Project Archive

metro water district lower feeder crane

Metropolitan Water District of Southern California Second Lower Feeder PCCP Rehabilitation Reach 2

Rehabilitation

To remedy distressed pipeline, Northwest Pipe manufactures steel pipe for system rehabilitation. Using the reliner method, the Metropolitan Water District of Southern California is repairing a critical water line. This cost effective, minimally invasive method eliminates water loss without the need to excavate or install a completely new pipeline system.

Engineered Steel Water Pipe
old dominion aerial view hole

Old Dominion Electrical Cooperative Wildcat Intake

Trenchless Technology

To counter act the natural buoyancy of steel, we upsized our Permalok steel casing pipe and installed internal cast iron ingots to provide sufficient weight. This new approach proved successful in this underwater intake and conveyance pipeline.

Permalok Steel Casing Pipe
welder in workshop welding

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 sunrise over 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 el Paso- water spraying from bridge

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 airport meta structure

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

We are near you!

Northwest Pipe locations across the nation.

Learn More