One (1) Percenters – Allowable Bare Areas (ABAs) - Horizontal Directional Drilling (HDD)

Paper ID: C2025-00013 ABSTRACT: Since HDD has gained popularity over the last few decades, regulatory, and industry requirements have not changed to the extent that has reduced the current requirements to prevent coating damage (less than 1 percent) and provide adequate external corrosion protection for the life of the HDD crossing. With all the benefits of HDD there are disadvantages from no pipeline maintenance, difficult corrosion control, and integrity management. HDD installation increases the likelihood of coating damage during the pull back process of the carrier pipeline. This includes operational stresses and coating rock damage especially when the current requirements increase significantly compared to the line pipe. This also occurs when spiral pipe is used and more importantly the type or types of coatings used especially at the joints and tie-ins. This paper will discuss HDD installations with inadequate coating design and installations with damaged coating that may result in future integrity issues.