A condensate tank is having a crevice corrosion between the annular plate and the concrete ring base of the tank. Rain water is seeping through the crevice causing corrosion but only on some parts and not on the whole diameter of the tank. Leak test result is negative. We need to remove all the water in the crevice, dry the crevice then protect it with an anti-corrosion coating. Any method in the elimination of the water you can suggest? Thanks in advance. ladycroft39

Thank you for your idea. I will keep you updated. Regards, Ladycroft39

Dear All, Thank you for all your suggestions. I am greatly considering every feedback and consolidating them. As an update, last night, I was able to have a chance to talk to an Offshore Engineer. His idea comes in 3 ways and I would like to share it with everybody for comments. 1. Since the client required no lifting of the tank and no shutdown, we are only limited to applying a corrosion inhibitor or an epoxy at the problem area. This is only a temporary repair. The client wants to determine how much water has gone in, but with limited access, we can only break a part of the concrete base and try to insert a boroscope. The amount of water and the extent of the corrosion have to be determined to fully arrest the problem. 2. Breaking parts of the concrete but avoiding the supports underneath the tank and then jacking up the tank. This must be done with a shutdown as we have to disconnect the pipes connected to the tank. 3. Let the corrosion grow but must have a second support above the corroded area. Every 5 years, the Thais require a plant an inspection wherein they have to put the plant or part of the plant in a major shutdown. We can use #1 method and suggest to them to have the tank scanned with UT from the inside to determine the extent of the damage and repair the whole thing from there while it is not in operation. By the way, the floor of the tank has a design with an angle of 120 degrees from the center sloping down to 0 to the annular plate. The tank has a fixed roof. For comments please. Thanks and regards, Ladycroft39