[QUOTE=Snowman03782;37021]You say “numerous overspeed trips didnt work”???
Overspeed trips in general really dont need maintenance, they get tested. How in the hell would numerous trips all fail at once? I would buy into the idea that the mains overspeeds pushed their racks to zero but their intakes were pulling in the natural gas from the well.
Edit- I mean the governors tried to hit zero… overspeeds stop all the fuel, but the gas is feeding through the intake.[/QUOTE]
Testing of overspeed trips is in all preventive maintenance programs I’ve seen and there are also available CO2 injection systems and air shut offs to take care of an overspeed situation due to outside fuel sources. I would imagine the DH had at least one of those in place and if so they evidently didn’t work very well.