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Emergency diesel shutdown
Gould 0738 wrote:
A paragraph in a book I've been sent to review seems to be in error. Either that, or I'm not properly intuitice about this situation. The paragraph poses a mulitple choice question. "What is the best way to shut down a runaway diesel engine?" One choice is a throw-away. "Cut off the electrical supply." Bzzzt! "Thanks for playing, and we do have some lovely parting gifts for you........" The other two choices: 1. Cut off the fuel supply 2. Cut off the air supply I immediately thought, "the fuel supply. You shut down a diesel by cutting off the fuel." According to the author, the correct answer is supposed to be "Cut off the air supply." The author recommends "discharging a fire extinguisher into the air intake." Well, first off it would need to be the correct type of fire extinguisher. Some extinguishers are charged with halon (which is no longer legal to mfg in the US but is imported or recycled from other extinguishers) and a diesel will run like crazy on halon. And, I'm aware of emergency shut downs that have been accomplished with CO2 extinguishers, etc. I just thought those were cases where it was impractical to cut off the fuel supply. Wouldn't putting a postive stop to the fuel supply from the injector pump be a more certain solution? "Some" air might get sucked into the air intake along with the fire suppressant, maybe enough to allow the engine to cough past the extinguisher discharge and keep running. But, the engine absolutely will not run without fuel. Shutting off the fuel very far upstream wouldn't be a good choice, as an engine can run quite a while on the fuel in lines, filters, etc. Somebody care to agree, disagree, or show me why my preference for fuel shut down would be wrong? Shut off the fuel supply, block the air intake and keep a load on the engine. You sure as hell don't want to pump CO2 down the airpipe. -- Email sent to is never read. |
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