Mndandanda wa makulidwe a chitoliro chachitsulo chimachokera ku gulu la British metrology, ndipo zotsatira zake zimagwiritsidwa ntchito kusonyeza kukula kwake.Thewall makulidwe aChitoliro chopanda msoko chimapangidwa ndi mndandanda wa Ndandanda (40, 60, 80, 120) ndipo chikugwirizana ndi mndandanda wolemera (STD, XS, XXS).Izi zimasinthidwa kukhala mamilimita ngati gawo la mndandanda wa makulidwe a chubu.(Zindikirani: Kukula - mtengo wa Schedule40 siwokhazikika, koma kuyang'ana kunja kwa chubu.)

Njira yofotokozera m'mimba mwake ndi makulidwe a chitoliro, m'mimba mwake mwadzina ndi makulidwe osachepera a chitoliro chotenthetsera, NPS ya chitoliro cha chitoliro ndi nambala ya ndandanda ya khoma la chitoliro.Mndandanda wa makulidwe a khoma uli ndi mndandanda wa 8 kuchokera ku 10 mpaka 20, 30, 40, 80, 120, 140, 160. Mndandanda wa 40 ndi mndandanda wamtundu, 80 ndi mndandanda wandiweyani, ndipo 120 ndi wowonjezera.mndandanda.

Makulidwe a khoma la American Standard ndi muyezo wapakhomo ndi wosiyana kwambiri.Nthawi zambiri, magulu awiri okakamiza a CL.150 ndi CL.300 sakhala okwera.Nthawi zambiri, SCH10S ndi SCH40 amagwiritsidwa ntchito.Osakwana 50 sankhani SCH80 ndi SCH40S.

SCH40, nambala ya chubu, kaya ndi yapakhomo kapena yakunja, Sch.XX imagwiritsidwa ntchito kusonyeza makulidwe a khoma la chitoliro.GB/T81631 HG20553 imaphatikizidwanso mu standard standard GB/T81631 HG20553, etc., malinga ndi m'mimba mwake akunja kwa chitoliro kapena kukula kwa chitoliro, makulidwe a khoma la makulidwe osiyanasiyana omwe amawonetsedwa ndi nambala yofanana ya chitoliro ndizosiyana.

Njira yofotokozera makulidwe a khoma la chitoliro chopanda chitsulo ili ndi njira zitatu: kukula kwa chitoliro, kukula kwa chitoliro cha khoma ndi kulemera kwa chitoliro:

1) Makulidwe a khoma akuwonetsedwa ndi nambala ya chitoliro "Sch".
Nambala ya chitoliro cha chitoliro ndi chiŵerengero cha chitoliro cha mapangidwe a chitoliro ku kupanikizika kovomerezeka kwa zinthu pa kutentha kwapangidwe kochulukitsidwa ndi 1000 ndikuzungulira.Dzina lake: Sch=P/[σ]t×1000
ANSI B36.10 khoma makulidwe mlingo: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 khumi giredi;
ANSI B36.19 khoma makulidwe kalasi: Sch5s, Sch10s, Sch40s, Sch80s magiredi anayi;

2) Malinga ndi makulidwe a khoma la chitoliro chachitsulo, China, ISO, Japan, miyezo ina yachitsulo imatengedwa.

3) Makulidwe a khoma la chitoliro amawonetsedwa ndi kulemera kwa chitoliro, chomwe chimagawa makulidwe a khoma la chitoliro m'mitundu itatu:
a.Standard weight chubu, yofotokozedwa mu STD
b wokhuthala chubu, wofotokozedwa mu XS
c.Chubu chokulirapo chowonjezera, chojambulidwa ndi XXS.
Kwa mapaipi okhala ndi DN ≤ 250mm, Sch40 ndi ofanana ndi STD, DN <200mm chitoliro, Sch80 ndi ofanana ndi XS.