Why are two fuel oil heaters "E" provided in the fuel oil system shown in the illustration? SG-0009
Official USCG Answer & Rule Citation
Correct Answer: Option C — To provide a backup in case one of the heaters becomes inoperable.
Redundancy is critical in marine propulsion systems. Dual fuel oil heaters allow one unit to be isolated for cleaning, maintenance, or internal tube failure while the operational standby heater maintains continuous fuel oil temperature control to the boilers.
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