The Northwest Pipe Company manufactures and markets large-diameter, high-pressure steel pipeline systems for use in water infrastructure applications, primarily related to drinking water systems. Its pipeline systems are also used for hydroelectric power systems, wastewater systems, and other applications. The company also manufactures and markets smaller diameter, electric resistance welded steel pipe for use in a range of applications, including construction, agricultural, industrial, energy, and traffic signpost systems. In addition, Northwest Pipe Company manufactures and markets propane tanks, as well as a range of other fabricated metal products and water transmission fitting work. Propane tanks are used for home heating, agricultural, and light industrial applications, and other fabricated metal products, such as air receivers, custom pressure vessels, and components for other original equipment manufacturers targeted to the transportation, energy, and water industries. The company sells its products directly and through independent agents in North America. Northwest Pipe Company was founded in 1966 and is based in Vancouver, Washington.