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August 31 - September 4, 2015

How do you remove all traces of an uncured internal coating from a tank when abrasive blasting is not an option?

Selected Answers

From Lydia Frenzel of Advisory Council on October 6, 2015:
The key to using HP or UHP water jetting inside a tank is to reduce any standing water, so use vacuum, sump pump, or lots of air flow to minimize dry time. I have heard of using dehumidification while using UHP WJ; it depends upon size of tank and configuration.

From trevor neale of TF Warren Group on September 9, 2015:
Depending on the size, location of tank and its appurtenances, it may be possible to place the tank into a stress-relieving oven and safely carbonize the the uncured and any other coatings and follow by reblasting to specification.

I suggest ultra high pressure water jetting, or, if the area is small,  remove the existing coating by scraper and solvent cleaning for residues.

From Tom Schwerdt of TxDOT on September 8, 2015:
If the coating is uncured, you may also be able to simply scrape off the bulk of it and solvent-wash the residue.

From Warren Brand of Chicago Corrosion Group on September 8, 2015:
I like the Sponge Jet idea, though the material is costly. Dry ice has a terribly low production rate and will likely only work if the existing material tends to embrittle, allowing the sublimation of the carbon dioxide to remove it. You may also be able to inject an aggregate into hp or uhp water blasting operations to improve the production rate.

From S. Matsumoto of Abraco on September 3, 2015:
Use ultra-high-pressure water jetting or a thermal remover.

From Michael Dwyer of Daubert Chemical Company, Inc. on September 2, 2015:
If water is objectionable, then consider the use of carbon dioxide/dry ice

From Alex Dionisopoulos of personal co on September 2, 2015:
Sponge jet blasting may be a solution.

From Warren Brand of Chicago Corrosion Group on September 1, 2015:
Removing all traces of an uncured tank lining may be a tough one, depending on the type of uncured coating you're dealing with. High-pressure or ultra-high-pressure water blasting should do the trick.

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Tagged categories: Abrasive blasting; Asia Pacific; EMEA (Europe, Middle East and Africa); Latin America; North America; Surface Preparation; Tank interiors; Tanks

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