-iso 3183 linepipe(including x120)管道输送系统用钢管2 -iso 13623pipelines长输管道系统 -iso 13847pipeline welding管道焊接 -iso 14313pipeline valves管道阀门 -iso 14723subsea pipeline valves海底管道阀门 -iso 15889cathodic protection阴极保护 -iso 15590induction bends,fittings and flanges弯管、管件和阀门 -iso 21329mechanical connectors机械连接件 以上不知道对你有帮助不?