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Fixed roof tank jack up for bottom replacement

Sunday, March 11, 2018   By: kavi [1926] 0 Stars
hello gents ,

we are executing BOTTOM REPLACEMENT WORK on existing one fixed roof fire water tank resting on 6 columns and center columns of 8 inch pipe.

could any one let me know what is the best and safest method how to jack up the tank shell and all 7 columns to gather so bottom plate replacement can be done.

best regards


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Monday, March 12, 2018   By: Tankee [235] 4 Stars
I have never done, or seen it done, where you jack all of the tank up and replace a bottom. Not to say it cannot be done, or should not be done if the contractor has an approved, safe, and engineered procedure. Are you doing a secondary bottom, or replacing the whole bottom? Both are similar, yet completely different. We can give better advice if we know which. Main thing is to hire a reputable tank repair company, and not someone that wings it under your direction.

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Monday, March 12, 2018   By: kavi [1926] 0 Stars
that s true we are replacing the complete bottom .as it is corroded and requires to replaced .

best regards

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Monday, March 12, 2018   By: ITS [1678] 4 Stars
I agree with Mr.Tankee, for floor replacement needs to be done by experienced contractor. So, a complete bottom floor replacement generally means under the shell joint and then working with the columns as well. As you said the floor plates are not so insurmountable by themselves.

There are different methods, so to determine what method is best or good for your aboveground storage tank complete floor replacement is to seek an experience contractor with a skilled professional engineer and they will make it easy for you and the owner. This is not what you are looking for, but this is too difficult to ask over a bulletin board. Good luck.

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Thursday, March 29, 2018   By: BABRTs 973 [53] 5 Stars
Slotting the shell and replacing the sketches under the shell then putting in new floor plates jacking the support columns one at a time is the common way to do this. A lot easier to keep the tank round than what you are wanting to do.
Not to say it cant be done, but if it was a easy way to do it, contractors would have been doing it this way for years.

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Published on ast-forum.com


Atmospheric Design Pressure
By: Fathi [46]

The whole story is to avoid brittle fracture=

Test temperature shall be equal or warmer than Minimum Metal Design temperature at Test pressure.

I would limit my minimum testing temperature for a tank (or even for a vessel or a piping system) by the =

Temp = maximum of [ Min(lower shell) , Min(shell# 2) ....Min (Upper shell) ]

For a Shell# i the minimum is function ( of shell tickness , Material group ) and this can be found in API 650 , Fig 2-1

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