
P - Tsarin ƙira (psi)
S - Danniya mai ƙyalli na kayan (psi)

 

Kodayake wannan dabara tana nuna alaƙar ƙirar kaurin bango da yanayin amfani, a cikin zaɓi na ainihi, madaidaicin ƙimar kaurin bango dole ne a yi la'akari da daidaitattun tebur.

 

Asalin da Ma'auni masu alaƙa na SCH (Lambar Jadawalin)

Asalin tsarin SCH Cibiyar Matsayin Ƙasa ta Amurka (ANSI) ce ta kafa kuma daga baya Ƙungiyar Injiniyan Injiniya ta Amurka (ASME) ta karbe ta, an haɗa ta cikin jerin ma'auni na B36, don nuna alaƙa tsakanin kaurin bangon bututu da diamita na bututu.

 

A halin yanzu, ƙa'idodin da aka saba amfani da su sun haɗa da:

ASME B36.10M:
Ya dace da carbon karfe da gami karfe bututu, rufe SCH 10, 20, 40, 80, 160, da dai sauransu.;

ASME B36.19M:
Ana amfani da bututun bakin karfe, gami da jerin nauyi kamar SCH 5S, 10S, 40S, da sauransu.

 

Gabatar da lambobin SCH ya warware batun rashin daidaiton kauri na bango a tsakanin diamita daban-daban, ta haka ya daidaita ƙirar bututun.

 

Yaya ake wakilta SCH (lambar jadawalin)?

A cikin ƙa'idodin Amurka, yawanci ana nuna bututun ne ta amfani da tsarin "NPS + SCH," kamar NPS 2" SCH 40, yana nuna bututun da ke da diamita na inci 2 da kaurin bango wanda ya dace da ma'aunin SCH 40.

NPS: Girman bututu mai ƙima, wanda aka auna shi cikin inci, wanda ba ainihin diamita na waje ba amma madaidaicin girman masana'antu. Misali, ainihin diamita na NPS 2" kusan milimita 60.3 ne.

SCH: Matsayin kauri na bango, inda lambobi masu girma ke nuna bango mai kauri, yana haifar da ƙarfin bututu da juriya.

Yin amfani da NPS 2" a matsayin misali, kaurin bango don lambobin SCH daban-daban sune kamar haka (raka'a: mm):

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

 
【Muhimmin Bayani】
- SCH nadi ne kawai, ba ma'aunin kaurin bango kai tsaye ba;
- Bututu tare da ƙirar SCH iri ɗaya amma nau'ikan NPS daban-daban suna da kaurin bango daban-daban;
- Mafi girman ƙimar SCH, girman bangon bututu kuma mafi girman ƙimar matsa lamba.