Section 2 Installation of Propulsion Machinery, Fuel Oil Tank and Earthing

201. Installation of Propulsion Machinery

1. Propulsion machinery, except for those of small output, are to be installed on the bottom girders through the steel engine seatings of sufficient strength and rigidity.

2. Where machinery having large unbalanced inertia force or large unbalanced moment of inertia or subjected to large exciting force due to piston side thrust are installed, it is recommended that the steel engine seatings are of sufficient length for the engines and the engine seatings on both sides are connected each other or the engine seatings are of solid construction.

3. Where the temperature of the bed-plates for propulsion machinery or engine seatings in contact with the FRP girders may become the value to give bad influence on the creeping property of FRP in a normal operating condition, an effective insulation is to be provided between the bed-plates or seatings and FRP girders.

4. Considerations are to be given to installation of propulsion machinery or propulsion machinery seat- ings onto the FRP girders so that an excessive creep deformation does not occur due to the weights and clamping forces of bolts.

202. Fuel Oil Tanks 【See Guidance】

The surfaces of fuel oil tanks made of FRP facing the spaces such as main engine rooms, etc. where there may be usually heat of fire and to be provided with proper measures for flame re- tardation and flame-resistance. In case of engines using petrols, the fuel oil tanks are to be metallic.

203.

Earthing

1. Coverings of metallic structures, machinery and equipment in danger of electrification due to static electricity or electromagnetic induction, are to be effectively earthed, except where is no risk of persons to touch them directly.

2. Metallic fuel oil tanks and pipes are to be effectively earthed. Where FRP fuel oil tanks are used, the metallic parts of valves, manhole covers, etc. fitted up in the tanks and the fuel oil pipes are to be electrically connected effectively, and they are to be earthed.