Opening issue in the central roof plate of vaulted storage tanks
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Overview description: Tank renovation. Vault tank, design pressure -490-1960 Pa, design temperature 80 degrees. Inner diameter φ20000, ribbed vault SR24000, outer diameter of the central roof slab φ2100, diameter of the central hole in the tank roof φ2000, design pressure -490-1960 pa, design temperature 80 degrees. The original center roof was fitted with cross rib plates, without any openings. A φ1600 access opening is to be created in the ceiling of the center, in the form of a pipe flange, for transporting equipment into the tank; it is sealed with a cover plate during normal operation. Question: After the opening is made in the central roof, the grid ribs are cut off and flange connections are welded on. Could such modifications cause instability of the tank roof? If instability does occur, what measures should be taken to prevent it? I would appreciate your advice. Thank you.
This requires stress analysis calculations; it must be designed by designers with the appropriate expertise, and cannot be determined simply.
I don’t know what will happen, so I haven’t made any changes yet.