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Coal tar enamel was a remarkable coating that provides an extremely long service life, under the right conditions. The Bureau of Reclamation has seen coal tar enamel provide corrosion protection at Hoover Dam for over 80 years and is still providing corrosion protection. When temperatures remain constant, inside penstocks and outlet pipes that were buried or go through a dam or a tunnel, the coal tar enamel is in excellent condition with minor damage. However, coal tar enamel does have some limitations, when temperatures fluctuate from hot and cold the enamel forms alligator cracking. Coal tar enamel has failed on many of the above ground penstocks and outlet works in Reclamations infrastructure requiring complete removal and replacement with epoxy or polyurethane coatings. This presentation will cover the proper methods and procedures for spot repairing and salvaging minor damaged coal tar enamel.
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