... :1,API SPCE 5L For the purpose of transportation of gas,water,oill in oil&gas industry.2, API ... 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 ... ,economizer,reheater,superheater and steam pipeline of boilers.