NOTICE

Forums are temporarily disabled while we are working on a new login procedure.

When migrating the old forums over to our new forums we were unable to retain the identity of the authors, so the old posts will show up as "anonymous". All NEW posts will show up credited to their authors. So please participate and share knowledge just as you have in the past.

You must log in if you are an existing user or register if you are a new user in order to contribute to the discussions.

Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Annular Plate CorrosionAnnular Plate Corrosion
Previous
 
Next
New Post
6/12/2007 9:00 AM
 
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
 
New Post
6/13/2007 9:00 AM
 
If your annular plate has not been defleted the crevice will be less and water seepage will be less. As such you can directly inject pressurised fine concrete slurry which will cure there. After that a bituminous paste can be applied. regards
 
New Post
6/13/2007 9:00 AM
 
Thank you for your idea. I will keep you updated. Regards, Ladycroft39
 
New Post
6/15/2007 9:00 AM
 
Ladycroft39 Debasis had suggested bituminous paste after fine concrete pressurized injection. If the area to be arrested from crevice sealing (between concrete base and cndensate plate bottom shoulder plate gap) for the annular plate to concrete gap or crevice is not large, you could try epoxy putty application after fine concrete pressurized injection (epoxy paint application - hand troweling) to make it a paste which will be water impervious than bituminous paste if rain fall is heavy at your place. In some cases quick sealing epoxy with concrete pressurized injection sealing may be available. Epoxy hand trowel application of a paste of 2-3 mm thick, after intial fine concrete pressurized injection sealing to arrrest the small cracks or crevices between the annular plate adn concrete base ring foundation will give very tight and impervious coating from rain water entry in future Trust this will help you C.V.Srinivasan Nishi Engineers Pvt Ltd India E-mail: nishi@vsnl.com >Thank you for your idea. I will keep you updated. > >Regards, >Ladycroft39
 
New Post
6/16/2007 9:00 AM
 
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
 
Previous
 
Next
HomeHomeDiscussionsDiscussionsGeneral Corrosi...General Corrosi...Annular Plate CorrosionAnnular Plate Corrosion


  

News

With a little delay, our Calculation of Ammonium Salt Deposition Temperatures...read more
Our sulfidic corrosion calculators are now available at hghouston.com/calcula...read more

Stay Current

Sign up for our quarterly newsletter

covering updates on corrosion

Sign Up