Method for Qualification of Coatings Applied to Wet Surfaces
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Method for Qualification of Coatings Applied to Wet Surfaces

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    • Alternative Title:
      Energy Report: Method for Qualification of Coatings Applied to Wet Surfaces
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    • Abstract:
      The field application of a pipeline repair or rehabilitation coating usually cannot wait until ambient conditions become optimal. In a humid environment, water can condense on the pipe surface because the pipe surface is usually cooler than the ambient air. For buried pipelines, the surface temperature is typically 40-60o F, which easily facilitates condensation on the pipe surface. In such situations, although the surfaces are not perfect for coating application, they have to be coated due to the need to backfill the excavation the site and rebury the pipe. To meet the requirements of applying coatings on wet surfaces, several coating manufacturers are producing “wet surface tolerant” products. The wet surface tolerance claim is based on the coating’s ability to displace small amounts of water on the surface during application. This does not address the fundamental problem that the coating must be able to cure, adhere, and maintain integrity when applied to a non-ideal substrate. Evaluation of suitable products by end-users is extremely difficult because it requires complete control of the steel surface during application and cure. The objectives of this work, therefore, were first to develop a testing rig that can simulate the conditions encountered in the field when conducting coating repairs. Coatings were then applied to pipe spool pieces in this testing rig for performance evaluation both in the lab and in the field. Secondly, a methodology was developed to screen and evaluate coating candidates for a specific application. Through this development process, critical parameters that can be used to evaluate the coating performance were identified.
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