... same,and the purpose is very close. In the oil drilling,K55 API 5CT casing or tubing is a relatively common ... . 1.Specifications China alibaba API 5CT K55 steel water well casing pipe and tubing 1).OD:114.3mm-508mm; 2). ... ,BV 8).Usage:oil pipeline,oil natural gas,industrial gas,water transportation; 9).Flexible payment with L/C,D/A,D ...