natural gas oil pipe,duplex pipe,seamless pipe 1.OD:33-610mm 2.WT:1.0-40mm ... billet over a piercing rod to create the hollow shell. Seamless Steel Pipe withstands pressure better than other types of pipe, which ... oil and gas transportation.Natural gas oil pipe,duplex pipe,seamless pipe 1.OD:33-610mm2.WT:1.0-40mm3.Length ... nondestructive inspection; SGS/BV natural gas oil pipe,duplex pipe,seamless pipe