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.
Evaluation of subsea wet thermal insulation coating materials via exposure to seawater for a 12-month period at high temperatures and high pressures is presented in ISO(1) 12736:2014. How to interpret and apply the results of this testing to the design and qualification of subsea wet insulation systems is presented.