Steel Tank
Steel Tank
(OP)
I have a 12' dia. steel tank, right circular cylinder with an open top containing water. I want to construct a catwalk across the top and support the catwalk on the edge of the tank. The tank provides a knife edge support for the channel of the catwalk.
The load from the catwalk is relatively small. Is there a simple method of determining the effect of the point load on an unstiffened edge of a tank? The tank is constructed of 5/16 material, likely A36 or something of that ilk.
Dik
The load from the catwalk is relatively small. Is there a simple method of determining the effect of the point load on an unstiffened edge of a tank? The tank is constructed of 5/16 material, likely A36 or something of that ilk.
Dik






RE: Steel Tank
Usually, there would be some kind of chair or stiffener at a platform support. Figure the load spreads out at, say, 30 degrees from either side, and extend the stiffener however far it takes to get the allowable load.
RE: Steel Tank
2. From my past experience, for steel tank with WT 6 mm, tend to be overstressed by a platform load. assuming the platform width = 1000 mmm and LL = 2.5 kPa.
3. Another option is provide a repad on the tank surface to spread the load or remove bending moment by adding a brace instead of cantilever out (will still need a repad, but thinner than cantilever out.)
RE: Steel Tank
RE: Steel Tank
JStephen... thanks for the heads up on the codes; I'll take a quick gander and see if there are any 'prescribed' approaches.
Zhuge... I was thinking of securing the platform channel to the tank with BAR 2x1/4 welded to the channel and to the tank wall. This will provide a local stiffener for the tank as well as load transfer. I don't have anything to compare it to.
ChipB... thanks for the lead re: Gaylord... I'll see if I can dig up a copy. I don't think it's a problem, but I'd like to have a methodology of checking it without resorting to a quick finite element run...
Dik
RE: Steel Tank
RE: Steel Tank
Dik