Propulsion loss is not merely a technical failure. In restricted waters, it becomes a strategic risk with severe operational and financial consequences.
The guidance paper “Reducing the Risk of Propulsion Loss” a-bilbroughcom-profiles-ms_prof… provides structured operational advice to prevent blackouts and main engine failures, aligned with SOLAS and ISM requirements.
Why Propulsion Loss Is a Critical Exposure
A blackout in open sea is manageable.
A blackout during harbour manoeuvring may trigger collision, grounding or major pollution exposure.
Potential consequences include:
- Collision and contact claims
- Groundings
- Extended off-hire
- Salvage and towing costs
- Reputational damage
The financial outcome depends largely on vessel location at the time of failure.
Main Causes Identified in P&I Investigations
Recurring patterns include:
Fuel-related issues
- Contamination (water, bacteria, fines)
- Improper SECA changeover procedures
- Blocked filters
- Fuel starvation
Human factors
- Inadequate monitoring of starting air pressure
- Incorrect load sharing management
- Failure to follow SMS procedures
Electrical failures
- Generator overload
- AVR malfunction
- Preferential trip system issues
Poor maintenance
- Neglected pneumatic control systems
- Lubrication failures
- Untested emergency generator batteries
Human error and insufficient maintenance remain leading contributors.
SOLAS and the Emergency Generator
Under SOLAS Chapter II-1:
- Automatic start within 45 seconds
- Capability to restore propulsion within 30 minutes (post-1998 vessels)
- Protected stored starting energy
The emergency generator supplies critical services only — steering gear, fire pumps, control systems — not the entire ship.
Weekly testing under realistic conditions is essential.
Load Shedding and Preferential Tripping
Automatic load shedding must:
- Protect generators from sustained overload
- Exclude primary essential services
- Shed non-essential loads in stages
Crew awareness of load hierarchy is vital to prevent cascading failure.
Recovery After Blackout
Operational priorities include:
- Immediate bridge–engine room communication
- Manual auxiliary generator start if required
- Restoration of lubrication and cooling systems
- Progressive reconnection of essential loads
All procedures must be embedded within the vessel’s SMS.
ISM Code and Root Cause Analysis
Every propulsion loss event requires:
- Formal investigation
- Root cause identification
- Corrective action implementation
- Periodic testing of critical systems
Many major casualties are preceded by ignored minor incidents.
Final Consideration
Propulsion loss is rarely random.
It is usually the predictable outcome of inadequate maintenance discipline or procedural weakness.
Are your critical systems tested under stress conditions — or only assumed to work?
Source & Reference
Organization: The London P&I Club – TMC Marine – Bureau Veritas
Title: Reducing the Risk of Propulsion Loss – Operational guidance for preventing blackouts and main engine failures
Link: https://www.londonpandi.com/knowledge/publications/
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