Emergency Diesel Generator Preventive Maintenance
DIESEL GENERATOR OVERSPEED TRIP AND DAMAGE EVENT DESCRIPTION-
the governor which included removal of hydraulic fluid from the actuator system,
the engine oversped due to trapped air in the hydraulic actuator circuit of the governor.
CAUSE Air was not vented from the system following the refilling the governor with oil.
Procedure guidance was inadequate for the venting.
RESULTS AND POTENTIAL DAMAGE
The engine reached an estimated 620 RPM during the transient.
Normal operating speed is 450RPM and overspeed trip is 537.
Overspeed happened so rapidly that the reaction time of the fuelracks and the trip throttle valve (4-6 sec) was insufficient to prevent damage.
As a result,numerous engine components including connecting rod bushings, rod bearings, main bearings andthe engine base were damaged.
The potential for damage included personnel injury or death, and loss of emergency power if the overspeed had occurred during an actual emergency condition.
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