Bututun ƙarfe na ƙarfe mai kauri na Helical ASTM A139 Grade A, B, C

Kadarar Inji

Sinadarin Sinadarai

Gwajin Hydrostatic

Mai ƙera zai gwada kowace tsawon bututun zuwa matsin lamba na hydrostatic wanda zai haifar da matsin lamba na akalla kashi 60% na ƙarancin ƙarfin samar da amfanin gona da aka ƙayyade a zafin ɗaki. Za a ƙayyade matsin lambar ta hanyar lissafi mai zuwa:
P=2St/D

Bambancin da Aka Yarda a Nauyi da Girma

Kowace tsawon bututu za a auna ta daban kuma nauyinta ba zai bambanta fiye da kashi 10% sama da ko 5.5% ƙarƙashin nauyinta na ka'ida ba, ana ƙididdige ta ta amfani da tsawonta da nauyinta a kowane tsawon naúrar.
Diamita na waje ba zai bambanta fiye da ±1% daga diamita na waje da aka ƙayyade ba.
Kauri a bango a kowane lokaci bai kamata ya wuce kashi 12.5% ​​ba a ƙarƙashin kauri na bango da aka ƙayyade.

Tsawon

Tsawon bazuwar guda ɗaya: ƙafa 16 zuwa 25 (mita 4.88 zuwa 7.62)
Tsawon bazuwar sau biyu: sama da ƙafa 25 zuwa ƙafa 35 (7.62 zuwa 10.67m)
Tsawon iri ɗaya: bambancin da aka yarda da shi ±1in

Ƙarshe

Za a yi wa tukwanen bututu ado da ƙananan ƙarewa, sannan a cire ramukan da ke ƙarshensu
Idan ƙarshen bututun ya zama ƙarshen bevel, kusurwar za ta kasance digiri 30 zuwa 35