Casing, tubing and drill pipe are necessary during the drilling and producing process in the oilfield. Specifications Of Tubing And Casing(Including Couplings):No.Outside diameterWall ThicknessType of end-finishGradeType of Pipeinchmminchmm12 3/860.30.1904.83NUE,EUEJ55,N80,L80,P110,N80Q,L80-1Seamless22 7/873.00.2175.51NUE,EUEJ55,N80,L80,P110,N80Q,L80-1Seamless33 1/288.90.2546.45NUE,EUEJ55,N80,L80 ...