Basic DC Fire fighting
how many classes of fire are there?
4
How many types of fire extinguisher agents are there?
5
Define fire/smoke boundaries
Any physical barrier can be a fire boundary. Smoke curtains help prevent smoke
Describe indirect fire fighting
Application of water fog through a hole or bulkhead
What is the smoke control/buffer zone?
Area in between the primary and secondary boundaries. Leads to outside to assist in desmoking an area
Describe how PKP fire extinguishing agents work
Chemically interrupts the combustion chain reaction of the fire triangle
Describe how heptaflouropropane fire extinguishing agents work
Chemically interrupts the combustion of the chain reaction of free radicals
What are the 3 types of heat transmission?
Conduction Convection Radiation
Describe how a water fire extinguisher agent works
Cools the fuel, removing the heating element
Describe fire venting procedures
Cut a hole in overhead above fire Allows heat to escape and an extra place for indirect fighting
What are the 2 ways to fight a fire?
Direct fire fighting Indirect fire fighting
Describe overhauling a fire
Examination and cleanup and seeing what was affected by the fire.
Describe direct fire fighting
Firefighters go to the fire and fight with an agent
Heat can be...
Flame Got surface Sparks Friction Electrical short circuit Electric arc
What 4 elements comprise the fire tetrahedron?
Fuel Heat Oxygen Uninhibited chemical chain reaction (UCCR)
Discuss convection
Heat transferred through gasses or smoke
Discuss conduction
Heat transferred through molecular structure of a solid object
Discuss radiation
Heat transferred through the atmosphere
Spontaneous combustion
Ignition caused by heat from chemical decomposition of organic material
Describe a class Charlie fire
Involves energized electrical equipment
Describe a class bravo fire
Involves flammable and combustible liquids IE has/fuel
Describe a class alpha fire
Involves wood and wood products. Creates ashe
Describe how a CO2 fire extinguisher agent works
Is heavier than air, it displaced or reduces oxygen concentration.
Describe how AFFF works
Lighter than fuels. Floats atop creating vapor seal, separating fuel from oxygen. Also cools.
Define ignition point
Minimum temp required to initiate self sustained combustion
Describe negative ventilation
More air is being removed than supplied to keep smoke contained
Discuss oxygen and other oxidizers
Normal air contains 20.8% oxygen Some fires need only 6% oxygen Some fires produce their own oxygen
Discuss reporting a casualty
Notify bridge or CCS and give: Your name Type of casualty Location of casualty
What are the two types of ventilation
Positive ventilation Negative ventilation
Describe positive ventilation
Push more air into area to dilute gasses
Describe active de smoking procedures
Removing smoke and heat from an area to help prevent spread of smoke through the ship
Describe a class delta fire
Requires special procedure to extinguish or is a metal fire
Fuels can be a...
Solid Liquid Gas
Define fire point
Temp which sufficient vapor is given to continue burning after ignition
Define flashpoint
The lowest point at which liquid gives off vapor to form a flammable mixture
Discuss uninhibited chemical chain reactions
With out this, will only smolder or glow Needed for combustion
