An oil fuel tank that contains only the required quality of fuel ready for immediate use. Two oil fuel service tanks, for each type of fuel used on board, necessary for propulsion and generator systems, are to be provided. Each tank is to have a capacity for at least eight hours operation, at sea, at maximum continuous rating of the propulsion plant and/or generating plant associated with that tank. The arrangement for oil fuel service tank is to be such that one tank can continue to supply oil fuel when the other is being cleaned or opened for repair (according to Lloyd’s Register).
Where main engine, auxiliary engines and boilers are operated on heavy fuel oil, the following equivalent arrangement may be accepted:
- One HFO Service Tank with a capacity of at least 8h at maximum continuous rating (MCR) of the propulsion plant and normal operating load at sea of the generator plant and the auxiliary boiler.
- One MDO Service Tank with a capacity at least 8h at MCR of the propulsion plant.
Where main engine and auxiliary boilers are operated on HFO and auxiliary engines are operated on MDO, the following equivalent arrangement may be accepted:
- One HFO Service Tank with a capacity at least 8h at MCR of the propulsion plant and normal operating load at sea of the auxiliary boiler.
- Two MDO Service Tanks, each with a capacity of at least the higher of: