Laboratory Testing of Low Temperature Cure Liquid-Applied Coating Systems for Pipeline Maintenance

摘要

This paper describes the laboratory testing to assess the performance and curing characteristics of low temperature cure liquid-applied coating systems for pipeline maintenance. Four low temperature cure coating systems were applied to abrasively blasted steel under simulated winter field conditions. The steel substrate temperatures were maintained at 0 °C during application and curing up to the point of testing. The low temperature cured coating samples were tested in accordance with industry standards for cathodic disbondment resistance, adhesion before and after hot water immersion, impact testing and flexibility that would be representative of maintenance activities. The curing rates at low temperatures were also determined using differential scanning colorimetry (DSC). Based on the laboratory testing and curing results, it was concluded that selected coating systems were suitable for maintenance application to excavated oil and gas pipelines, when the lines are operating at temperatures as low as 0 °C.