Alarm Flood and Fatigue on an Unmanned Night Watch
Your 3,200 GT chemical tanker is operating unattended machinery space at night on passage in the Caspian. At 0200 the duty engineer, who has already worked 14 hours that day because of a delayed bunkering and cargo-line repair, is alone in the engine room. The alarm system records 13 alarms in 10 minutes: bilge high level, fuel oil leak in the purifier room, exhaust gas temperature deviation on No. 2 unit, purifier vibration, and several repeated low-pressure alarms. The dead-man alarm has been bypassed with a wire because it kept activating due to a loose connection. The duty engineer acknowledges the alarms remotely from the control room and returns to the workshop to finish a repair. The chief engineer reviews the alarm history the next morning.
1. What immediate risks do you identify, and what actions should the chief engineer take before the ship continues on passage?
Read the worked answer
The alarm flood is itself a hazard. Thirteen alarms in ten minutes means the duty engineer cannot investigate each one, and the fuel oil leak and purifier vibration are potentially serious. A fuel leak near a hot surface can start a machinery-space fire, while high bilge level may indicate a leak, flooding, or a failed pump. The exhaust temperature deviation suggests a fuel or combustion problem. The bypassed dead-man alarm removes the system's ability to detect an incapacitated watchkeeper.
The chief engineer should attend immediately and take control. Actions:
- Muster a second engineer or ETO to assist; no one should investigate a possible fuel leak alone.
- Stop and isolate the purifier, close the fuel supply, and inspect the purifier room for leakage and hot surfaces.
- Check the bilge level and bilge pump; identify the source of water before pumping overboard.
- Investigate No. 2 unit exhaust temperature and reduce load if necessary.
- Restore the dead-man alarm only after repairing the loose connection; do not leave the wire in place.
- Put the machinery space on a manned watch until all alarms are cleared and the cause of the alarm flood is understood.
- Inform the master and consider whether the ship should reduce speed or stop.
2. How should the chief engineer address the fatigue and watchkeeping failures without reducing the safety culture to blame?
Read the worked answer
The chief engineer must separate the immediate safety fix from the management review. The duty engineer should not be simply blamed for bypassing the dead-man alarm; the underlying issue is a schedule that placed a single watchkeeper on duty after 14 hours of work, with a known defective alarm circuit and no supervision.
Under the Maritime Labour Convention, seafarers are entitled to minimum rest: at least 10 hours in any 24-hour period and 77 hours in any 7-day period. A 14-hour working day followed by a night watch is a fatigue risk. The chief engineer should review the rest-hour records, the bunkering and repair schedule, and the manning matrix. If the ship cannot maintain UMS operation safely, the company must authorize additional watchkeeping or a manned engine room.
Corrective actions:
- Repair the dead-man alarm and test it.
- Review alarm management: reduce nuisance alarms, set priorities, and ensure critical alarms are not buried.
- Require two-person attendance for fuel-leak and fire alarms.
- Replan maintenance and bunkering so that the duty engineer is not on watch immediately after heavy work.
- Conduct a fatigue and UMS drill.
- Report the near miss through the safety management system and discuss it as a learning event, not a disciplinary hearing, unless deliberate negligence is proven.
3. What should be recorded and communicated to the master and company?
Read the worked answer
Record the factual sequence: time of each alarm, alarm text, acknowledgement time, actions taken, load and speed, and the time the dead-man alarm was found bypassed. Preserve the alarm printout or electronic log before resetting it. Record the duty engineer's hours of work and rest for the previous 72 hours, the bunkering and repair times, and the manning level.
Inform the master immediately of the fuel leak, the bypassed safety device, and the decision to man the engine room. The master should be asked whether the voyage plan needs adjustment and whether the company should be contacted. Report to the company and the designated person ashore as a near miss and a safety-management non-conformity. If the dead-man alarm or UMS system is a statutory requirement, record the defect and the compensatory measures in the official log and maintenance system.
Communication with the duty engineer should be direct but fair: explain why the bypass was unsafe, listen to the reason, and confirm that the repair will be done. The company should receive a corrective-action plan with responsible persons and deadlines. At the next safety meeting, share the lessons without personal identification, focusing on fatigue, alarm prioritization, and the danger of defeating safety devices.