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[dextrous]

Originally Posted by Anonymous Coward

But if you only fill it 3/4 and then inject a tiny bit of HPA the tank will rapidly warm up. One of the fields I attended did this to bottles.

That sounds like a Bad headline waiting to happen. One stuck reg or fat finger on the controls and you could easily blow something up. Burst disks work well for overfilled or over pressurized tanks. But a supercooled liquid rapidly expanding due to the addition of a compression-heated gas could result in an extreme pressure spike, possibly leading to a catastrophic tank failure.

If i saw someone hooking my CO2 tank up to a HPA set-up i'd tell them no thank you.