Adequacy of Storage Tank

[GauravWalia]

There is a storage tank with External floating roof in India.
I have been given a project to provide the Aluminum Dome over the tank.
The design part is completed. Only the adequacy check part for the tank is left.
Can anyone suggest me what checks are required?? How will i ensure that the shell of the tank is sufficiently stiff to carry dome loads to the foundation?? Are their any codal guidelines??
I noticed that API is silent about that.

 

[TehMightyEngineer]

Not sure which code governs in India but here in the states the governing code depends on the material stored in the tank.

Ian Riley, PE, SE
Professional Engineer (ME, NH, VT, CT, MA) Structural Engineer (IL)
American Concrete Industries

https://www.facebook.com/AmericanConcrete/

 

[IFRs]

API 650 G lists concerns but not methodology to check - strength checks are left up to the designer

 

[Klitor]

To simplify a bit, aluminum domes mostly carry only vertical compressional load into the shell so you shouldnt have a probem.
In my area i would use eurocode 1993-1-6 and run various shell buckling checks.

 

[dhengr]

GauravWalia & Klitor:
Does a floating roof, an aluminum dome, produce a vertical loading on the tank shell, or just an additional fluid pressure loading in the radial direction, on the shell?

 

[JStephen]

Check compression at the support points. This will usually involve some type of stiffened chair assembly.
Check radial loading at the support points. If the support points are sliding, this is usually fairly small, and the existing tank wind girder may be adequate for them. If you use fixed support points, you may need an additional or larger wind girder for the radial loads.
One of Roark's load cases is N radial loads on a circular ring, which can be handy here.
Check for roll-over moment due to the radial load being well above the web or centroid of the wind girder.
Check overturn of the modified tank.
Consider checking actual out-of-round tolerances at the top of the shell when empty.

 

[Klitor]

Dhengr,
The roof in question is not an internal floater (eg. Pan type or pontoon), it is external dome supported on upper most shell course.
Jstephen summed up nicely, offcourse if seismic or very high wind load is present things can be a bit more complicated but OP should have given info about those parameters