Just in case the steel frame is going to carry plastic tanks as usually obtainable in nigeria you can model the floor plate only and apply pressure load on the plate to represent the weight of the tank and water.
Elevated steel water tank design example.
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Among elevated steel water tanks a multi column or multi leg design is the most cost effective choice in most circumstances.
This can be achieved by using the mesh tool.
The tank consists of a welded steel container supported by multiple welded steel legs perimeter columns and a central welded steel riser.
In this video lecture you are able to learn how to design a water tank for a small family.
Of coke coal grains etc steel aluminium concrete or frp tanks including elevated tanks for the storage of water spherical tanks pressure vessels for the storage of high pressure liquefied gases and under ground tanks for the storage of water and oil.