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July 16 - July 20, 2018

What percentage of deterioration is acceptable at a one-year warranty inspection of water tank linings before a contractor must repair the coating job?


Selected Answers

From Erik Andreassen of CPS on July 18, 2018:
I agree with previous letters; however, the phrase "What percentage is acceptable" is wide open. The warranty would have been signed for a length of time at the contract award. Any repairs within 1 year would be covered, no matter what percentage of deterioration.As Larry states, if the correct selection of lining has been both specified and applied correctly, there should be little or no damage to the system.

From trevor neale of TF Warren Group on July 17, 2018:
I agree with Larry--when expertly applied, properly selected coatings are specified, there should not be any defects visible after 12 months, unless the coating has been mechanically damaged by others.

From Larry Muzia of Exceletech Coating & Applications, LLC on July 16, 2018:
It is my position that no failure should be evident at one year. If the proper coating selection has been made in conjunction with proper application of the product to include surface prep and environmental controls, any evidence of failure should be many years away. Recently, I was involved in recoating a municipal potable water tank in which the existing coating had solvent entrapment from improper circulation during the application and cure of the coating. I can see this as an issue when applying coatings in an confined space.

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Tagged categories: Inspection; Linings; Quality Control


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