I know that diesel driven equipment on a gas installation have to have a special device that shuts off the air supply if the engine ingests gas. The engine (internal combustion) will overspeed due to the abundant supply of fuel, the normal governor won't work (it will try to adjust the diesel supply but that's not the source of the problem).
I assume a turbine engine is likely to suffer the same problem if it ingests gas, i.e uncontrolled overspeed.