What is the pressure to which a propane tank should be filled during the purging process?

The pressure to which a propane tank should be filled during the purging process is ideally set at 15 PSI. This specific pressure is crucial because it ensures that the propane vapor can effectively displace any remaining air and moisture within the tank, allowing for a thorough purging process. Maintaining this pressure helps in preventing any potential safety hazards that could arise from an inadequate purging operation, such as improper combustion or the formation of explosive mixtures.

Moreover, the choice of 15 PSI aligns with industry standards and practices that prioritize safety and efficiency in handling propane. It provides a balance between adequate pressure for effective purging and safety considerations to prevent over-pressurization that could lead to other risks.

Other pressures listed, such as 5 PSI, 10 PSI, and 20 PSI, may not provide the same effectiveness or might introduce unnecessary risks if too high or too low. Thus, 15 PSI is recognized as the optimal pressure for performing the purging process safely and effectively.