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Coal Tar Enamel Service Life Extension

Coal tar enamel provides an extremely long service life, under the right conditions. The Bureau of Reclamation (Reclamation) has observed more than 80 years of corrosion protection at facilities such as Hoover Dam. The coal tar enamel linings in penstocks and outlet works that are buried, encased, or in tunnels maintain excellent condition with minor damage. However, when temperature fluctuates between hot and cold, the enamel is stressed and develops alligator cracking. 

Product Number: 41215-931-SG
Author: Allen Skaja, Bobbi Jo Merten, David Tordonato
Publication Date: 2015
$0.00
$20.00
$20.00

Coal tar enamel provides an extremely long service life, under the right conditions. The Bureau of Reclamation (Reclamation) has observed more than 80 years of corrosion protection at facilities such as Hoover Dam. The coal tar enamel linings in penstocks and outlet works that are buried, encased, or in tunnels maintain excellent condition with minor damage. However, when temperature fluctuates between hot and cold, the enamel is stressed and develops alligator cracking. As a result, Reclamation has observed reduced service lifetimes of coal tar enamel on many above ground penstocks and outlet works. This is remedied complete removal and replacement with epoxy or polyurethane coatings. This paper covers the proper methods and procedures for spot repairing minor damages to coal tar enamel linings using 100% solids epoxy coatings. The goal is to maximize service life and minimize coating maintenance costs.

Coal tar enamel provides an extremely long service life, under the right conditions. The Bureau of Reclamation (Reclamation) has observed more than 80 years of corrosion protection at facilities such as Hoover Dam. The coal tar enamel linings in penstocks and outlet works that are buried, encased, or in tunnels maintain excellent condition with minor damage. However, when temperature fluctuates between hot and cold, the enamel is stressed and develops alligator cracking. As a result, Reclamation has observed reduced service lifetimes of coal tar enamel on many above ground penstocks and outlet works. This is remedied complete removal and replacement with epoxy or polyurethane coatings. This paper covers the proper methods and procedures for spot repairing minor damages to coal tar enamel linings using 100% solids epoxy coatings. The goal is to maximize service life and minimize coating maintenance costs.

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