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Message: <blockquote data-quote="dennishoddy" data-source="post: 4343893" data-attributes="member: 5412">We used hydrogen to cool the generators in our 1100-megawatt system. It's very dangerous in a way, but easy to detect.If we got a leak in our instrumentation or one of the seals on the generator, it would instantly ignite.Hydrogen doesn't need an ignition source, just atmospheric pressure to make a flame.It has to remain under pressure to be safe.We would open a door in an instrument cabinet that monitored hydrogen pressures to do some testing. If a small flame was present, we knew the fitting was leaking.Conversely, if it were natural gas or methane, etc, the concentration would build up until an explosion would occur with outside ignition.</blockquote>