Regarding the issue of positive-pressure equipment’s resistance to negative pressure
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In production, I encountered a situation where pressure vessels originally designed for a positive pressure of 0.5 MPa had to face the possibility of experiencing negative pressure when shut down. I would like to ask what kind of negative pressure this device can withstand without deforming. How to calculate it. I’m seeking advice from the experts here. I know this is against the rules. It can actually also be avoided. But I’m afraid of accidental operations.
After performing internal pressure calculations during equipment design, a negative pressure check should also be carried out; if both checks pass, then there is no problem. It cannot be simply stated that a device can withstand negative pressure just based on the maximum pressure it can handle.
I remember that pressure vessels are not designed to withstand negative pressure; if there is a need for such capability, it must be specified separately
Recalculate whether the device can withstand negative pressure based on its diameter, length, wall thickness, and material; do not proceed blindly.