Regarding the use of no spring when the vertical displacement is below 2 mm
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When using Caesar II software to analyze the selected springs, it is common to encounter situations where the vertical displacement is less than 2 mm. I recall there being a rule stating that in such cases the component should be treated as a rigid support; however, I can’t remember which standard specified this, or whether it is a universal requirement.
It is not recommended to do this; I tried a vertical displacement of 1 millimeter, and changing the stiffness resulted in unacceptable stress levels.
It seems to be the piping design specification of Sinopec Luoyang Research Institute; under normal circumstances, springs are selected based on the design conditions, with a deflection of basically over 2 mm.
Since you’re using CII, why not simply change the spring to a rigid one in the model?
The teacher in the training video said that using springs for a vertical displacement of 2–3 mm doesn’t make much sense; as for the standards, they probably won’t specify this directly