Regarding the equipment getting deflated
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Ordinary equipment can withstand pressures of several dozen kilograms, but why do some devices get collapsed under such pressure? If it’s a matter of design, then why not design them to be able to withstand extreme negative pressures as well?
The internal pressure and the external pressure are different. Internal pressure causes failure in strength or stiffness, while external pressure generally leads to instability. Being deflated means being in the back. A container that can withstand internal pressures of several atmospheres may not necessarily be able to withstand a vacuum.
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Generally, the containers that get flattened are those under normal pressure, with a large volume and thin walls; they may get flattened if the breathing valve fails or if gas escapes too quickly.
It is not a negative-pressure device, and it is prone to external pressure-induced instability.
Just like mineral water bottles, they are generally hard to blow up but easy to deflate
Just like mineral water bottles, they are generally hard to blow up but easy to deflate
Whether to consider the possibility of negative pressure in the equipment should be determined by the process; meanwhile, taking such a scenario into account would require increasing the thickness of the equipment or adding external reinforcement rings, which raises the manufacturing costs.