Main Engine Fuel Pump Seizure on Passage
Your 14,000 TEU container ship is on passage across the North Pacific, 36 hours from the nearest port. The main engine is a MAN B&W 9G95ME-C two-stroke, running at 85% MCR. The chief engineer is ashore on medical leave and you are the senior engineer on watch. At 0240 the engine room alarm sounds: No.3 unit fuel pump plunger is stuck, fuel delivery is erratic, and the exhaust gas temperature on No.3 cylinder has risen 60°C above the average of the other eight units. The engine room is manned only by you and one motorman. The bridge has been informed and the master has asked for your assessment. The vessel is carrying a full deck load and heavy weather is forecast in 18 hours.
1. What is your immediate priority and what actions do you take in the first 15 minutes?
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Priority: protect the engine and crew, then restore safe propulsion.
Reduce load immediately. Inform the bridge and reduce main engine revolutions to about 60% MCR to lower thermal loading on No.3 cylinder while keeping steerage way. Do not stop the engine at sea unless there is no alternative.
Confirm the diagnosis. Check the fuel pump index, the exhaust gas temperature trend, and the fuel oil pressure. A stuck plunger with erratic delivery plus a 60°C exhaust temperature rise points to a seized or partially seized plunger, or a broken spring. Check for fuel leakage and fire risk around the pump.
Cut out the affected unit. On this engine the fuel pump can be isolated by lifting the roller guide or by shutting the fuel supply to that unit. Follow the maker's instructions exactly. A running engine on eight cylinders is acceptable for a limited period, but unbalanced firing and torsional vibration must be monitored.
Record and report. Log all actions, times, and readings. Inform the master of the situation, the reduced speed, and the estimated time to a safe port. Do not attempt a repair at sea that requires dismantling the pump unless conditions and manpower allow.
Plan the repair. The pump must be removed and inspected at the next port. Meanwhile monitor all cylinder exhaust gas temperatures, turbocharger speed, and vibration every 30 minutes.
2. Heavy weather is forecast in 18 hours. How does this change your plan?
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Heavy weather raises the risk of further damage and makes at-sea repair unsafe.
- Speed and course. With one unit cut out, the engine is already unbalanced. In heavy weather, propeller racing and governor action will impose additional cyclic loads. Reduce to a safe economical speed and consider altering course to avoid the worst of the weather, in consultation with the master.
- Securing for sea. Ensure all loose gear in the engine room is secured. Check that the fuel pump isolation is positively locked and cannot vibrate back into service. Check sea water and lubricating oil systems for security.
- Manning. You have one motorman. Set a watchkeeping pattern that ensures the engine room is never left unattended while the engine is on reduced cylinders. Inform the master that you cannot guarantee a repair in heavy weather.
- Contingency. Prepare the emergency generator and steering gear for immediate use. Brief the bridge on the reduced manoeuvring capability. If the weather deteriorates further, consider seeking shelter or reducing to dead slow ahead.
- Decision point. If the engine cannot be kept running safely, the master must be advised so that he can decide whether to proceed to the nearest port of refuge.