While standing your engine room watch at sea, you notice the D.C. heater level is dropping below normal as indicated by the remote level indicator. The boiler drum level is observed to be normal, as is the main condensate pump discharge pressure. Therefore, you should __________.
• D.C. heater (dearator/deaerating condenser) function in the feedwater/condensate cycle • Relationship between boiler drum level, condensate pump discharge pressure, and D.C. heater level • Purpose and effect of a make‑up feed bypass valve in maintaining system inventory
• If boiler drum level and condensate pump discharge pressure are normal, what does a falling D.C. heater level suggest about overall system water inventory? • Which action changes total water in the feed system versus only changing how fast water circulates or how much steam is generated? • What is the risk of changing firing rate or feedwater set point when the boiler level already appears normal?
• Confirm that boiler drum level is already normal—would increasing or decreasing firing rate safely correct a low D.C. heater level? • Consider which option directly adds water to the system versus just changing operating conditions. • Verify the intended use of the make‑up feed bypass valve in your plant diagrams or training materials.
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