Capitalizing on steel’s flexibility, high compressive strength, and consistent outside diameter tolerances, Permalok is used as both a casing pipe with an interior carrier pipe or utility lines, or as a carrier pipe for low- and no-pressure applications. Permalok excels under large jacking forces and is ideal for underwater crossings and below trains, roads, or other structures.

Permalok is ideal for urban areas. Field crews install by microtunneling, pipe jacking, pipe ramming, auger boring, or Direct Pipe®, horizontal directional drilling, and open-cut casing installations. Permalok is available in any length up to 40’ and in size up to 156” OD and 2.5” thick.

In addition to the strength, resilience, and longevity delivered with engineered steel pipe, Permalok delivers many advantages to your trenchless or microtunneling project:

• Significantly reduces installation time and field labor costs.
• Standard product is typically leak-proof, even under considerable groundwater pressures.
• Flush to OD.
• Unequaled joint precision and accuracy.
• Lining and coating options
• Fully conductive for both passive and inactive cathodic protection systems
• Can be manufactured to applicable ASTM or AWWA C200 standards.

Sources:- https://www.nwpipe.com/products/permalok-steel-casing-pipe/

Northwest Pipe Company

Northwest Pipe Company of North America is one of the largest manufacturers of steel pipe water systems. It serves many industries including energy and water market. Incorporated in 1996, the company provides the highest quality products. It uses spiral weld and rolled and welded methods to manufacture premium quality products. It has a highly experienced staff that guides the company towards excellence.