Fire

Question 1

Fire Classes and what extinguisher you would use. What are the colour bands on these extinguishers?

Answer 1

A=Solids=Water,Foam,Dry Powder
B=Liquids=Foam,Dry Powder,CO2
C=Gases=Dry Powder
D=Metal=Class D Powder
Electrical=Dry Powder,CO2
F=Cooking Oils & Fats=Wet Chemical

Water=red, Foam=cream, Dry Powder=blue, CO2=black, Wet Chemical=Yellow

Question 2

BA Checks

Answer 2

Red button, open cylinder, check gauge.
Mask on, take breath & check face seal (up down left right) listening for leaks
Positive pressure with 2 fingers
Cylinder off and back on a half turn, should whistle then fully open
Hold breath and cylinder off for 10 secs then small breaths for whistle
Test supplementary supply (black button)

Question 3

Fire Pump Requirements

Answer 3

Must be atleast 2 onboard
The main pump should be in the engine room while the emergency pump should be located in a compartment outside the machinery spaces.

Question 4

What is considered a hot surface?

Answer 4

Any surface over 230°c

Question 5

Different classes of bulkheads and their requirements?

Answer 5

Class A:
-must be made of steel or equivalent material
-must prevent passage of smoke or flame for 60 minutes
-must be placed in high risk/high valued areas or areas where passenger will pass through such as stairwells.
-the max temp should not reach over 180°C

(Class A60 - no heat transfer for 60 minutes)

Class B:
-must be made of steel or equivalent material
-must prevent passage of flame for 30 minutes
-placed in medium risk areas
-max temp should be 239°C

Class C:
-made of non combustible material so they do not give off flammable gasses at 750°C

Question 6

What convention mandates rules of bulkheads?

Answer 6

SOLAS Chapter II-2

Question 7

How can a fire occur in the scavenge space.

Answer 7

A fire can occur in the scavenge space due to the ignition of carbon deposits in the scavenge air box or due to excess cylinder oil feed rate. (Burning or glowing carbon deposits drop into the oil sludge)

Question 8

How can a scavenge fire occur

Answer 8

-an increase in exhaust temp of the affected cylinder
-Turbocharger may surge
-Smoke from turbocharger air inlet filter when surging occurs
-Scavenge air box becomes noticeably hotter

Question 9

What to do in the event of a scavenge fire

Answer 9

-Reduce ME speed and ask bridge to stop
-Stop ME and turn off aux blowers
-Stop fuel oil supply
-Stop Lube oil supply
-Do not open doors until temp drops below 100°C
-Remove any deposits from boxes
-Clean piston rods and liners and check condition of scavenge space
-retighten and overhaul with caution

If the main engine cannot be stopped the stop the fuel and supply more LO for the affected area