I am going to have to disagree with you on that to a point.
PSI is the same with pneumatic versus hydraulic. 100psi is the same weather you have water pressure or air pressure.
I will agree that pneumatic will have a much more violent burst than hydraulic.
pneumatic psi will find leaks easier than hydraulic psi.
Hydraulic will gain pressure due to hydrostatic weight and pneumatic will not.
I would never use pvc for air lines. I would not use pex for airlines with plastic connectors.
I would not use rapid air system with plastic connectors.
Rapid air stuff seems to be a pretty good system but I feel it is just a marketed pex set up.
I would use pex or rapid air with brass or copper connectors.
The first two shops I plumbed for air were done in copper and I had zero issues other than quick connects for well over 10 years at each shop. Both shops were industrial 24/7 businesses.
This is my preferred method but now days, copper is very, very expensive.
Rapid air has great stuff and is very user friendly. I feel that they have built there product line off of the pex system and that is a great system. (do not use plastic connectors)
I already have the tools to do pex and my shop is pretty large 80x65 so I have a lot of air lines.
I saved a lot building my own system using pex with copper drops in areas that would see heavy use or welding.
If somebody had a smaller shop and did not already have the tools to sweat copper and crimp pex, The rapid air could be the cheaper option.
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