Telescoping Tubing Extended with Air Pressure or Springs?

[Chris is me]

Originally Posted by Bill_B

And the difference to the structure (presuming it not to be soluble in the liquid) is what? That is, I know that liquids are sometimes used in the pressure testing of gas enclosures, but I do not know of any ratio or factor as a part of that testing. 120 psi is 120 psi regardless of the fluid. However, in the liquid's case the expansion of the fluid to reach zero psi is smaller. This makes a failure in the tested device somewhat less catastrophic and also mitigates the likely trajectories of fragments. Anyone involved in such testing to determine fracture points MUST take precautions that protect them from all possible failure modes.

Liquid isn't compressible.

The best precaution to take against preventing failure of a PVC system is to not use it for air. It's the only one, actually.

Regardless of any safety concerns, PVC is not a pneumatic component.