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The purpose of this procedure is to provide guidance on the minimum continuous running speeds of the main engine.
Chief Engineer shall:
• Advise the Master of minimum safe continuous running speed of the main engine.
• Inform engineering staff of operating conditions.
Duty Engineer shall:
• Monitoring main engine running parameters.
• Ensure that engine power is above minimum setting.
The minimum permissible engine load for engines when running on high viscosity fuel is generally restricted to 35 to 50% of MCR to prevent possible engine damage caused by incomplete combustion. Engine maker’s instructions in the Instruction Manual should always be followed. At all times operation at critical revolution zone is to be avoided. There is may be more than one critical zone in the service revolution range.
If ME operation at economic speed/slow speed is required for a long period of time an excess of cylinder oil may accumulate in the exhaust gas manifold that could cause an explosion when normal steaming is resumed. It is recommended that the feed rate be adjusted by changing the position of the lubricator drive lever rather than altering the adjustment screws. This avoids complications in readjusting when the vessel returns to normal speed. For low load operation is for an extended period of time it is recommended for a gradual return to normal operating maximum rpm for ONE hour every day to keep combustion spaces clean. During this time carry out T/C grit washing followed by soot blow of the economiser. The exhaust temperature at the economizer outlet should always be kept above 130 degrees to prevent acid corrosion.

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