Classes of Fire
Name some materials that may be involved in a Class A fire
Wood, paper, vegetation, natural products
What comments make up the fire tetrahedron
Heat
Fuel
Oxygen
Uninterrupted chain reaction
Where would you expect to find a gas with a vapor density of 0.5
It will float away or rise to the top in confined spaces
Name some of the governing bodies that impose rules and regulations on the Fire brigade
OSHA
NFPA
What is the difference between offensive and defensive attacks
When house is advanced into a building, to the seat of the fire, the attack is offensive.
Defensive attack is used when the fire is too large to be controlled by an offensive attack or when the risk to FFs is too great to outweigh the benefit
This type of fire involves energized electrical equipment
Class C Fires
In this phase of fire, the fire is contained to its original container of origin
Incipient
What must happen to a liquid before it will burn
It must be converted to a vapor
What is the difference between an SOP and SOG
You shall/you should
What size hoses are most commonly used for interior, offensive attacks
1 3/4”
What materials are burning in Class B fires?
Flammable liquids such as gasoline, kerosene, and oil
A fire has been burning for quite some time, and has all of the oxygen within the room. What phase of fire will likely occur?
Decay
Describe upper and lower flammable limits
There is a minimum and maximum concentration of fuel air mixture that is needed for fire to occur. Too lean/too rich
Describe the chain of command
Each person has only one supervisor
What appliance OSS used to split a 2 1/2 house into two 1 3/4 attack lines
Gated wye
What class of fire is most common in commercial kitchens
Class K fires involving cooking oils and fats
Name the 3 primary ways heat is transferred
Convection
Conduction
Radiation
What does BLEVE stand for
Boiling liquid expanding vapor explosion
When is incident command established?
Who is the incident commander
Any time an emergency response is initiated
The first arriving FBL and is they wil transfer command as needed
Describe water hammer
Surge of pressure caused when a high velocity flow of water is abruptly shut off
You are dispatched to an electric vehicle fire. What class of fire may be involved if the battery is on fire?
Class D, special metals
What type of chemical reaction produces heat
Exothermic
Describe what happens in a BLEVE
When a tank storing liquid fuel under pressure is exposed to fire/excessive heat
Fire heats up tank, causing it to generate more vapors
Internal pressure Rouse’s
Tank ruptures explosively
Liquid is released and turns into a fire ball
Describe unified command
Brings representatives from different agencies together to work on one plan and ensures all efforts are coordinated
What are three methods of foam application
Roll on
Back down
Rain down