Question 461Steam Plants - Assistant Engineer70% to pass
A turbine-driven centrifugal feed pump used for boiler feed service should normally be stopped by _______________.
AI Explanation
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.
Related Questions
#459 The boiler fuel oil service pump normally takes suction from the _______________.#460 If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur? #462 The main boiler feed pump discharge is controlled by the admission of steam to the auxiliary turbine. The admission of steam is normally regulated by a _______________.#463 To prevent pulsations from developing in the boiler feed water lines, the discharge side of a reciprocating feed pump is equipped with a/an _______________.#464 During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed?