API 5CT ndi muyezo pa casing mafuta ndi American Petroleum Institute, makamaka paipi yamafuta, chubu ndi casing.

API 5CT mafuta casing ntchito pobowola mafuta chitsime, amene makamaka ntchito pobowola ndi kutsiriza khoma lamanja la thandizo, kuonetsetsa kuti khalidwe ndi akamaliza kubowola ndondomeko pambuyo ntchito bwinobwino zitsime.Casing ndi kusunga zitsime zikuyenda bwino.Monga zinthu zosiyanasiyana geological, mobisa zovuta maganizo boma, kukoka, kukanikiza, kupinda, torsional maganizo kuchita pa ophatikizana zotsatira za chubu, amene casing palokha, khalidwe la zofunika apamwamba.Chosungiracho chikawonongeka pazifukwa zina, chingayambitse zitsime zonse zopangira, kapena kuchotsedwa.

Makina a API 5CT API 5CTSeamless zitsulo machubu: