... serves as wall of well.J55,K55,N80,L80,P110 oil casing pipeTubing is used in extracting petroleum & natural gas. ... For the purpose of transportation of gas,water,oill in oil&gas industry.API SPEC 5CT.Tubing is used in extracting ... is used for conveying water,petrolem,gas and other common fluids.ASTM A179 For tubed heat exchanger and similar heat conveying ... 0.35≥0.100.291.06≤0.035≤0.035 oil casing pipe