I haven’t seen a mention so far, but 30 bar pressure isn’t that big. Scuba diving uses helium (wellC helium and oxygen) at up to 250 bar (in small cylinders, 10

I haven’t seen a mention so far, but 30 bar pressure isn’t that big. Scuba diving uses helium (wellC helium and oxygen) at up to 250 bar (in small cylinders, 10-12liters) with no issue whatsoever. The cylinders aren’t even that big or heavy (for a heat pump).