United Spiral Pipe, LLC produces large diameter DSAW custom steel pipes primarily for the North American oil and gas industry. Its production operations include forming/tack welding/cutting, inner/outer welding, hydrostatic testing, off-line/on-line ultrasonic tests, X-ray testing, coating, marking, and testing. The company was founded in 2007 and is based in Pittsburg, California. Aerial image (shot from a plane at sunset).