... :1,API SPCE 5L For the purpose of transportation of gas,water,oill in oil&gas industry.2, API ... 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 ... , ASTM A179 For tubed heat exchanger and similar heat conveying equipments6, ...