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Homestake Suction Pipeline Replacement

Rehabilitation

Using a sliplining application, steel pipe replaces sections of an aging concrete water system through the rough terrain of the Continental Divide.

Engineered Steel Water Pipe

Kearney Lake Road Slipline

Rehabilitation

An Innovative joint proves successful in critical sprialweld steel pipe slipline project to rehabilitate a deteriorating PCCP water main. The result is a structurally independent system with a 100-year service life.

Engineered Steel Water Pipe

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 Electrical Cooperative Wildcat Intake

Trenchless

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

Weaverville California State Route 3 Culvert Rehabilitation

Trenchless

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

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

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