Tho yeeb nkab yog cov yeeb nkab steel nrog cov xov kab ntawv txuas rau qhov drilling rig cov khoom siv cov nplaim dej thiab sib tsoo}}} lub qhov ua ke hauv qab ntawm lub qhov dej. Tho dej thauj cov av nkos mus rau laum me ntsis thiab, nrog rau cov laum me ntsis, nce, txo qis, lossis rot}} kev sib dhos. Drill pipe must withstand significant internal and external pressure, twisting, bending, and vibration. Laum cov yeeb nkab tuaj yeem siv ntau zaus thaum lub sijhawm roj thiab roj tawm thiab ua kom zoo.
Tho yeeb nkab yog tsim los ntawm cov yeeb nkab liab thiab cov kav hlau raw los ntawm ntau cov kauj ruam. Ua ntej, sab nraud ntawm cov yeeb nkab liab qab yog khoov hauv sab hauv, thickening cov yeeb nkab phab ntsa. Tom ntej no, nws yog threaded thiab plated nrog tooj liab rau lub zog. Tsis -}}} Kev Tiv Thaiv Zoo Tswj yog tom qab ntawd ua, ua raws li vuam ntawm cov yeeb nkab lub cev pob qij txha pob qij txha. Cov yeeb nkab lub cev ces nyob rau hauv weld kev kho cua sov thiab kev kho mob kawg ntawm kev tshem tawm weld ntxhov siab. Kev sim ntxiv, suav nrog kev sim hardness, siab sim, thiab tsis yog}}}}}}}} Kev sim ua tiav cov yeeb nkab laum ua ntej nws pleev xim thiab ntim. Qhov ntev ntawm lub laum pas nrig feem ntau ib puag ncig cuaj meters.
