In Canada, CSA Z245.30-14 covers the application of shop and field applied external coating systems for below ground steel pipelines. CSA Z245.30-14 was enacted in 2015 when the latest version of CSA Z662 was published. Similar to ISO 28109-3, the CSA Z245.30-14 outlines the testing criteria that liquid applied epoxy and fusion bonded epoxy coatings shall satisfy (Table 1 in CSA Z245.30-14).

Pipeline maintenance and repair work can occur during the winter season in certain northern regions in Canada due to the geographical restrictions placed by the local soil condition (e.g., permafrost). Additional, pipelines transporting compressed or liquid natural gas commodities also have operation temperatures below 10 °C. Subsequently, low temperature cure liquid epoxy coating systems are often used to allow for curing on an operating (i.e., flowing) line. These coating systems allow advertised curing down to as low as -20 degrees Celsius. Many low temperature cure liquid-applied coating products do not comply with the CSA Z245.30-14 standard when tested at the Manufacturer’s advertised maximum rated service temperatures.

This paper will discuss the fitness for purpose of low temperature cure liquid-applied coating systems for pipeline maintenance and repair on existing pipelines. Potential revisions to incorporate low temperature cure liquid-applied coating products into Table 1 of CSA Z245.30-14 will be presented along with commentary related to the deviations from the standard.

Subject
Liquid epoxies, Coating repair, Test methods, Liquid coatings, Vinyl ester, Pipelines, Liquids, Polyurethanes, Epoxy coatings, Polyurethane coatings, Coating defects, Maintenance, Coating systems
Keywords:
coating, liquid-applied, epoxy, polyurethanes, vinyl esters, maintenance, low temperature cure
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2017
Association for Materials Protection and Performance (AMPP)
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