A recovery cylinder that is half full of recovered R-22 at about 75 °F, in the absence of non-condensables, will be pressurized to approximately how many psi?

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Multiple Choice

A recovery cylinder that is half full of recovered R-22 at about 75 °F, in the absence of non-condensables, will be pressurized to approximately how many psi?

In a closed container with a pure refrigerant that has both liquid and vapor, the pressure is determined by the saturated vapor pressure at the container’s temperature. The liquid and vapor are in equilibrium, so the cylinder pressure sits at the saturation pressure for that temperature. When the cylinder is at about 75 °F and contains R-22 with no non-condensables, the pressure will match the saturated vapor pressure of R-22 at 75 °F, which is roughly 130 psig. The absence of non-condensables means the pressure isn’t raised by other gases, so the value reflects the pure R-22 saturation pressure at that temperature.

In a closed container with a pure refrigerant that has both liquid and vapor, the pressure is determined by the saturated vapor pressure at the container’s temperature. The liquid and vapor are in equilibrium, so the cylinder pressure sits at the saturation pressure for that temperature. When the cylinder is at about 75 °F and contains R-22 with no non-condensables, the pressure will match the saturated vapor pressure of R-22 at 75 °F, which is roughly 130 psig. The absence of non-condensables means the pressure isn’t raised by other gases, so the value reflects the pure R-22 saturation pressure at that temperature.

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