What is a necessary component for personnel dispensing propane gas?

The necessary component for personnel dispensing propane gas is the inclusion of ethyl mercaptan. Ethyl mercaptan is an odorant added to propane because propane itself is colorless and odorless. This odorization is crucial for safety, as it allows individuals to detect gas leaks through smell. If a propane leak occurs, the strong odor of ethyl mercaptan can alert personnel and the public to the potential danger, prompting immediate action to resolve the situation and prevent accidents such as fires or explosions.

While other elements like specific permits, additional training, and protective equipment are important for safely handling propane, they do not serve the same immediate safety purpose as ethyl mercaptan does in detecting gas. The presence of ethyl mercaptan is a key requirement for ensuring that propane gas is dispensed safely, making it essential for personnel in this role.