Vertical inclined-bottom storage tank
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For vertical storage tanks with a small volume, which have an inclined bottom along with an inclined support structure, how is the bottom of such a structure welded? For the inclined bottom and the tank wall, is only inner corner welding required, or welding on both sides as well? How can it be strengthened without support here? Are there any requirements regarding plate thickness and welding sequence? I’d like to ask the experts!
This structure has poor stress resistance, and it is difficult to control the quality of its fabrication; it is better to provide bevels on the edges of the tank bottom plate and carry out fusion welding with the pipe walls
Why does it have to be designed with a sloped bottom? Are there any constraints?
There are no restrictions either; it’s just for draining liquid.
It is mainly for drainage; the inclined supports at the bottom are welded intermittently
It is normal to design a sloped bottom for drainage; this depends first on the diameter of the storage tank and the liquid level height, and second on the inclination angle of the tank bottom. Some have the bottom of the tank designed to be inclined, but the tank foundation is horizontal ； There are also designs where both the bottom of the tank and its foundation are inclined. Analyze and calculate each case specifically, and adopt a reasonable structure.
When a sloped bottom combined with a horizontal tank foundation is used, steel rebar can be installed at the bottom of the tank; if the diameter is small, one rebar bar or cross-shaped rebars will suffice, while for larger diameters, grid-shaped rebars can be used. Where double-sided welding is possible between the tank bottom plate and the tank wall, continuous double-sided welding should be carried out wherever feasible ； If single-sided welding is used, a fully penetrated single-sided structure should also be adopted. The gusset plates and the bottom plate of the tank should be welded with intermittent welding on both sides, while the gusset plates should be welded together with continuous welding on both sides.
The small tank has no foundation, and its volume is around 10 cubic meters; its diameter is 2 meters. Is it necessary to reinforce the junction between the bottom plate and the tank walls? Will there be stress concentration?
This post was last edited by sdswypf on 2020-4-5 at 12:22. I’m sending this to you for reference; the calculations can be based on the reinforced flat cover model.
This post was last edited by sdswypf on 2020-4-5 at 12:26. The one I’m sending you has a flat bottom; you can adjust the bottom part to the desired inclination angle. This cylinder is made of stainless steel, while the stiffening plates are made of Q235B. The thickness of the gusset plate should take into account the specific corrosion conditions.