... standard:ASTMA50,ASTMA53,JISG3475,JISG3444 2) application: struciton,low-pressure fluid 3) type:welded helical welded pipe 1)standard ... :ASTMA50,ASTMA53,JISG3475,JISG3444 2) application: struciton,low-pressure fluid 3) type:welded helical welded pipe1standard:ASTMA50,ASTMA53 ... ,ISO93303,ISO93304,ISO93305,ISO933062) application: struciton,low-pressure fluid 3) type: welded helical welded pipe