by Bruce J. Wiskel, P.E., Pacific Gas & Electric Company; and J. Peter Ault, P.E., Elzly Technology Corporation
The authors discuss the challenges of applying coatings to transmission pipeline when the surface temperature dips below 50 F and determine that the optimum approach for cold weather coating application on girth welds is to use the existing approved epoxy coatings with induction preheat of the pipe during surface preparation, coating application and cure.
When the length of the riser piping on an oil production platform increases for structures in deep water, vortex-induced vibrations can crack joints in the riser string or rupture the riser pipe itself, causing a potentially disastrous oil spill. The author describes a project where coatings provided a preventative solution.
The authors describe ongoing work being conducted with the Center for Corrosion Science and Engineering and the U.S. Naval Research Laboratory, with the support of the Naval Sea Systems Command, in order to understand and refine variations in surface preparation and their effect on the subsequent performance of marine coatings.