Iyo simbi pombi madziro makubvu akateedzana anobva kuBritish metrology unit, uye chibodzwa chinoshandiswa kuratidza saizi.Thewall kukobvu kwepombi isina musono inogadzirwa neiyo Schedule series (40, 60, 80, 120) uye yakabatana kune huremu mutsara (STD, XS, XXS).Aya maitiro anoshandurwa kuita mamirimita sechikamu chechubhu madziro ukobvu akateedzana.(Cherechedza: Kukura - kukosha kweSchedule40 hakusi nguva dzose, asi kutarisa dhayamita yekunze yechubhu.)

Iyo nzira yekuratidza dhayamita yepombi uye ukobvu, zita rekunze dhayamita uye hushoma ukobvu hwepombi yenzvimbo yekudziya, NPS yepombi pombi uye nhamba yehurongwa hwemadziro epombi.The wall thickness series ine 8 series kubva pa10 kusvika pa20, 30, 40, 80, 120, 140, 160. The 40 series ndiyo standard series, ye80 ndiyo gobvu dzakatevedzana, uye 120 ndiyo yakawedzera gobvu.series.

Ukobvu hwemadziro eAmerican Standard uye chiyero chepamba chakasiyana.Kazhinji, magiredhi maviri ekumanikidza eCL.150 uye CL.300 haana kukwirira.Kazhinji, SCH10S uye SCH40 inoshandiswa.Asingasviki makumi mashanu sarudza SCH80 uye SCH40S.

SCH40, nhamba yechubhu, ingave yepamba kana yekunze, Sch.XX inoshandiswa kuratidza kukora kwemadziro epombi.GB/T81631 HG20553 inosanganisirwawo muyero yenyika GB/T81631 HG20553, zvichingodaro, zvichienderana nekunze kwedhayamita yepombi kana saizi yepombi, ukobvu hwemadziro ehukuru hwakasiyana hunoratidzwa nenhamba imwechete yepombi dzakasiyana.

Iyo nzira yekuratidza kukora kwemadziro esimbi isina musono pombi ine nzira nhatu: pombi geji saizi, simbi pombi madziro ukobvu dimension uye huremu hwepombi:

1) Ukobvu hwemadziro hunoratidzwa nenhamba yepombi "Sch".
Iyo pombi geji yenhamba ndiyo chiyero chepombi dhizaini yekumanikidza kune inotenderwa kushushikana kwezvinhu pane tembiricha yekugadzira yakapetwa ne1000 uye yakatenderedzwa.Zvinonzi: Sch=P/[σ]t×1000
ANSI B36.10 rusvingo ukobvu Rating: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 gumi mamakisi;
ANSI B36.19 rusvingo ukobvu giredhi: Sch5s, Sch10s, Sch40s, Sch80s mana mamakisi;

2) Zvinoenderana nemadziro ukobvu hwesimbi pombi, China, ISO, Japan, mamwe simbi pombi zviyero zvinogamuchirwa.

3) Ukobvu hwemadziro epombi hunoratidzwa nehuremu hwepombi, iyo inokamura madziro epombi mumhando nhatu:
a.Yakajairwa uremu chubhu, inoratidzwa mu STD
b yakakora chubhu, inoratidzwa muXS
c.Yakawedzera gobvu chubhu, inoratidzwa neXXS.
Pamapombi ane DN ≤ 250mm, Sch40 yakaenzana neSTD, DN <200mm pombi, Sch80 yakaenzana neXS.