Section 5 Fuel Oil System

501. Arrangement of fuel oil tanks

1. Fuel oil tanks for emergency diesel engines are to be located on or above the weather deck outside the engine housing or compartment and as close to the engine as practicable.

2. The fuel oil tanks are preferably to be part of the craft's structure and are to be located (except for double bottom tanks) outside fire hazard area.

3. For craft constructed of FRP or aluminium alloy, fuel oil tanks being constructed of same material are not to be installed in fire hazard area, nor to form part of the boundary to such spaces. But, fuel oil tanks with A-60 class insulation may be installed in fire hazard area.

4. Daily service tanks of steel or equivalent material may be permitted in fire hazard areas. All pipes connected to such tanks below the highest tank liquid level are to be arranged with remote quick- closing valves.

502. Piping conveying fuel or other flammable fluids

1. Piping conveying fuel or other flammable fluids are not to pass through passenger, cargo and crew compartments. Flexible fuel oil pipes are to be suitable for service conditions and are not to pene- trate watertight bulkheads.

2. All fuel or other flammable liquid piping leading into fire hazard area are to be arranged with shut- off valves located outside the fire hazard area and easily to be accessible.

503. Fuel oil filters and pumps

1. The fuel oil pipes of the main engine and essential auxiliary engines are to be provided with filters which can be cleaned without interruption to the fuel oil supply.

2. Where two or more main engines operating respectively are provided, and where it is possible to give a navigable speed even if one of the engines is out of order the duplex filters may be omitted.

3. Where two or more main engines operating respectively are provided, and where it is possible to give a navigable speed even if one of the engines attached with their own fuel oil pumps is out of order, the stand-by fuel oil pumps may be omitted.