Permalok - Steel Casing Pipe

Since 1997, over 2 million feet of Permalok^® Steel Casing pipe has been installed on jobs where failure was not an option. That’s why Permalok^® stands as the product of choice for trenchless contractors and engineers for their most important and challenging projects.

Permalok^® Steel Casing Pipe from Northwest Pipe Company is installed easily using various trenchless jacking construction methods including microtunneling and pipe jacking, auger boring, pipe ramming, Direct Pipe®, and others.

• Eliminate field butt-welding, and associated down time … no more waiting 4 to 5 hours while a 60-inch casing pipe is butt-welded in the field before moving on to the next pipe section
• Save time and money, lower labor and equipment intensive processes of various pipe jacking methods
• Flush on both the ID and OD
• Reduced costs by significantly increasing productivity in the field
• Unequaled precision and accuracy provided by a joint of consistent quality and integrity
• Available in any length and size – up to 150-inch OD and 2½-inch wall thickness
• Quick and easy installation

Permalok^®‘s precision machined ends create a time-savings benefit, cutting jointing time by 90% or more from field butt welded joints. This means overall tunneling duration is significantly reduced, and periods of non-movement of the tunnel are kept to a minimum, reducing potential for ground loss at the face or ceasing the tunnel due to ground squeeze or friction. Pipe is still flush on OD and ID, so pipe jacking and stringing of carrier pipe is unaffected.

Permalok^® Fits Your Project

The system is approved for both steel casing and with modifications, pressure pipe applications. The T-5, T-7 and Type HDD joints each bring a different application- specific solution to the pipe connections. Standard specifications ensure that all pipe manufactured by Permalok^® meet stringent guidelines. Joint quality is further enhanced because the Permalok^® connector is consistently round, true and perpendicular to the pipe axis. Its unique machined groove makes stabbing and aligning easy and expeditious.

Permalok^®Steel Coatings and Linings

Permalok^® uses several options for our coatings and linings. The primary materials applied to Permalok^® products are:

Coal Tar Epoxy– A catalyzed, two-component lining that combines the corrosion-resistant characteristics of coal tar pitch with those of epoxy resin, resulting in a cured lining that will tolerate reasonable impact abrasion and flexing.

Bitumastic– Bitumastic is made from coal tars and blends of resins such as epoxy. A trade name often associated with long-term protection from water penetration, Bitumastic is an economical, heavy-duty material which protects piping subjected to water immersion.

Polyurethane– Polyurethanes are used extensively in the pipe coating industry because they exhibit excellent corrosion resistance, abrasion resistance, toughness and chemical resistance, as well as a wide range of useful mechanical properties. Fast-setting, high-solids polyurethane has been used to line and coat steel pipe for various demanding trenchless and open-cut applications.

Power Lonestar “Powercrete®”– An epoxy based polymer concrete which protects the steel pipe under severe handling conditions. It is highly abrasion-resistant, and provides a smooth surface that allows for less drag resistance than standard concrete.

Efficiency Comparison

Save Time and Money – Permalok^®’s time saving benefits are significant. Two examples of how you can save time and money in common installations are detailed below.