Quote:
Originally Posted by Al Skierkiewicz
Storage at anything greater than one atmosphere at your event location would be considered pneumatic. You can only pressurize the pneumatics system with a single legal compressor.
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Although valid under most circumstances, I don't think that's a rigourously true statement. After all, there exist exceptions for pneumatic tires (including presumably their tubes) and gas-filled shock absorbers. The rules aren't clear if these are intended to be the only possible exceptions (among pressurized components), nor whether pneumatic constraints are intended to encompass anything containing any compressed gas.
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And as was pointed out above, an ordinary sealed helium balloon is not providing energy, so the energy source rule does not apply. And the compressed air source rule doesn't apply because it's not compressed air!
This is definitely a good candidate for the Q&A. If they disapprove of it, I'll be curious to see the grounds for their decision.
1 I don't think anyone wants to subject the batteries to the pneumatics rules, just because they can exceed one atmosphere due to hydrogen generation. (And it's not exactly negligibly in excess of 1 atm, given that they're engineered with overpressure vents.)