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August 27 - August 31, 2018

Is it necessary to holiday test the interior lining in the vapor phase (roof) of water storage tanks after coating?

Selected Answers

From Josh Skinner of The Sherwin-Williams Company on September 25, 2018:
Absolutely!!! Most interior roof spaces contain a lot of irregular steel surfaces. The more edges, outside corners, crevices, welds, bolts you have, the greater your potential for holidays.

From Bryant Chandler of Greenman-Pedersen, Inc. on September 6, 2018:
Necessary, no. In most large tanks with roof rafters, the roof plates are not seal-welded to the rafters. The interface between the roof plate and the top flange of the rafters cannot be tested. Attempting to caulk the roof plate to rafter gap is expensive and has limited life, especially when maintenance personnel walk on the tank top, flexing the roof plates and breaking the caulking joint. On small tanks without rafters, then holiday testing has some merit if the owner wants to pay for it, considering access to the center of the roof for testing and touch-up can be expensive.

From Larry Muzia of Exceletech Coating & Applications, LLC on August 31, 2018:
Yes, Bill, it is I and hope you are well. Best Regards

From Bill Dollarhide of Individual on August 29, 2018:
If the person who provided the answer is the same Larry Muzia who once worked around Cape Canaveral many years back, then I, of course, agree with him, and also because we have re-blasted and coated a lot of undersides over the years.

From Larry Muzia of Exceletech Coating & Applications, LLC on August 28, 2018:
As there is more available oxygen above the liquid, it is very important to have a pinhole-free lining, so my reply is Yes !

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Tagged categories: Holidays; Quality control; Quality Control; Site/field testing; Tank roof; Testing + Evaluation; Water Tanks

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