Stiffener between shell and bottom in storage tank
Stiffener between shell and bottom in storage tank
(OP)
I am technical engineer at petroleum products storage plant in La Reunion
We have 3 storage tanks built in 1960 and 1961 according to SHELL company standard
I have no technical documentation about these tanks
Inside tanks ,about every meter of circonference there are stiffeners looking like L welded on the shell (1.5 m height) and the bottom of the tank (1.5 m length)
At the construction the tanks were fitted with pressure and vacuum relief valve (Varec).
Now we have atmospheric events
I suppose that these stiffeners have been placed for strengthening the link beetween shell and bottom due to presence
of relief valve
I have to remove the old bottom plates and with them horizontal part of stiffeners
I think now it is not necessary to put again on the new bottom plates these stiffeners
We have 3 storage tanks built in 1960 and 1961 according to SHELL company standard
I have no technical documentation about these tanks
Inside tanks ,about every meter of circonference there are stiffeners looking like L welded on the shell (1.5 m height) and the bottom of the tank (1.5 m length)
At the construction the tanks were fitted with pressure and vacuum relief valve (Varec).
Now we have atmospheric events
I suppose that these stiffeners have been placed for strengthening the link beetween shell and bottom due to presence
of relief valve
I have to remove the old bottom plates and with them horizontal part of stiffeners
I think now it is not necessary to put again on the new bottom plates these stiffeners





RE: Stiffener between shell and bottom in storage tank
Whats the diameter of the tanks
RE: Stiffener between shell and bottom in storage tank
Thank you for your reply
tank n°13 diameter 7.65m shell height 7.76m
tank n°11 14.63m 9.30m
tank n°12 19.51m 14.82m
Best Regards
RE: Stiffener between shell and bottom in storage tank
RE: Stiffener between shell and bottom in storage tank
RE: Stiffener between shell and bottom in storage tank
1. Shell might be restrained against buckling and wind all together by vertical stiffeners,
2. The stiffeners might be working against the bulging effect on the shell close to bottom plate. see the stiffeners to increase the bending moment capacity.
3. Stiffeners on the bottom plate might be providing even load distribution on the foundation. You need to check foundation details.
4. There might be an event, such as an earthquake, in the past caused the buckling on the wall and tbey decided to support the shell bt this simple method.
In case you are going to put new one you had better to design it to the new code rules which may not be requiring those by increased wall thicknesses.
Regards,
Ibrahim Demir
RE: Stiffener between shell and bottom in storage tank
RE: Stiffener between shell and bottom in storage tank
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: Stiffener between shell and bottom in storage tank
RE: Stiffener between shell and bottom in storage tank
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky