Report

L51467A On-Site Assessment of Mill-Applied Fusion-Bonded Coating Quality

Abstract

This report is an addendum to L51467.

The commercial application of rapid cure fusion bonded epoxy (FBE) coatings to line pipe is a fast operation. Accordingly, it is possible to coat a large number of pipe joints improperly before the inferior coating quality can be detected and the cause remedied. The quality control techniques currently used in coating plants are too slow to meet the demands of this coating and its application procedures.

The primary goal of this program was to develop on-site, repeatable, accurate, and operatively simple test procedures that are capable of determining (a) the degree of reaction (cure) of the applied FBE coating, (b) the adhesive bond strength of the coating to the steel pipe substrate, and (c) the void content of the coating created by bubble entrapment or gas formation during application. The secondary goal was to develop on-site test methods to monitor coating quality continuously and nondestructively on the coating production line.

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