Structural Flashcards
What is RECEO?
Rescue – Protect people
Exposures – Protecting uninvolved property & environment outside of structure on fire
Confinement – Protecting uninvolved property within structure on fire
Extinguishment - eliminating fire
Overhaul - Restoring normality to scene
What is BSAHF
Building – construction & materials impact on fire behaviour
Smoke – colour, density, velocity, volume. Neutral plane and changes of it
Air track – way air flows between inlets and outlets
Heat – blackening and crazing of windows, blistering in paint
Flame – flame colours i.e yellow, red/orange and blue
In your own words, explain what is meant by LEL and UEL
LEL: lower explosive limit, the leanest mixture that is still flammable
UEL: Upper explosive limit, the richest mixture that is still flammable
Define Pyrolysis
The chemical breakdown of an organic substance by heat, in absence of oxygen
Why is smoke considered to be flammable?
Because smoke is produced by incomplete combustion, therefore there is unburnt
fuel in the smoke which can ignite when reaches auto ignition temperature
Define Auto ignition temperature
Min temp required to cause self sustained combustion, in absence of spark or
flame. Ignition temps may be reached through radiant, conducted or convection
heat.
What is a fuel controlled fire and ventilation controlled fire?
Fuel controlled fire: Has adequate oxygen to complete combustion, just requires
access to fuel to continue growth and continuation of fire.
- Ventilation controlled fire: A fire with access to copious amounts of fuel but with
possible restrictions to access to air.
Why close doors and windows of structure impacted by fire?
Removes the oxygen section from the fire triangle, starving the fire of oxygen
What is Vapor Density?
Weight of pure vapor or gas, relative to the weight of an equal volume of dry air at
same temp and pressure. Air =1
