Contract Resources Industrial Coatings were asked by Caltex Refinery Lytton to provide a solution to upgrading the external painted surfaces of Tank 2013 as part of the statutory inspection process.
Corrosion was minimal in relation to the overall surface area (50 metres diameter, 18 metres high) however, some of the underlying coatings contained chromates. Total removal would have necessitated scaffolding the entire shell, installing containment, and using dust collection during the abrasive blasting process.
Contract Resources discussed various options with leading coating manufacturers as to suggested specifications that would be cost effective while still providing long term surface protection. Carboline proposed a 100% volume solids sealer, followed by an epoxy tie coat and a polyurethane finish as an overcoat option.
We then carried out a trial application of this system followed by a “pull off” test a week later to ensure adequate adhesion over the existing coatings. This was a success and CR was awarded the project.
Surface preparation consisted of high pressure water blasting and wet abrasive blasting of corroded areas prior to application of the new coating system. Access to all shell areas was from 3 elevating work platforms. On completion of the coating application CR painters applied the tank identification numbers.
The full article and others can be found in the Catalyst magazine, issue 16 - January 2013.