Life Extension of Column Base
Life Extension of Column Base
(OP)
I am going over many of the older columns in a thermal generating plant, which have been exposed to a corrosive environment, mainly in the lower 6 to 8 inches of the column base. The steel is delaminating severly on some of them, and is deteriorating quite significantly with regards to its thickness.
I have seen two solutions done within the plant before: temporarily shoring the column, removing the lower 3', and welding in a new column section followed by proper coating. The other solution was welding a 3/4" thick steel plate on the web of the W-section column about 12" up from the bottom. This appears to have helped greatly in extending the life of the column, but I am not sure if this is good practice or just a guessed-patch job by a fabricator.
Is there any way to determine practical reinforcing plate thicknesses and dimensions to weld to the web's of these columns to extended the life of the columns without full replacement? I of course want a cost effective way to reinforce the existing web and flange material of these W-section columns and to prevent futher deterioration. Any suggestions are greatly appreciated!
I have seen two solutions done within the plant before: temporarily shoring the column, removing the lower 3', and welding in a new column section followed by proper coating. The other solution was welding a 3/4" thick steel plate on the web of the W-section column about 12" up from the bottom. This appears to have helped greatly in extending the life of the column, but I am not sure if this is good practice or just a guessed-patch job by a fabricator.
Is there any way to determine practical reinforcing plate thicknesses and dimensions to weld to the web's of these columns to extended the life of the columns without full replacement? I of course want a cost effective way to reinforce the existing web and flange material of these W-section columns and to prevent futher deterioration. Any suggestions are greatly appreciated!






RE: Life Extension of Column Base
But I like the first way (shoring and replacing) a lot better. You don't have to worry about any little areas of corrosion being left and continuing to spread into the new fix. And you're assured of getting bearing of the new entire section on the base plate. Plus it will be easier to coat, without a bunch of nooks and crannies.
RE: Life Extension of Column Base
Don't be too concerned about a cost effective solution. While that is a goal, in an industrial plant keeping the plant operational is far more important. Later, if structural failure results in an unplanned plant outage, the fact that the repairs were cost effective will be an absolutely worthless explanation.
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RE: Life Extension of Column Base
RE: Life Extension of Column Base
PS;
the reason I didn't stay close to this job it was our group who inspected and put out a memo about the inspection and requesting that the structural and civil group take a look at affected columns. They didn't get the memo, they say, and the maintenance group took it on their own to fix the problem.