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51317--9602-Fitness for Purpose of Low Temperature Cure Liquid-Applied Coating Systems for Pipeline Maintenance

Fitness for purpose of low temperature cure liquid-applied coating systems for pipeline maintenance and repair. 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.

 

Product Number: 51317--9602-SG
ISBN: 9602 2017 CP
Author: Haralampos Tsaprailis
Publication Date: 2017
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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 CSA Z662 was published. Similar to ISO 28109-3 the CSA Z245.30-14 outlines the testing criteria that liquid and fusion bonded epoxy coatings shall satisfy (Table 1 in CSA Z245.30-14).Pipeline maintenance and repair work can occurduring the winter season in certain northern regions in Canada due to the geographical restrictions placed by the local soil condition (r.g. permafrost). Subsequently low temperature cure liquid epoxy coating systems are often used to reduce the cost associated with hording the excavation site. These coating systems allow advertised curing down to as low as -20 degrees Celcius. Unfortunately mainly of the low temperature cure epoxy systems do not comply with the CSA Z245.30-14 standard.This paper will discuss the fitness for purpose of the low temperature cure epoxy coating systems for pipeline maintenance and repair on existing pipelines. A revised Table 1 will be presented along with commentary related to the deviations from the Standard.

Key words: coating, liquid-applied, epoxy, polyurethanes, vinyl esters, maintenance, low temperature cure

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 CSA Z662 was published. Similar to ISO 28109-3 the CSA Z245.30-14 outlines the testing criteria that liquid and fusion bonded epoxy coatings shall satisfy (Table 1 in CSA Z245.30-14).Pipeline maintenance and repair work can occurduring the winter season in certain northern regions in Canada due to the geographical restrictions placed by the local soil condition (r.g. permafrost). Subsequently low temperature cure liquid epoxy coating systems are often used to reduce the cost associated with hording the excavation site. These coating systems allow advertised curing down to as low as -20 degrees Celcius. Unfortunately mainly of the low temperature cure epoxy systems do not comply with the CSA Z245.30-14 standard.This paper will discuss the fitness for purpose of the low temperature cure epoxy coating systems for pipeline maintenance and repair on existing pipelines. A revised Table 1 will be presented along with commentary related to the deviations from the Standard.

Key words: coating, liquid-applied, epoxy, polyurethanes, vinyl esters, maintenance, low temperature cure

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