Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe 1. API 5L PSL1/2, 2. IPS-M-PI-190( ... as seamless carbon steel pipe and tube, JCOE technology Large Diameter, Thick Wall Steel Pipes and Tubes, ERW/LSAW welded carbon steel pipes ... /T6728-2002. Large Diameter Thick Wall PSL2 ERW Welded Steel Pipe