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Ashiq Hussain on TANK BOTTOM PLATE U/S CORROSION

By: Ashiq Hussain 
Date: Friday, May 16, 2003
Time: 12:00:00 AM

Tank (AST)foundation design at our plant is Asphalt concrete layer supported on top of crushed stone and soil. The advantage for such foundation design was to avoid underside corrosion of tank bottom plates. Also it was difficult to install CP system because asphalt concrete is non conductive to electric current flow. But unfortunately the design which was thought to be fool proof did not work. What happened was , the rain water and wash water continued to ingress under the bottom plates due to non uniform slope at the bottom. Literally some of the tanks had perforrtions through their bottom plates which was having a thickness of about 7mm. Different available options for bottom repair were discussed such as installation of new bottom plate, installation of FG lining etc. Finally we decided to repair the affected areas with welded on patch plates of varying sizes. Plus installation of a flexible sealant around the tank bottom to seal any ingress of water. Kindly comment, if this solution makes sense or we are going to end up with the same problem after some time. or what would have been the best repair method economically instead.



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