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Picture for Study of Minimal Surface Preparation for Various Patch Repair Coating Products Applied under the Minimum Allowable Temperatures
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Study of Minimal Surface Preparation for Various Patch Repair Coating Products Applied under the Minimum Allowable Temperatures

Product Number: 51324-21005-SG
Author: Shan (Sherry) Rao; Da Kuang; Connor McManus
Publication Date: 2024
$40.00
Patch repair coating products provide cost-effective solutions for restoring small to medium-sized damages in mainline coatings to extend the lifespan of pipelines. Some coating products are specially designed to tolerate reduced surface conditions while providing the adequate corrosion protection performance. Due to easy mobilization and relatively inexpensive, power tool cleaning is commonly used in the field to prepare surfaces for small area repairs. During field coating work, adverse weather conditions are often encountered. However, little data were publicly available to support if the minimal surface recommended by the product data sheet (PDS) is also suitable for the coating applied under the minimum allowable temperature. In addition, the effect of the similar surface level produced by different power tools on the corrosion resistance of the same coating is rarely reported. This paper aims to address these gaps. Four commercially available coating products were selected to examine their potentials as patch repairs, including one liquid-applied epoxy coating, one butyl-based sealant product, and two viscoelastic coating products. Test samples were prepared using a rust grade C steel pipe section. Different power tools such as wire brush, rotary sander, flap disc, and bristle blaster were used to create SSPC-SP3, SSPC-SP11, and SSPC-SP15 surfaces. All four products were applied and cured at the minimum allowable temperatures specified in their respective PDS or recommended by the manufacturers. A 14-day cathodic disbondment (CD) test was employed to rule out the improper surfaces or power tools, and the next higher surface level was then considered as potentially suitable. The long-term performance characteristics of these coating products on the established minimal surfaces under the minimum allowable application temperatures were evaluated using the selected critical tests from CSA Z245.30 standards.

Fundamentals of Cleaning and Coating Concrete, The

Product Number: 38363
ISBN: 1889060615
Author: Edited by Randy Nixon and Dr. Richard Drisko
$125.00