Podcast
Questions and Answers
What was the primary cause of the engine failure on the offshore supply vessel?
What was the primary cause of the engine failure on the offshore supply vessel?
- A mechanical failure in the no. 3 main diesel generator engine. (correct)
- The crew's negligence in not properly inspecting the engine after maintenance.
- A failure of the automatic power management system during sea trials.
- A fire in the engine room caused by a faulty engine component.
What was the crucial error made during the maintenance period that ultimately led to the engine failure?
What was the crucial error made during the maintenance period that ultimately led to the engine failure?
- The failure to replace the connecting rod bearings with machined bearings.
- The lack of proper documentation of the main bearing's part number.
- The decision to replace the bearings with new ones instead of reusing the old ones.
- The use of standard-sized bearings to replace the undersized no. 6 main bearing. (correct)
What was the likely reason for the service technicians not discovering the discrepancy in the no. 6 main bearing's size?
What was the likely reason for the service technicians not discovering the discrepancy in the no. 6 main bearing's size?
- The technicians did not have the proper tools to accurately measure the bearing size.
- The undersized bearing was not readily visible during inspection.
- The technicians assumed all bearings were standard size after replacing the connecting rod bearings. (correct)
- The technicians were rushed and did not adequately inspect all the bearings.
What was the purpose of the sea trials conducted after the maintenance period?
What was the purpose of the sea trials conducted after the maintenance period?
What is the significance of the IMCA SF 24/24 reference in the Safety Flash?
What is the significance of the IMCA SF 24/24 reference in the Safety Flash?
Flashcards
NTSB
NTSB
National Transportation Safety Board, a U.S. agency overseeing transportation safety.
Diesel generator failure
Diesel generator failure
A malfunction in a diesel engine that can cause operational hazards like fire.
Mechanical failure
Mechanical failure
A breakdown of machinery leading to operational issues, often severe.
Connecting rod bearing
Connecting rod bearing
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Maintenance oversight
Maintenance oversight
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Study Notes
Diesel Generator Engine Failure
- A vessel conducting sea trials experienced a mechanical failure in its no. 3 main diesel generator engine, resulting in a fire in the engine room.
- The fire was extinguished, but the damage to the vessel was approximately $1.1 million.
- Technicians replaced connecting rod bearings with standard-sized ones during maintenance, but one bearing was undersized.
- The undersized bearing led to a catastrophic failure of the no. 3 main engine.
Cause of Failure
- The undersized no. 6 main bearing allowed lube oil to leak, decreasing oil supply to adjacent connecting rod bearings.
- This resulted in a rapid increase in temperature and fractured bearing cap bolts.
- Subsequent components broke loose, damaging the crankcase and allowing hot oil/gas to ignite a fire.
- Incorrectly identified part number of removed bearing led to the use of an incorrect replacement, resulting in failure.
Maintenance Lessons Learned
- Proper identification of components removed during maintenance is crucial.
- Recording part numbers of all removed components is essential to ensure correct replacements.
- Tracking systems for equipment components can ensure proper replacements during maintenance.
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