the casing pipe follow the API SPEC 5CT standard,used for sealing & seclude stratum and reinforce the side well. specification:size(O.D): 76-820mmwall thickness: 3-16mmmaterial:J55,K55,N80,P110,C95(LTC)(BTC)(STC),PSLcertificate:API SPEC 5CTscope of application: mainly used in the transportation of gas,water,oil and natural gas industry. casing pipe