Scar-Guard Enables HDD Installation Under the Oneida River

Scar-Guard Enables HDD Installation Under the Oneida River

New York

PIPE DETAIL

New, 24-inch (609.6-mm) regulated pipeline was being installed using HDD

The line was being pulled 1,200 feet (366 m) through cobble

The original ARO failed to protect the pipeline from damage

SUMMARY

  • A company installed a new, 24-inch (609.6-mm) pipeline using HDD
  • The line was being pulled 1,200 feet (366 m) through cobble
  • The original protection failed to protect the line during HDD
  • Scar-Guard replaced the ineffective coating, protecting the FBE coating during installation
  • No UV light or heating required
  • No negative impact on project schedule or budget
  • No hazards introduced to the worksite.

A natural gas utility company that was installing a new, 24-inch (609.6-mm) regulated pipeline via horizontal directional drilling (HDD) encountered a challenging bore path approximately 1,200 feet (366 m) long under the Oneida River. The pipeline, which was being placed through cobble, was contending with one of the most difficult soil conditions the contractor had ever seen.

The first run set the tone for the project. Not only was the carbide cone lost as the section of pipeline was being pushed through the cobble, but the coating was scarred down to wall loss. A site engineer assessing the damage suggested the scarring on the pipe had resulted from the cone dragging at a tangent along the line. While this seemed likely, the team could not locate the carbide cone, and drilling another hole would be cost prohibitive, amounting to approximately $1.5 million.

The installation team prepares a 300-ft (91-m) section of pipe with Scar-Guard for a test pull

It was apparent that running the pipe as originally intended would not be successful. The crew needed a better plan.

A successful test pull determined the ARO could withstand the abrasion from the cobble.

Several members of the installation team had experience with successful HDD installations using Scar-Guard®, a composite abrasion resistant overcoating (ARO) constructed of fiberglass cloth that is pre-impregnated with a durable, flexible polyurethane resin. It is activated by water and cures in a matter of minutes, creating a sacrificial outer laminate system that protects preapproved, anticorrosion field joint coatings and mainline coatings such as fusion bonded epoxy (FBE), liquid epoxies, shrink sleeves, and tapes. It is designed to protect these coatings from the mechanical stresses and scarring associated with HDD, thrust-bore, direct pipe and microtunnel pipeline installation methods.

The team decided to perform a test pull on a 300-ft (91-m) section of pipe protected with Scar-Guard to determine if the ARO could withstand the abrasion from the cobble. A successful test proved that Scar-Guard was equal to the task.

The field team wrapped the 300-ft (91-m) section of line as well as every weld with Scar-Guard to provide maximum protection during the pull, enabling the successful HDD installation with full encapsulation of the 1,200 feet (366 m) of pipe. Using Scar-Guard, the company saved the exorbitant cost of drilling a second hole and achieved a successful and reliable installation.

While the industry as a whole struggles to protect pipeline coatings installed by HDD, this utility company invested in the necessary steps to ensure the long-term integrity of the pipeline.

The field team wrapped 300 ft (91-m) of the line and every weld with Scar-Guard to provide maximum protection during the installation, enabling the successful HDD installation of the full 1,200 feet (366 m) of pipe.