Tank dia

[Engr ZANIA]

Hi,
our contractor has constructed tank's ring wall of slightly shorter than required, around 400mm, is there anyway to fabricate the tank without compromising the capacity.

Ps: adding an another course is little difficult at this stage.

 

[LittleInch]

No.

Pay him less.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[HTURKAK]

If the shell ht 400 mm less than required, the gross capacity ( Maximum capacity ) will also be less proportional with ht.
But , you may check minimum operating volume remaining in the tank.. If you can manage to reduce min. fill level.. Why not??

 

[LittleInch]

How big's the tank?

400mm in 80m is a lot different than 400mm in 3m.

But like for like, still no.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[IFRs]

Please clarify what you mean by "ring wall".
To me it is the foundation.
If it is the foundation, why would a lower foundation affect the tank capacity?

 

[Engr ZANIA]

They have shortened the dia of ring wall foundation..

 

[HTURKAK]

Eng. ZANIA,
Will you provide more info. ( size of the tank, foundation details, service ...)
Is the tank manufactured and ready to install?
Your first post implied ( ring wall ) and compromising the capacity implied the shell rather than ring wall foundation.

 

[LittleInch]

engr zania,

Simply repeating the same non specific information and not answering the questions means we can't help you.

please look at the posts and answer the questions.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[IFRs]

To maintain the tank capacity if the dank diameter needs to match the ringwall's smaller diameter your only options are to fix the ringwall or increase the tank height. Since you said adding a shell course is not an option, increasing the tank height can only be done by increasing the height of one or more of the shell courses. Several things would need to be reviewed including the shell plate thicknesses and grades, stability in wind and seismic conditions, foundation strength, fixed roof support column(s), etc.

 

[JStephen]

It may be possible to recover part of the reduction by shifting the tank towards the outside face of the ringwall rather than being centered. This affects the forces and force distribution on the ringwall as well, and would need to be reviewed by the designer.
It might be possible to put outside forms, additional steel, and add concrete outside the existing ringwall. I haven't seen this done, and am not sure about the feasibility of it.

 

[IFRs]

Is the ringwall 400mm smaller in diameter or radius than the design?
Is the ringwall resting on engineered fill, bedrock, a concrete footer, piles, etc?
Is the ringwall is there to only retain the soils under the tank?
Is the top of the ringwall at grade?
Is there some reason that the ringwall can't simply be fixed?