He tuwhera ngā pito e rua o te ngongo kōhua, ā, he wāhi tuwhera tōna. Ko te roa me te taha e karapoti ana i te maitai nui ake, e ai ki te tikanga whakaputa ka taea te wehewehe ki te paipa maitai kore hononga me te paipa maitai whakarewa. Ko ngā whakatakotoranga paipa maitai me ngā inenga whānui (pēnei i te diameter, te roa rānei) me te matotoru o te pakitara, e kī ana he whānui rawa te whānuitanga o te rahi, mai i te diameter iti ki te maha mita te diameter, he paipa diameter nui.

Ka taea te whakamahi i ngā ngongo maitai mō ngā paipa, ngā taputapu wera, te ahumahi mīhini, te tūhuratanga whenua hinu, ngā ipu, te ahumahi matū me ngā kaupapa motuhake.

(1) He maitai hanganga waro kounga teitei 20G, 20MnG, 25MnG.

(2) Te maitai hanganga koranu 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, me ētahi atu.

E rua ngā momo o te ngongo waikeri:GB/T3087-2018ngongo poihau pēhanga waenga me te pēhanga iti,GB/T5310-2018ngongo poihau pēhanga teitei. Ko ā mātou hua matua ko:

ASTMA210(A10M)-2012He paipa maitai kore-whakarewa me te wera-rahi, he mea hanga ki te kōhua ​​waro-waenga, ko te rauemi matua ko te SA210 GrA1, SA210GrC;

ASME SA106/SA-106M-2015, ko ngā rauemi matua ko GR.B gr.C;

ASME/SA SA – 213-213 – m, rauemi koranu noa: T11, T12, T22 me te T23, T91, P92, T5, T5b, T9, T21, T22, T17;

ASTM A335 / A335M – 2018, ko ngā rauemi matua ko: P11, P12, P22, P5, P9, P23, P91, P92, P2, me ētahi atu.