Stability of vertical storage tanks
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The company installed a storage tank recently; it seems unstable, but I’m not sure. Could someone expert help determine whether it’s appropriate to install it in this way? 1. Vertical cylindrical stainless steel storage tank, with elliptical end caps at the top and bottom; no mixing mechanism; filled with water; 4 cylindrical feet, the tops of which are at the same level as the outer wall of the tank, and the bottoms of these feet consist of 300*300 mm plates ； 2. The leg height is 2m, the cylinder diameter is 3m, the cylinder with a head has a height of 5m; it can hold up to 30T of tap water, and the wall thickness of the cylinder is 6mm ； 3. Place it on the third floor inside, with each floor being 6 meters high; the third floor is the top floor, which has a sloped roof, so it’s higher and can accommodate it ； 4. The top of the tank is equipped with a fence, manholes, and toe boards; a ladder is installed on the tank wall. Since the legs weren’t secured with anchor bolts, they simply rested on the ground. There was a ladder on the tank body leading to the top; at any given time, only one person could climb to the top of the tank.
Based on the information you provided, the design of this vertical cylindrical stainless steel storage tank appears to be stable. A wall thickness of 6 mm for the tank is sufficient to withstand the weight load of 30 T of tap water, and leg heights of 2 m are also adequate to support the tank. The safety facilities such as fences, skirt guards, and ladders all meet the requirements, and it is also the correct practice to allow only one person on the tank top at a time. However, the issue regarding the legs not being fixed with foot bolts requires further detailed investigation. If the surface on which the container is placed is level and flat, preventing tilting or shaking, then the container should be relatively stable. However, if the surface on which the tank is placed is uneven, with significant tilting or shaking, it is necessary to reevaluate the way the tank is installed and the level of support provided, to ensure that the tank remains stable and reliable after installation. In short, it is recommended that you check the installation of the tank again; if possible, hire a professional engineer to conduct an on-site inspection and assessment to ensure the safe operation of the storage tank. .
This post was last edited by Forever_Zjveh on 2023-4-10 at 11:42. Thank you very much for resolving my doubts! I’ve been worried about the high center of gravity, and since it’s on the third floor, I’m afraid it might collapse due to earthquakes. We’re in Guangzhou; this year, there have been two minor earthquakes.
This is on the 3rd floor, with a floor elevation of only 10-15 cm; for containers of such weight, it relies mainly on the design of the container itself to prevent tipping over.
I can help you do the calculations; just give me the parameters. The main factors to consider are wind load, earthquakes, etc
As is standard practice, foot bolts need to be installed
This post was last edited by Forever_Zjveh on 2023-4-11 10:18. What parameters are needed? I have listed all the main parameters: 1. It is a vertical 316L stainless steel cylindrical tank with a diameter of 3000, a height of 3950; both the upper and lower elliptical end caps are 630 in height and 6 mm thick. There is no mixing mechanism, and material is pumped out from the bottom using a centrifugal pump, while it is fed in from the top ； 2. The 4 columns have a diameter of φ219*8; the height from the floor to the bottom surface of the lower end cap is 1480. The side length of the square plate on the floor is 350. The centers of the columns are aligned with the outer surface of the cylinder. At a height of 760 above the floor, the 4 legs are connected by horizontal square 10# channel steel ； 3. Fill with 30T tap water; total height of the side cage ladder is 7780 ； 4. The jar is placed on the third floor of an indoor building; the floor level on the third floor is 10,500, and the altitude above sea level in Guangzhou is 8,060. Are there any parameters missing? Thank you so much, I appreciate your help
It is necessary to verify whether the floor strength can withstand the load
Unqualified. The verification is complete. Do we need a calculation report? A magnitude 4 earthquake would be enough to cause problems
1. The connection between the leg and the tank wall may be substandard and requires verification. 2. It is necessary to verify the load-bearing capacity of the floor slabs.
The tank is placed on a beam specifically designated for that purpose on the third floor, and the supports were also positioned according to the location of that beam; the floor’s load-bearing capacity should be sufficient.