... 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,JISG3475,JISG3444,JISG3445,JISG3441,DIN17455,DIN17123 ... ,ISO933062) application: struciton,low-pressure fluid 3) type: welded helical welded pipe