Project Archive

Weaverville California State Route 3 Culvert Rehabilitation

Trenchless Technology

The project’s mountainous terrain provided a great environment to introduce our new Permalok® Auger Bore Joint, which requires less jacking force for full joint engagement.

Permalok Steel Casing Pipe

Gilboa Dam Schoharie Reservoir Low Level Outlet

Trenchless Technology

Northwest Pipe manufactured multiple sizes of Permalok including 108” Internal diameter, which is the largest use of Permalok® as a carrier pipe manufactured to date, for this project which supports one of the major reservoirs supplying New York City with a potable water.

Permalok Steel Casing Pipe

I-10 Utility Bridge 24” Waterline Replacement in El Paso

Infrastructure

This expedited project included both Northwest Pipe steel water transmission pipe and Permalok steel casing pipe.

Engineered Steel Water Pipe

Philadelphia International Airport Runway 27L Extension

Infrastructure

Its strength to withstand the weight of a loaded plane landing and joints that sufficiently withstand any exposure to jet fuel and other petroleum-based fuel products, make Permalok steel casing pipe an ideal material for this microtunneling project at a busy airport.

Permalok Steel Casing Pipe

Racine Water Transmission Expansion

Water Transmission

Northwest Pipe teamed with a water agency and engineering firm that had no previous steel pipe experience to demonstrate steel pipe capabilities to successfully supply pipe for multiple phases of this water transmission project.

Engineered Steel Water Pipe

Denver Water Conduit 12 Relocation

Water Transmission

As a testament to the longevity of steel pipe, this project replaced a section of pipe from a waterline originally installed in the 1920s. The replacement was due to a waterline reroute—not from wear.