This paper begins with a brief discussion of essential properties of all pipeline coatings, and a listing of multi-layer systems designed to meet specific needs. It then focuses on special considerations regarding application parameters for multi-layer systems that use fusionbonded epoxy as the primer.
Three layer polypropylene (3LPP) pipeline coatings failed prematurely in the oilfields of Abu Dhabi in the United Arab Emirates (UAE). A failure investigation and analysis into this phenomenon was instigated. The coating disbondment has been found to be due to high residual stress concentration and adhesion loss.
Damage to coatings leads to higher potential corrosion sites on the metallic surface and could ultimately lead to a decrease in service life. This paper will present a novel coating system that incorporates both damage resistance and flexibility in a system that is not subject to cathodic shielding.