Denso Bore-Wrap®

HDD exposes coatings to SAIG forces (Shear, Abrasion, Impact, Gouge). Conventional coatings alone are not designed for these stresses. This is the harshest method of pipeline installation, requiring the pipe to be dragged through a hole for some duration. Conventional coatings are designed for trenched pipe lays with select backfill getting poured over it.

SAIG stands for Shear, Abrasion, Impact, and Gouge. These are the four major forces that damage coatings during HDD installations. Bore-Wrap® is specifically engineered to protect against all four, ensuring your pipeline coating survives pullback.

Yes, the poly-wrap is not a structural component of the Bore-Wrap system.  It’s sole purpose is to compress the resin during the cure process.  If it is not removed, it will begin to tear off inside the whole and possibly create hole obstructions or points that can shield CP. When removing, small bits may get stuck in the resin, they will not impact the performance and can be left on the surface.

The primary task before applying Bore-Wrap is to ensure the surface is clean and free from oil and debris.  Use a holiday detector to verify that the anti-corrosion coating is fully intact before applying Bore-Wrap.  Bore-Wrap bonds through a combination of surface tension, hoop strength, and compressive strength.  These factors/properties are inherent in the products design and will be present regardless of the level of surface roughening done to the underlying anti-corrosion coating.  While adding some surface roughening may increase adhesion, it is not always necessary.  For specific applications contact Denso for further information.

Bore-Wrap resin hardens as it cures.  It is a single component resin that activates with water so no mixing is involved.  The fiberglass architecture does not “cure” as fiberglass is already in it’s final state.  To check the cure, use a Calibrated Shore-D gauge on the highest point of resin to make sure the resin is cured.  Sufficient cure is at a Shore-D of 65 or greater.

Bore-Wrap is a simple application and can be completed with as few as 3 people or as many as 10.  The time to apply is usually measured in feet per minute.  With 3 people doing a girthweld protection, it is about 1.5 feet per minute.  With 6 to 10 people performing a mainline application it is about 3 feet per minute regardless of the diameter.  One key element is the volume of water that is available,  you can only progress at the speed that allows for the Bore-Wrap to be saturated.

Yes. Bore-Wrap® is water-activated, VOC-free, and cures without releasing hazardous chemicals, making it safe for use near wetlands, rivers, and HCAs.

A minimum of two layers with 50% overlap is required for protection. For extreme HDD conditions or rocky soils, additional layers can be applied to increase durability.

Both. Bore-Wrap® can be applied weld joints and can also be spirally wrapped for full line encapsulation in highly abrasive bores.

Unlike liquid coatings, Bore-Wrap® is a composite laminate that resists shear, gouge, and impact forces. Epoxies may resist abrasion but are often brittle under HDD stresses, while Bore-Wrap flexes and absorbs energy. Bore-Wrap is an additional mechanical protection for anti-corrosion coatings and is not a replacement for them.

No. Bore-Wrap® is a sacrificial outerwrap and does not shield CP. Its purpose is to protect the underlying corrosion coating so that CP can function properly after installation.

FBE, 3LPE, 3LPP, liquid epoxies, shrink sleeves, and other anti-corrosion systems.

Under typical conditions, Bore-Wrap® cures in under an hour, reaching Shore D 65+ hardness. A simple Shore-D test on the resin surface can confirm cure.