Jerin kaurin bangon bututun ƙarfe ya fito ne daga sashin nazarin awo na Biritaniya, kuma ana amfani da maki don bayyana girman.Thekaurin bango nabututu mara nauyi ya ƙunshi jerin Jadawalin (40, 60, 80, 120) kuma an haɗa shi da jerin nauyi (STD, XS, XXS).Ana juya waɗannan dabi'u zuwa millimeters a matsayin ɓangare na jerin kauri na bangon bututu.(Lura: Girman - ƙimar Schedule40 ba ta dindindin ba ce, amma don duba diamita na waje na bututu.)

Hanyar bayyana diamita da kauri, ƙananan diamita na waje da ƙananan kauri na bututu don farfajiyar dumama, NPS don bututun bututu da adadin jadawalin bangon bututu.Jerin kauri na bango ya ƙunshi jerin 8 daga 10 zuwa 20, 30, 40, 80, 120, 140, 160. Jerin 40 shine jerin ma'auni, na 80th shine jerin kauri, 120 kuma shine ƙarin kauri.jerin.

Kaurin bangon Matsayin Amurka da na gida ya bambanta sosai.Gabaɗaya, maki biyu na matsa lamba na CL.150 da CL.300 ba su da girma.Gabaɗaya, ana amfani da SCH10S da SCH40.Kasa da 50 zaɓi SCH80 da SCH40S.

SCH40, lambar bututu, na gida ne ko na waje, ana amfani da Sch.XX don nuna kaurin bangon bututu.GB/T81631 HG20553 kuma an haɗa shi a cikin ma'auni na ƙasa GB/T81631 HG20553, da dai sauransu, bisa ga diamita na waje na bututu ko girman bututun, kaurin bango daban-daban da aka nuna ta lambar bututu iri ɗaya sun bambanta.

Hanyar bayyana kaurin bangon bututun ƙarfe mara nauyi yana da hanyoyi guda uku: girman ma'aunin bututu, girman bangon bututun ƙarfe da nauyin bututu:

1) Kaurin bango yana nuna lambar bututu "Sch".
Lambar ma'aunin bututu shine rabon matsi na ƙirar bututu zuwa damuwa da aka yarda da kayan a yanayin ƙirar ƙira da aka ninka ta 1000 da zagaye.Wato: Sch=P/[σ]t×1000
ANSI B36.10 kauri bango rating: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 goma maki;
ANSI B36.19 kaurin bango daraja: Sch5s, Sch10s, Sch40s, Sch80s maki hudu;

2) Dangane da kauri na bango na bututun ƙarfe, China, ISO, Japan, ana ɗaukar wasu ka'idodin bututun ƙarfe.

3) Kaurin bangon bututu yana bayyana da nauyin bututun, wanda ya raba kaurin bangon bututu zuwa nau'i uku:
a.Daidaitaccen bututu mai nauyi, wanda aka bayyana a cikin STD
b mai kauri, wanda aka bayyana a cikin XS
c.Karin kauri mai kauri, wanda XXS ke nunawa.
Don bututu tare da DN ≤ 250mm, Sch40 daidai yake da STD, DN <200mm bututu, Sch80 daidai yake da XS.