SCH na nufin "Jadawali," wanda tsarin lambobi ne da ake amfani da shi a Tsarin Bututun Amurka na yau da kullun don nuna kauri bango. Ana amfani da shi tare da diamita mai suna (NPS) don samar da zaɓuɓɓukan kauri bango na yau da kullun don bututu masu girma dabam-dabam, yana sauƙaƙa ƙira, kerawa, da zaɓi.
SCH ba ya nuna kauri bango kai tsaye ba amma tsarin tantancewa ne wanda ya dace da takamaiman kauri bango ta hanyar tebura masu daidaito (misali, ASME B36.10M, B36.19M).
A farkon matakan ci gaba na yau da kullun, an gabatar da wata dabara mai kimanin don bayyana alaƙar da ke tsakanin SCH, matsin lamba, da ƙarfin abu:
SCH ≈ 1000 × P / S
Ina:
P - Matsi na ƙira (psi)
S - Matsi mai izini na kayan (psi)
Duk da cewa wannan dabarar tana nuna alaƙar da ke tsakanin ƙirar kauri bango da yanayin amfani, a cikin ainihin zaɓi, dole ne a yi nuni da ƙimar kauri bango mai dacewa daga tebura na yau da kullun.
Asali da Ma'aunin SCH Masu Alaƙa (Lambar Jadawali)
Cibiyar Matsayin Ƙasa ta Amurka (ANSI) ce ta fara kafa tsarin SCH kuma daga baya ƙungiyar injiniyoyin injiniyoyi ta Amurka (ASME) ta amince da shi, wanda aka haɗa a cikin jerin ma'auni na B36, don nuna alaƙar da ke tsakanin kauri bangon bututu da diamita na bututu.
A halin yanzu, ƙa'idodin da aka saba amfani da su sun haɗa da:
ASME B36.10M:
Ana amfani da shi ga bututun ƙarfe na carbon da ƙarfe mai ƙarfe, wanda ke rufe SCH 10, 20, 40, 80, 160, da sauransu.
ASME B36.19M:
Ana amfani da bututun ƙarfe na bakin ƙarfe, gami da jerin masu sauƙi kamar SCH 5S, 10S, 40S, da sauransu.
Gabatar da lambobin SCH ya warware matsalar rashin daidaiton wakilcin kauri na bango a fadin diamita daban-daban, ta haka ne aka daidaita tsarin bututun.
Ta yaya ake wakiltar SCH (lambar jadawalin)?
A cikin ƙa'idodin Amurka, yawanci ana nuna bututun mai ta amfani da tsarin "NPS + SCH," kamar NPS 2" SCH 40, wanda ke nuna bututun mai diamita na inci 2 da kauri bango wanda ya dace da ƙa'idar SCH 40.
NPS: Girman bututun da aka ƙayyade, wanda aka auna da inci, wanda ba ainihin diamita na waje ba ne amma ma'aunin girma na masana'antu. Misali, ainihin diamita na waje na NPS 2" yana da kimanin milimita 60.3.
SCH: Matsayin kauri bango, inda lambobi masu yawa ke nuna kauri bango, wanda ke haifar da ƙarin ƙarfin bututu da juriya ga matsin lamba.
Ta amfani da NPS 2" a matsayin misali, kauri na bango don lambobin SCH daban-daban kamar haka (raka'a: mm):
SCH 10: 2.77 mm
SCH 40: 3.91 mm
SCH 80: 5.54 mm
【Bayani Mai Muhimmanci】
- SCH kawai alama ce, ba aunawa kai tsaye na kauri bango ba;
— Bututun da ke da nau'in SCH iri ɗaya amma girman NPS daban-daban yana da kauri daban-daban na bango;
— Girman ƙimar SCH, haka kauri bangon bututun yake, kuma girman matsin lamba da ya dace.
Lokacin Saƙo: Yuni-27-2025
