Steve is right about keeping at least SOME gas in a gas cylinder when it is in storage. If ambient pressure air (along with the moisture it carries) can get it, it will rust steel and oxidize aluminum. This could dramatically increase your chances of failing a hydro test.
Campers know (or should) that compressed gas cylinders (especially LP gas) are often barred from highway tunnels unless drained. How this would apply (if at all) to an HPA tank is something I don't know.
Trains in Japan classify gas cylinders as a "Hazardous Material" and they are therefore barred. Apparently, no provision is made for empty tanks.
In any event, should some catastrophy like a house fire occur, the pressure in the tank would indeed increase as the tank got hotter. Up to about 5000 psi, that is, at which point the high-pressure burst disk would fail and safely drain the tank. Any cigarette lighter or can of hair-spray presents a greater potential for personal injury in the event of a fire.
Campers know (or should) that compressed gas cylinders (especially LP gas) are often barred from highway tunnels unless drained. How this would apply (if at all) to an HPA tank is something I don't know.
Trains in Japan classify gas cylinders as a "Hazardous Material" and they are therefore barred. Apparently, no provision is made for empty tanks.
In any event, should some catastrophy like a house fire occur, the pressure in the tank would indeed increase as the tank got hotter. Up to about 5000 psi, that is, at which point the high-pressure burst disk would fail and safely drain the tank. Any cigarette lighter or can of hair-spray presents a greater potential for personal injury in the event of a fire.
