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When WIT Inc. was asked to rehabilitate the Alta Vista Standpipe, the first order of business would be to conduct a comprehensive tank evaluation in order to determine the overall condition, and also, to compile an inventory of deficiencies, repairs and upgrade objectives so that the project manual for the bid phase would include all necessary work to bring the tank to current AWWA standards.
When WIT Inc. was asked to rehabilitate the Alta Vista Standpipe, the first order of business would be to conduct a comprehensive tank evaluation in order to determine the overall condition, and also, to compile an inventory of deficiencies, repairs and upgrade objectives so that the project manual for the bid phase would include all necessary work to bring the tank to current AWWA standards (while feasibly achieving the customers long term goals). When the tank was drained for the evaluation, it was immediately apparent that this would not be a typical pre-design evaluation or design project.
Barrier and inhibitor coatings are the primary defense against steel loss in water storage tanks. However, as a coating begins to deteriorate, action is necessary to prevent steel loss in the exposed areas of the substrate. Cathodic protection systems are an economical way to address preventing metal loss on the submerged surface areas of a water storage tank and have been proven to extend the useful life of coatings for immersion service.
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The above ground storage tanks in the refinery are experiencing bottom plate underside (soil) corrosion at a high rate of 1mm/year. Results: Failure of 4 tanks within a period of 9 years. Observations, details of the CP survey, tests, results and forward path taken up.