Storage tank stiffness issue
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When designing storage tanks, heat exchange equipment, and towers, especially those operating at normal or low pressures, the wall thicknesses calculated using formulas are quite thin; even after taking into account minimum thickness requirements and additional allowances, the wall thicknesses remain low. For devices with larger diameters, it is necessary to consider the stiffness of the device – so how can a nominal thickness be determined that ensures the required stiffness? Is there a calculation for device stiffness? How should the wall thickness be designed in such a situation? Is it designed based on experience? Could this lead to waste of materials or pose certain risks?
There are some discussions on this topic in the forum; take a look: http://bbs.hcbbs.com/viewthread.php?tid=387233&highlight=%B8%D5%B6%C8 http://bbs.hcbbs.com/viewthread.php?tid=244437&highlight=%B8%D5%B6%C8 http://bbs.hcbbs.com/viewthread.php?tid=108520&highlight=%B8%D5%B6%C8
I’ve checked the connections mentioned above, but it seems there’s still no clear answer. Why post more related questions? Surely many people share the same doubts. Is there anyone who can provide a clear explanation?
Experience points work too; please share them so we can discuss them together
There is no rigidity issue with storage tanks; stability should be considered at low or normal pressure.
You can calculate it according to GB50341; the regulations there are very detailed. Take a look for yourself.
This is how I understand this issue: First, it should be divided into two parts: one is pressure vessels and general equipment, and the other is large storage tanks. Discussion 1: Both GB150 and JB/T4710 specify minimum wall thickness values, which are determined with regard to the stiffness of the equipment. But in my opinion on this issue, JB/T4710 is more reasonable. The reason is that it is clearly unreasonable for GB150 to use a single value regardless of the equipment’s diameter, as this fails to ensure the stiffness of the equipment; whereas JB/T4710 takes the diameter into account, and using 2D/1000 is a reasonable approach. Discussion 2: The minimum thickness specified for large storage tanks takes stiffness into account as well; structural elements such as edge angle steel, wind-resistant rings, and reinforcement rings are also considered. Essentially, the effect of wind forces is taken into account and converted into an external pressure for calculation purposes. The above are my personal opinions, for discussion only.