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Ship fuel is not fed straight into the main engine, as first of all the HFO (Heavy Fuel Oil) is pumped and then separated into a settling tank (buffer tank).

The settling tank is connected to the service tank (day tank). This service tank is filled via a continuous overflow from the settling tank and is also connected with the main engine. The oil is heated in both the settling and service tank to make sure that an even temperature of between +75°C and +90°C (or +167°F and +194°F) is maintained, as this keeps the heavy fuel oil (HFO) at a consistency that can be pumped easily.

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Q: What is the purpose of the settling tank in a fuel system and what happens in the tank?
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