Diesel Backup Generator
All critical facilities are usually set up with fault tolerant systems. This goes naturally for emergency power for electricity as well. Most common is to use diesel backup generators. This is a setup with a diesel engine giving power to run a generator that produce the needed electrical power in case of a failure of the public mains supply.
These diesel backup generators are often placed close to or within the facilities to be powered. Leaks from fuel might be critical and potential dangerous if not known and taken care of.
Typical application areas are; computer centers and data rooms, hospitals, defense related installations, police hubs, power plants, power distributors, transportation related industries, broadcasting companies etc.