Sprinkler Water Tank Repair and Fibreglass Lining - Sheffield This 30 year old 'Galglass' fire sprinkler tank was leaking badly from random areas all around the tank. The only repair system that was going to restore this tanks integrity and make it watertight was the application of our guaranteed for 25 year fibreglass lining system. Previously the only way into the tank was from the roof, through the BVH (Ball Valve Housing) and then a ladder down to the tank floor. So to work safely inside the tank we installed a safety access hatchway into the lower wall of the tank at ground level. Fist things first...the surfaces had to be cleaned and keyed by abrasive grit blasting. This process exposed all the weaknesses in the steel wall of the tank and highlighted the areas for repair...lots of them. After grit blasting, the surfaces were primed with polyester resin and all the holes, corroded areas and panel seams repaired and reconstructed using layers of fibreglass matting. Once all the repairs had cured, a double skin fibreglass lining was applied to the complete wall surface area, sealing onto the concrete floor all the way round the inside corner of the tank. When the completed fibreglass lining had cured, a coloured polyester gel topcoat was applied to seal the whole system guaranteeing our works for 25 years. A week after starting our works... we bolted up the new access manway and the client put the tank back into service.