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Trials and Tribulations with Finding the Optimal Lining Material

Historically, the Bureau of Reclamation observed coating service lives of 50 to 80 years when lining its water conveyance structures with coal tar enamel. Changes to regulations have largely eliminated coal tar enamel as a field coating option, and existing coal tar enamel is beginning to show signs of degradation or has already been repaired or recoated. Reclamation has been working to find an appropriate alternative to coal tar enamel.

Product Number: 51219-218-SG
Author: Stephanie Prochaska, Allen Skaja
Publication Date: 2019
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$20.00
$20.00

Historically, the Bureau of Reclamation observed coating service lives of 50 to 80 years when lining its water conveyance structures with coal tar enamel. Changes to regulations have largely eliminated coal tar enamel as a field coating option, and existing coal tar enamel is beginning to show signs of degradation or has already been repaired or recoated. Reclamation has been working to find an appropriate alternative to coal tar enamel. Elastomeric polyurethanes have superior flexibility and abrasion resistance, with expected service lives between 20 to 40 years. However, adhesion and delamination problems observed both in the laboratory and in the field currently render them unsuitable for most of Reclamation’s needs.

Historically, the Bureau of Reclamation observed coating service lives of 50 to 80 years when lining its water conveyance structures with coal tar enamel. Changes to regulations have largely eliminated coal tar enamel as a field coating option, and existing coal tar enamel is beginning to show signs of degradation or has already been repaired or recoated. Reclamation has been working to find an appropriate alternative to coal tar enamel. Elastomeric polyurethanes have superior flexibility and abrasion resistance, with expected service lives between 20 to 40 years. However, adhesion and delamination problems observed both in the laboratory and in the field currently render them unsuitable for most of Reclamation’s needs.

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