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HDRDR,
In the Aerospace Bus. we often used low pressure to test Aircraft for leaks the same way your Rig is going to be tested. If a higher pressure is used you have a potential for a bomb going off. Compressed air has a lot of what's refered to as stored energy.
My career ended up in Structural Testing for the Aircraft Engine Bus. in which I use a lot of methodology including Air pressure. Even 10 psi at that volume is something to be respected. It always amazed me to see air pressure treated lightly. I had to laugh one time I saw a sign on a compressed air tank that said "Do Not Hit With Hammer" I can't imangine someone out there doing that, but I guess there out there somewhere.
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