What must a separate device protect the system from?

A separate device must protect the system from vacuum and backpressure to ensure the safe and reliable operation of gas piping systems. When gas systems experience vacuum conditions, there is the potential for contaminants or unwanted atmospheric air to enter the piping, leading to dangerous situations, such as the risk of combustion if the mixture becomes flammable. Backpressure, on the other hand, can cause dangerous situations where gas is forced back into the service or storage areas, which could result in leaks or ruptures in the piping.

In gas piping systems, protection against these conditions is crucial for maintaining system integrity, ensuring that the gas flows correctly, and preventing unintentional exposure or accidents. This makes a protective device that specifically addresses vacuum and backpressure essential for maintaining the safety and efficiency of gas delivery systems.