Regulations for Fuel and Lub Oil Systems for M/E: Regulation Requirement Series

Regulation Requirement Series

"Fuel/Lub Systems for Marine Engines"

2.6 Systems

2.6.1 General

• Flexible hoses in the fuel and lubricating oil system are to be limited to the minimum and are to be type approved.
• Propulsion engines are to be equipped with external connections for standby pumps for:

1. fuel oil supply
2. lubricating oil 
3. cooling water circulation.

2.6.2 Fuel oil system 

• Relief valves discharging back to the suction of the pumps or other equivalent means are to be fitted on the delivery side of the pumps. 
• In fuel oil systems for propulsion machinery, filters are to be fitted and arranged so that an uninterrupted supply of filtered fuel oil is ensured during cleaning operations of the filter equipment.
• All external high pressure fuel delivery lines between the high pressure fuel pumps and fuel injectors are to be protected with a shielded piping system capable of containing fuel from a high pressure line failure.
• A shielded pipe incorporates an outer pipe into which the high pressure fuel pipe is placed forming a permanent assembly.
• The shielded piping system is to include a means for collection of leakages and arrangements are to be provided for an alarm to be given in the event of a fuel line failure.
• When in fuel oil return piping the pulsation of pressure with peak to peak values exceeds 2 MPa, shielding of this piping is also required as above.

2.6.3 Lubricating oil system

• In lubricating oil systems for propulsion machinery, filters are to be arranged so that an uninterrupted supply of filtered lubricating oil is ensured during cleaning operations of the filter equipment.
• Relief valves discharging back to the suction of the pumps or other equivalent means are to be fitted on the delivery side of the pumps. 
• Where necessary, the lubricating oil is to be cooled by means of suitable coolers.