When monitoring a heavy fuel oil treatment plant, what would be an indication that the treatment plant throughput volume is less than the main engine consumption?
• Function of the HFO settling tank vs. HFO day tank in a fuel system • Normal flow path of heavy fuel oil from bunkers to engine (including treatment plant) • What happens to tank levels when inflow is less than outflow
• Trace the fuel path: From which tank does the main engine actually draw fuel, and which tank supplies that tank? • If the treatment plant is processing less fuel than the engine is burning, which tank’s level would you expect to change first, and in what direction? • Think about overflow arrangements: In normal operation, which tank is designed to overflow into which, if any?
• Identify clearly which tank is the immediate supply to the main engine (day tank or settling tank). • Confirm the direction of overflow between the settling tank and day tank on a typical system. • Check which tank level would show a continuous (not temporary) change if consumption stays higher than treatment throughput.
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