... , 2. IPS-M-PI-190(2), 3. NACE MR-0175. Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe 323Design and manufacture many kinds ... technology Large Diameter, Thick Wall Steel Pipes and Tubes, ERW/LSAW welded carbon steel pipes and tubes, length less than 14 meters, thickness less than ... , GB/T9711.1-1997, GB/T13793-92,GB/T6728-2002. Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe