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Only down to the vapor pressure of the saturated liquid vapor.

But isnt the whole point of heating your propane to get a higher pressure then the vapor pressure belonging to the environmental temperature?

psycix wrote:

Only down to the vapor pressure of the saturated liquid vapor.

But isnt the whole point of heating your propane to get a higher pressure then the vapor pressure belonging to the environmental temperature?

The whole point in heating propane is it is a refrigerant. As you use large volumes, the tank quickly cools, even to forming frost. As it cools, the pressure drops off. The point of heating propane is to keep it near ambient to keep the pressure up after the first shot.

Technician1002 wrote: The whole point in heating propane is it is a refrigerant. As you use large volumes, the tank quickly cools, even to forming frost. As it cools, the pressure drops off. The point of heating propane is to keep it near ambient to keep the pressure up after the first shot.

All liquids are refrigerants.

The "heating" part might be a bit misleading to someone that doesn't quite understand what they are trying to accomplish. You're just trying to keep the propane tank near ambient temperature. Any large thermal mass will work, like dropping the tank in a bucket of water. An actual heater could be used as long as care is taken to keep the tank from being heated too hot. Either a fairly low power heater, or a higher powered one controlled by a thermostat, will work.