How can one determine whether the stiffness of the equipment is appropriate, so as to prevent deformation of the equipment?
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Our company is now preparing standardized drawings for a set of equipment. The design pressure is 1.0 Mpa; the cylinder diameter ranges from 300 to 700, the material used is S30408, the cylinder thickness is 3 mm, and it is 4 mm for DN700. The strength calculation is sufficient; how can we determine whether the stiffness is appropriate and whether it will cause deformation of the equipment? :)
The internal pressure will not become unstable. Meeting the minimum stiffness thickness requirement is sufficient.
How is the minimum stiffness thickness determined?
The calculation is rather complicated; if it’s not a tower, sufficient thickness will ensure that the stiffness requirements are met.
The tricky part is that rectangular containers, horizontal containers, jacketed containers, vacuum containers, and heat exchangers have minimum required thicknesses; for rectangular containers, horizontal containers, jacketed containers, tower vessels, and vacuum containers, it is best to calculate based on standards.
Relevant standards specify a minimum thickness; does that mean that meeting this minimum thickness also satisfies the stiffness requirements?
The minimum thickness is only a minimum requirement; comprehensive considerations include corrosion, manufacturing, transportation, external loads (platform attachments, wind and snow loads), as well as indoor and outdoor environments
Consider the external forces acting, perform a rough calculation of the external pressure, and if it’s satisfactory, that’s about it. It is also possible to use ANSYS for modeling linear buckling analysis.
Under what conditions does stiffness come into play? For internal pressures, strength is generally the only factor considered, but the requirement for minimum thickness must also be met. In cases where there are local external forces, calculations should be carried out in accordance with HG20580 to determine whether the requirements are satisfied.
While meeting the minimum thickness requirements specified by relevant standards, and taking into account the external forces acting on it, a rough calculation of the external pressure is carried out; in the absence of significant external loads, it is generally sufficient to ensure that the minimum thickness requirement is met