Question 461Steam Plants - Assistant Engineer

The correct answer is D) hand activating the over speed trip. The over speed trip is a safety mechanism designed to automatically shut down the turbine-driven centrifugal feed pump if it exceeds a pre-set speed limit. This is the proper way to stop the pump, as it prevents damage to the pump and the boiler system in the event of a malfunction or runaway condition. The other options are not recommended, as they do not provide the same level of safety and protection. Closing the steam via the excess pressure pump governor (A) or slowly closing the manual throttle (C) may not be enough to stop the pump in an emergency situation. Opening the recirculating valve and manually closing the throttle (B) could be a slower and less reliable method compared to the over speed trip.