AUS-MED-L4.3

When it goes wrong - fire, flooding and loss of propulsion

Three casualties account for almost everything that will genuinely threaten a small commercial vessel: fire, flooding, and loss of propulsion. They share one rule, which comes at the end of this lesson and is the most important sentence in it.

Entry & progression

On a small vessel, you are the engineering department. There is no second engineer to consult and no shore team on the phone. What you do in the first sixty seconds decides most of what happens next.

Fire

Fire classes and the right agent

Engine room fire

  1. Raise the alarm. Before you fight it. Not after.
  2. Stop the fuel. The remote fuel shutoff exists for exactly this. A fire being fed by a pressurised fuel line is not a fire you win with an extinguisher.
  3. Stop the ventilation. Close the flaps and dampers. Fire needs air, and the fans are supplying it.
  4. Attempt it with a portable extinguisher only if it is small and you have a clear escape route behind you. If it is not small, or the route is not clear, get out.
  5. Evacuate and account for everyone. Every soul, by name.
  6. Seal the space and release the fixed system. Then leave it sealed - opening it to look feeds it fresh air and it will re-ignite.

Flooding

Water is heavy and it does not stop coming. The order is find it, stop it, pump it - in that order. Pumping a hole you have not found is a race you will lose, and it is surprisingly easy to spend ten minutes pumping while the water rises anyway.

  • Find it. Where is the water coming in? Skin fittings, the stern gland, a failed hose on a seacock, the raw water system, a hull breach after a grounding.
  • Stop it. Close the seacock. If it is a hose failure, that alone may stop it entirely. Softwood plugs are tied to every seacock on a well-run vessel for a reason.
  • Pump it. Bilge pumps, emergency bilge suction, portable pump, buckets. All of them.
  • Tell the bridge. Flooding is a stability problem, not just an engineering one. Free surface water sloshing across a compartment reduces stability fast, and the master cannot account for that if they do not know.

Loss of propulsion

The engine has stopped, or has had to be stopped. On a small vessel that means you are drifting, and the first question is not mechanical - it is where are we drifting to, and how long have we got? That is the bridge's question, and they can only answer it if you tell them at once.

Symptom Look at first
Stopped, will not restart Fuel. Filters, air in the line, tank level, a bug-blocked primary in a seaway.
Stopped with an alarm Whatever the alarm said. Oil pressure and overheat are the two that stop an engine and must not be reset and ignored.
Running, no drive Gearbox, gearbox oil, coupling, shaft. Or something around the propeller.
Running, but rough / down on power Fuel starvation, a fouled propeller, or a rope around the shaft.

CAUTION — The alarm that stopped the engine was right The instinct under pressure - drifting, on a lee shore, with the master asking - is to restart and run on. If the engine stopped on low oil pressure or on overheat, restarting it converts a stopped engine into a destroyed one, and you will be drifting anyway, with no engine at all.

Tell the bridge what the alarm was and what restarting will cost. Let the master make that decision with the facts. It may still be the right call - but it is their call, and it must be an informed one.

The one rule

All three are a bridge problem before they are an engineering problem. Tell the master first. The instinct is to put your head down and fix it, and report once you have something useful to say. Fight it for the ten seconds it takes to pick up the phone. The master cannot navigate, call for assistance or alter course for a vessel they believe is fine.

You are not being judged on whether you fixed it alone. You are being judged on whether the vessel and everyone on it came home.

Practice questions

5 questions
recallcore

recall · core

The correct order of response to flooding is: (a) Find it, stop it, pump it (b) Pump it, find it, stop it (c) Stop the engines, then pump (d) Seal the compartment and evacuate

recallcore

recall · core

In an engine room fire, before attempting to fight it you should: (a) Increase ventilation to clear the smoke (b) Raise the alarm, stop the fuel and stop the ventilation (c) Open the space to assess the seat of the fire (d) Start the main engine to power the fire pump

recallcore

recall · core

An engine has shut down on a low oil pressure alarm and the vessel is drifting. Restarting it: (a) Is standard practice once the alarm is reset (b) Is safe provided the load is kept low (c) Risks destroying the engine, and is the master's informed decision, not a reflex (d) Will clear the fault

recallcore

recall · core

Once a fixed extinguishing system has been released into a sealed engine room, the space should be: (a) Opened after five minutes to confirm the fire is out (b) Ventilated to clear the agent (c) Entered by one person with breathing apparatus (d) Left sealed - opening it feeds the fire fresh air and it will re-ignite

recallcore

recall · core

What fire, flooding and loss of propulsion all have in common is that: (a) They are all caused by poor maintenance (b) They can all be resolved by the engineer without assistance (c) They all require the fixed fire system (d) They are all a bridge problem before they are an engineering one - tell the master first

AI-drafted catalogue content pending SME review. Sea service and course requirements change; verify with AMSA before relying on this for a career decision.

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