What is the general emergency procedure when dealing with hydrogen?

The general emergency procedure when dealing with hydrogen emphasizes the importance of maintaining safety by ensuring that potential ignition sources are addressed. Keeping charged hoselines ready and ensuring the ignition is turned off is crucial in any scenario involving flammable gases like hydrogen. When hydrogen is present, any ignition source can lead to an explosion, so having hoselines prepared for immediate use allows for rapid response in case of fire. Turning off the ignition eliminates one of the primary risks associated with hydrogen, as it prevents additional fuel sources from being introduced into a potential fire scenario.

In the context of the other options, while maintaining a clear escape route and keeping a safe distance are certainly important safety practices, they do not specifically address the immediate actions required to mitigate the risks of fire or explosion when dealing with hydrogen. Using foam extinguishers is a valid method for certain situations, but it is not the sole focus in this context, as the primary concern is managing ignition sources and maintaining readiness for potential fire incidents.