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Storage Tank Corrosion

Abfad Limited were appointed to refurbish a 250 cubic meter acid water process storage tank for one of our power generation clients. The condition of the tank steel was very poor with severe corrosion pitting evident and a complete breakdown of the existing coating. This had been applied several times by another company, but continued to fail.

“Multiple coating failures, severe corrosion, watch the video to see how we brought this storage tank back to health”

What is Pitting Corrosion

In underground tanks, pitting corrosion is one of the most common types of storage tank corrosion we find. This type of storage tank corrosion can be one of the most serious.

Pitting corrosion is a localised form of metal deterioration which displays as small pits or holes on the surface of the steel. This causes a loss of thickness to the metal.

Pitting corrosion is often found in storage tanks that aren’t protected with a lining, or have incorrect preparation. Meaning the lining quickly becomes ineffective as it starts to peel away, leaving the steel vulnerable to corrosion.

If nothing is done, eventually this will cause a breach in the tank and lead to leaking product into the surrounding environment.

Pitting corrosion found in above-ground storage tank

Preparing the Steel

Correct preparation and blasting to the required standard are vitally important when lining any storage tank.

The tank in question was blasted to SA2.5 standard, removing the existing failed coating and providing a blast profile of over 140 microns. This ensures good adhesion of the solvent free coatings that Abfad use for storage tank lining.

Solvent Free Coatings to Solve Storage Tank Corrosion

A suitable solvent free coating was chosen which had superb chemical, assorted acids, and water-resistant properties.

Once the sections of the tank were coated all areas were inspected for pin holes or any discontinuities in the coating. These were then repaired, ensuring the internal tank steel had full corrosion protection.

The benefits to the client having a solvent free single skin lining are huge, this new internal lining acts as an effective block between the tank steel and the stored product, creating a corrosion resistant barrier.

This ensures the storage tank has a longer operational lifespan. The new solvent free tank lining also aids in reducing maintenance and repair costs down the line, all of which lead to increased profits.

Solvent free coatings provide a reliable, proven, long term solution to end storage tank corrosion.

 

Storage tank lining completed

Solvent free tank lining helped save this storage tank from severe corrosion