NIMASA STCW FPFF common mistakes
NIMASA STCW FPFF · Understand the traps and how to avoid them.
When asked which extinguisher to use on a galley deep-fat fryer fire, the candidate picks a dry powder or water extinguisher and then describes spraying the jet directly into the oil, rather than choosing a wet chemical extinguisher and applying it gently to the surface.
Candidates memorise 'Class F = wet chemical' but never connect it to the physics: a high-pressure jet or cold water causes the hot oil to erupt and spread burning fat, and dry powder does not saponify the surface. The exam phrases the question as a scenario, so the candidate answers with the class letter only and ignores the application method.
What to do instead
Learn the Class F answer as a pair: medium plus technique. Practise writing 'wet chemical, applied softly to the surface to form a soapy blanket, heat source shut off first, never a jet'. Build a one-line table for each class (A, B, C, D, F) with the correct medium and the wrong medium most often chosen, so the distractor is recognised instantly.
The candidate describes fighting a fire in a closed compartment by opening the door fully and entering with a jet, without mentioning boundary cooling, closing openings, or shutting down ventilation first.
Candidates learn extinguishing media and tactics as separate subjects, so under time pressure they jump straight to 'attack the seat of the fire' and skip the containment sequence that the marking scheme expects. Films and drills emphasise the hose run, not the ventilation control that precedes it.
What to do instead
Adopt a fixed answer sequence for any compartment fire: alarm and muster, boundary cooling, stop ventilation and close openings, isolate fuel and power, then attack. Write it out as a numbered list and rehearse applying it to three different scenarios (engine room, accommodation, cargo hold) until the order is automatic.
The candidate treats the fire triangle and the fire tetrahedron as interchangeable, and when asked why a CO2 extinguisher works, answers only 'it removes oxygen' without mentioning the chemical chain reaction or the cooling and dilution effects.
Many candidates learn the triangle first and never update to the tetrahedron, so the fourth element (uninhibited chain reaction) is missing from their mental model. They then give a single-mechanism answer where the question asks for the full extinguishing principle.
What to do instead
Learn the tetrahedron with one extinguisher mapped to each side: water cools, foam and CO2 smother, shutoff removes fuel, dry chemical interrupts the chain reaction. For each extinguisher type, be able to state which side(s) it attacks and which it does not, and use that mapping to answer 'why does it work' questions.
When asked about flashpoint, auto-ignition temperature, or flammable range, the candidate confuses the definitions, for example saying a liquid with a low flashpoint is safe because it is 'cold', or claiming a gas below its lower flammable limit will not burn if a source of ignition is present.
These are abstract numbers with no visible shipboard referent, so candidates memorise the words without the meaning. The lower flammable limit answer is especially prone to error because candidates forget that adding oxygen or a rise in concentration can move a mixture back into the flammable range.
What to do instead
Anchor each term to a concrete example: diesel flashpoint above 60 degrees Celsius versus petrol below minus 40, and the fact that a nearly empty fuel tank is more dangerous than a full one because of the vapour space. For flammable range, draw the scale and mark too lean, flammable, too rich, then explain what changes the boundaries.
The candidate describes donning SCBA without a pre-entry check, or skips the buddy/entry-control element, entering alone or without a recorded time and a designated standby person.
Drills are often run as a race to get dressed quickly, so the check sequence is compressed or omitted. Candidates also treat entry control as paperwork rather than a life-safety system, and the exam's scenario wording rewards the dramatic rescue over the procedural answer.
What to do instead
Memorise a donning and entry checklist in order: cylinder pressure, high-pressure and low-pressure leak test, whistle or alarm test, face mask seal and positive-pressure check, then buddy check, entry control log with name, time in, and air duration. Answer rescue questions by first stating that no one enters without entry control and a standby team.
The candidate answers a fixed-installation question by describing the wrong system for the space, for example recommending a CO2 total-flooding system for accommodation, or a water sprinkler system for a machinery space with live electrical equipment.
Candidates learn system names without the selection criteria (occupied spaces, electrical risk, reflash risk, clean-agent requirements). Because CO2 and foam both sound 'total flooding', the distinctions blur under exam pressure.
What to do instead
Build a matrix of space versus system: accommodation uses sprinklers or water mist, machinery spaces use CO2 or clean agent with pre-discharge alarm and evacuation, cargo holds use CO2 or foam depending on cargo, paint lockers use CO2 or dry powder. For each, note the reason (personnel safety, electrical isolation, clean-up) so the choice is justified rather than guessed.
When asked about hot work, the candidate lists the permit but omits the specific controls: gas-freeing and atmosphere testing, removal of combustible material within the area, a fire watch with extinguishing equipment, and a post-work check period.
The permit is the memorable artefact, so candidates stop there and treat the surrounding controls as optional detail. They also forget that the fire watch must continue after the work stops, which is the control most often tested.
What to do instead
Learn hot work as a sequence of controls in time order: before (risk assessment, gas test, isolation, housekeeping, permit), during (fire watch, continuous monitoring, no change of scope), after (fire watch maintained for the specified period, area re-checked, permit closed). Write the sequence from memory and check it against the controls you would actually verify on deck.
The candidate confuses the roles in the shipboard fire organisation, for example assigning the master to lead the fire party at the scene, or failing to distinguish the on-scene leader from the command point and the bridge.
Candidates learn role names in isolation and never map them onto a command structure. In drills the same senior person often appears everywhere, which reinforces a blurred picture of who does what.
What to do instead
Draw the command structure as a simple diagram: bridge as command and communications, master as overall authority, an on-scene leader at the fire, fire teams, boundary cooling team, ventilation and isolation team, first aid and stretcher party, and a muster and headcount function. Then answer role questions by locating the person on the diagram before naming the duty.
The candidate answers a detection and alarm question by naming the detector type without matching it to the fire type or environment, for example specifying an ionisation smoke detector in a galley or an optical detector in a dusty cargo hold.
Detector types are memorised as a list of names, not as a match between sensing principle and expected fire signature. Candidates also forget nuisance-alarm behaviour, which is the reason certain detectors are excluded from certain spaces.
What to do instead
Learn each detector by what it senses and where it fails: ionisation for fast flaming fires but prone to cooking and dust false alarms, optical for smouldering fires, heat detectors for spaces where smoke detectors would nuisance alarm such as galleys and laundries, flame detectors for fuel and gas hazards. Answer by stating the space, the expected fire, and the detector that matches both.
After a fire is extinguished, the candidate declares the situation safe and omits reflash watch, atmosphere monitoring, isolation of damaged systems, preservation of the scene for investigation, and reporting.
The narrative ends at 'fire out', so post-fire content feels like an appendix and is under-rehearsed. Candidates also assume the investigation is someone else's job and do not connect scene preservation to the reporting duty.
What to do instead
Treat 'fire out' as a midpoint, not an ending. Learn a post-fire checklist: continue cooling and reflash watch, monitor the atmosphere before entry, isolate and tag out damaged electrical and fuel systems, do not disturb the scene beyond making it safe, record times and actions, and submit the report through the correct channel. Rehearse it as the final step of every scenario answer.