On an fully automated vessel steaming at sea speed, which of the following engine room responses will automatically be actuated when the bridge throttle control is changed from full ahead to slow ahead?
• Fully automated bridge-controlled steam plant behavior when telegraph/throttle is moved from full ahead to slow ahead • How scoop injection works in a main condenser circulating system for a steam turbine plant • What happens to condensate flow and feedwater heating when load (shaft speed) is reduced
• When you reduce from full ahead to slow ahead, does the system need MORE or LESS steam flow to the turbine, and how would that affect any extraction valves? • Think about the condenser and scoop system: at higher vs lower speeds, is the scoop doing more work or less, and when would an injection valve need to open? • When load decreases, does the plant normally try to keep feedwater temperature high for efficiency, or immediately bypass feedwater heaters, and why would a condensate recirc valve be used in that situation?
• For each choice, ask: Is this a normal automatic response to a routine speed reduction, or is it more of an abnormal/limiting or protective response? • Consider which component directly responds to changes in main turbine steam flow and condenser vacuum conditions during speed changes. • Verify in your reference: Under automatic bridge control, which valves are designed to modulate condensate flow and maintain proper feedwater temperature and condenser level during load changes.
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