... ,API SPCE 5L For the purpose of transportation of gas,water,oill in oil&gas industry.2, API SPEC 5CT Tubing is used in ... & natural gas. casing pipe serves as wall of well.3, ASTM A106 For the purpose of the pipeline project of boiler,water&petroleum ... .4, ASTM A53 It is used for conveying water,petrolem,gas and other common fluids.5 ...