Case study: GRP lining a water storage tank

The client

South Essex College is a major Further and Higher Education provider, providing skills, learning and careers training at three campuses in Basildon, Southend and Thurrock. The College had problems with a water storage tank at its Basildon campus.

The problem - a leaking GRP water storage tank

The large GRP water tank was in a hard-to-reach loft space above a stairwell. It was leaking from the joints, but it was impossible to determine exactly from where. The body of the tank itself was in good order and wasn't damaged or worn.

The water tank repair presented a series of challenges. Although the tank was drained, there was still some water in it. And because it was impossible to get the equipment in, grit blasting was out of the question.

The solution - hand preparation and GRP fibreglass lamination

First we dried out the tank by pumping out the water and using two extractor fans to remove any moisture. Then we abraded the surface using hand held grinders, ready to apply primer followed by fibreglass lamination, a resin coat and finally a top coat.

We then filled and sealed a series of baffles with foam, eliminating any potential weak points.

The result - a watertight sectional tank, in a week

Sui Generis's experienced team was able to repair the tank with a GRP lining within a week with minimal disruption, despite the challenges posed by poor access, baffles, bolts and infill panels.

The College was delighted with our lining service, which ensured its tank will be serviceable for many years to come.

Specialists in water tank repair, storage tank refurbishment, potable water tank linings, with GRP fibreglass

Braithwaite tank repair with fibreglass liningSurface prepared for lining

Grit blasting was not suitable due to the small enclosed space, it was simply not possible to get blast equipment in. Our specialist linings team completed the preparation by hand, abrading with hand held grinders.

Braithwaite tank repair with fibreglass liningJoints filled and sealed with GRP

Along the base of the tank are a series of baffles, these were hollow and had to be filled and sealed. The panels were filled with foam, when set, completely encapsulated to eliminate any possible weak points.

Braithwaite tank repair with fibreglass liningWater sprinkler tank repair with fibreglass liningFibreglass lining to walls & floor

Two layers of GRP fibreglass matting impregnated with resin and allow to cure. Followed by a resin coat and allowed to cure.

Braithwaite tank repair with fibreglass liningCompleted GRP tank lining

During the final stage of the tank lining application, we applied a resin coat. All surfaces were then sanded and a final top coat added to ensure a complete seal. With a further quality inspection the tank were returned to normal service.

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