It is often said that pressure vessels must meet stiffness requirements. How exactly is stiffness checked?
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I would like to learn some theoretical knowledge about stiffness verification; thank you to those who can offer guidance. It would be best if a concrete example could be given
It seems there’s no way to calculate it; most of the time, it isn’t calculated at all, and people rely on experience instead
I believe that the external pressure verification of the equipment, the calculations regarding axial stability, the requirements for the minimum wall thickness of the equipment, the additional requirements in the calculation formulas for various components, as well as some of the constraints, all reflect the requirements related to stiffness; pay attention to these and you will understand.
Sometimes, when it comes to transportation and lifting, the issue of stiffness also needs to be taken into account. There are no detailed formulas for determining stiffness; instead, the minimum wall thickness is determined by drawing on past experience.
At least one of them has a stiffness requirement, which is that the thickness must be at least twice the diameter divided by 1000. This is a condition to ensure the stiffness of the cylinder.
Stiffness is generally considered only when the design pressure is very low and the wall thickness is thin. Additionally, for towers, which are elongated structures, their stiffness during lifting must also be taken into account. Typically, the wall thickness should be at least 500 times the inner diameter; a corrosion margin is also added in addition to this.
The minimum thickness specified in GB150 is related to stiffness requirements; furthermore, the axial stability calculation of cylinders also falls under the category of stiffness
You can learn it on your own*. Ah, there are many learning materials available on this topic; you can download them and start learning.
I’m very grateful for everyone’s responses. Today I asked an experienced engineer from our company, and he said that, especially for low-pressure containers with thin walls, it is generally sufficient to consider the load they need to support and ensure that the walls can handle it. . . But so far I’m still completely confused; there really is no method, only experience? Humans have developed over such a long period of time; it can’t still be just a matter of experience.
I read a paper that contained calculations regarding stiffness.