Commodity name Octg tubing and casing pipe manufacturers Standard Api spec 5ct, api spec 5b Grade/material J55, k55, n80, l80, c90, t95, p110 and q125 Technology Plain pipe-end upsetting- austenite treatment-quenching-tempering-straightening-(non-destructive testing)- threading-thread inspection-coupling mpi-phosphating-coupling make up-drifting-hydrostatic testing-measuring&weight-marking&stenciling-coating-packing casing and tubing-transportation T&c Stc, ltc, btc, xc and premium connection Size range Tubing Od: february 3 / 8'-4 1/2 '(60.3mm - 114.3mm) Wt: 4.24mm- 16mm Casing Od: 4 1/2 "-20" (114.3mm-508mm) Wt:0.205"-0.635" (5.12mm-16.13mm) Length Tubing R1 (6.10m-7.32m), r2 (8.53m-9.75m), r3 (11.58m-12.80m) Casing R1 (4.88m-7.62m), r2 (7.62m-10.36m), r3 (10.36m-14.63m) Testing Ndt etc related rules of api 5ct and 5b Packing By bundles, seaworthy packing Application Casing pipe is widely used for fastening oil and gas well wall or borehold, with bigger diameter than tubing, including surface casings, technical casings and oil layer casings.