Engineered Steel Pipe
Leading Provider of Engineered Pipe
NWPX’s arm of water transmission pipe, Northwest Pipe Company, is the nation’s leading provider of engineered transmission pipe. Northwest Pipe Company has been setting the standard for excellence in engineering and manufacturing performance expectations since 1966.
Our commitment to on-time delivery and project performance is backed by our dedication to continuous improvement and multi-state facilities with ISO 9001:2015 certifications. With the most experienced and knowledgeable industry personnel, we provide excellent client service and competitive pricing through operational efficiencies and large buying power.
We base our national prominence on quality, service, and manufacturing to meet performance expectations in all categories including highly corrosive environments. With a regional sales staff who understand local conditions and regulations, we provide support and prompt delivery to even the most remote job sites.
Engineered Water Transmission Pipe
Northwest Pipe Company is the most experienced manufacturer of engineered water transmission systems in North America. Bar none. We custom manufacture each system to maximize project goals and specifications. For us, there is no one-size fits-all mentality.
With the ability to produce spiral or straight-seam steel pipe and bar-wrapped concrete pipe in all lengths and diameters, we offer the most comprehensive solutions for water transmission projects used in high- to low-pressure applications. We continually refine our water transmission solutions by actively working with regional water authorities, municipalities, provincial and federal agencies, industrial clients as well as their consulting engineers, AWWA, ASTM, NACE, SSPC and other standards agencies or associations.
Whether transporting water for miles or carrying liquids through pipelines at high pressure, our steel water pipe is made to last. It is durable, lightweight, quick to install, and provides exceptional value and low cost of ownership.
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Geohazard Resistant Steel Pipe
In areas prone to geohazard conditions, such as differential settlement or high seismic activity, resilient water infrastructure is paramount to ensuring a reliable supply of clean and safe water for communities and first responders. The InfraShield® Joint System by Northwest Pipe Company is a patented Geohazard Resistant Steel Pipe (GRSP) solution designed to effectively strengthen the resilience of steel pipelines and keep water flowing in these vulnerable geological areas. Manufactured in the USA and backed by rigorous testing, InfraShield® is a fully welded, easy-to-install system that offers reliably leak-free performance and significant cost savings.
The InfraShield® Joint System technology builds on the proven performance of C200 steel pipe with a standard bell and spigot lap welded joint to provide even greater resilience in geohazard zones. From an installer’s perspective, InfraShield® installs no differently than C200 pipe with a bell and spigot lap weld joint. It requires no specialized training, tools, or supervision. This means quick installation with no additional costs or risks.
InfraShield’s innovative, patented joint design eliminates the need for gaskets, providing a fully welded, leak-proof system that ensures uninterrupted water delivery to critical infrastructure and communities. Its resilient construction maintains watertight integrity and can withstand multiple shocks and after events, and unlike PVC or HPDE pipe, repair locations are easy to identify. The system can be used in conjunction with other pipeline, and design teams may opt to spec InfraShield® only in potential differential settlement, landslide, liquefaction, or geohazard zones.
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Trenchless Pipe
As a generic term for construction, rehabilitation, or replacement of buried pipelines and utilities via minimally intrusive means, trenchless technology projects produce substantially less surface and subsurface disruption compared to open trench construction. Utilized not just in urban centers where pipe laying is impractical, trenchless technology is also necessary to work around fixed structures or geographical impediments. These challenging conditions require durable pipe materials, and the compressive and tensile strength of steel is ideal for withstanding the high jacking forces often demanded in trenchless projects.
Our Permalok® steel casing pipe dramatically increases throughput and efficiency for any trenchless installation method, with patented press-fit joint technology designed specifically for Horizontal Directional Drilling (HDD) and Direct Pipe to Auger Boring, Pipe Ramming, and Microtunneling applications. Permalok’s proprietary interlocking joint system eliminates field butt-welding, resulting in quicker pipe changeovers and major cost savings.
Permalok® is leading the field in innovation with the new, patent-pending Radial Bending Joint (RBJ), which enables steel pipe to be installed along a curved radius in microtunneling applications. This ground-breaking advancement in trenchless construction represents a first in the industry.
NWPX also manufactures trenchless RCP and corrosion-resistant Lined Concrete Jacking Pipe. Both provide a robust, rigid structure capable of meeting high load demands in microtunneling applications. Our trenchless precast pipe can be jacked directly and is adaptable for use as casing or carrier pipe.
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Pipeline Rehabilitation
With many large-diameter water transmission pipelines reaching the end of their intended service lives or needing repair, municipal agencies throughout North America are embracing steel cylinder-based rehabilitation solutions.
NWPX supports municipalities grappling with water or wastewater pipeline concerns or failures. Northwest Pipe Company manufactures steel rehabilitation systems for concrete pressure or iron pipe systems and offers two independent rehabilitation solutions: Sliplining and Relining. Both provide long-term (100+ year) internal burst strength, when tested independently from the host pipe, and deliver equal to or greater than the maximum allowable operating pressure of the host pipe. In other words, rehabilitation results in a ‘brand new’ steel pipeline installed in a less invasive trenchless application.