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This paper discusses a classic example where the facts surrounding the failure of a lining system were ignored and undue reliance was placed on laboratory analysis. This “blind faith” in analytical data without a sound causal theory caused the failure analysts to disregard or overlook the obvious.
Too often, coating failure analysts ignore the evidence in front of them and obsess with hi-tech analytical analysis simply because it is available to them, or perhaps because that is was they themselves are in the business of doing. This tendency to rely on hi-tech test data to find a conclusion that supports a biased point of view is the wrong way to approach failure analyses, but it can impress and even dazzle. Frequently, this overuse of analytical methods complicates logical and accurate failure analysis work. This paper discusses a classic example where the facts surrounding the failure of a lining system were ignored and undue reliance was placed on laboratory analysis. This “blind faith” in analytical data without a sound causal theory caused the failure analysts to disregard or overlook the obvious., Keywords: isocyanate, polyol, polyurethane, carbon dioxide, hydrolysis
Presence of surface rust is normally assumed to decrease the performance of coatings. In this work various maintenance coatings were applied on pre-rusted steel cleaned by two different power tools: rotating disc and rotating steel brush.
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In this paper the approach of an Oil Company is demonstrated from the initial choice between different primers: inorganic zinc and organic (epoxy) zinc., to all the preliminary pre-qualification tests, the subsequently field test performed, and the procedures adopted, costs included.
Three layer polypropylene (3LPP) pipeline coatings failed prematurely in the oilfields of Abu Dhabi in the United Arab Emirates (UAE). A failure investigation and analysis into this phenomenon was instigated. The coating disbondment has been found to be due to high residual stress concentration and adhesion loss.