Northwest Pipe Company

Northwest Pipe Company manufactures welded steel pipe for a variety of applications. Our spiral weld pipe is manufactured in sizes 12" through 156"OD and wall thickness of 0.105" through 0.875". Spiral weld pipe is manufactured from steel coils formed helically into cylinders. The cylinders are welded as they are formed, using the double-submerged arc weld process. This process achieves 100% penetration welds and forms a flawless seam that becomes an integral part of the pipe. We manufacture pipe in lengths up to 130 feet. Pipe is then subject to comprehensive testing and inspections.

Northwest Pipe produces bar-wrapped concrete cylinder pipe at our Adelanto, CA facility. Diameters from 12 to 60 inches and design pressures up to 400 psi are produced. We manufacture in lengths up to 40 feet. Bar-wrapped concrete cylinder pipe is manufactured using a welded steel cylinder with sized steel joint rings attached. A lining of cement mortar is centrifugally applied. A continuous steel bar is helically wound tightly around the outside of the cylinder and securely welded to the steel joint rings. A coating of dense mortar is applied to the cylinder and bar wrap.

NWP also offers custom plate rolling and welding through 3" thickness at our Adelanto facility, 11/4" in Saginaw, TX and 1" in Denver, CO. These unique capabilities allow us to provide custom fabrication of heavy wall pipe for special applications beyond the range of our spiral mills.

With seven production facilities located across the United States and Mexico, we can provide prompt delivery to even the most remote job sites. Our products are noted for high quality and competitive prices. 100% radioscopic and ultrasonic inspection capabilities are available. We also offer complete fabrication and coating systems. Please call or email us to discuss your requirements.