Handbook of Tactics Ch 4-6 Flashcards
How many BTUs will a pound of wrapping paper give off when burned?
7,100 BTUs
How many BTUs does 1 pound of styrene foam give off?
18,000 BTUs
What two criteria determine whether your stream will extinguish the fire?
- VOLUME- Must be of sufficient to remove the heat being generated.
- REACH- The water must actually reach the heart of the fire.
How many BTUs per gallon does water absorb when raised from 70° to completely vaporized.
9,275 BTUs
A 1-3/4” line provide sufficient flow to knock down _________ of fire rapidly.
Four or five rooms
What size hose should you stretch for a large body of fire in a commercial or industrial fire?
2-1/2”
How many firefighters are required to operate a 2-1/2” line flowing 325 GPM through a 1-1/4” tip?
It can be handled by two people and moved by three.
What is the average size of a store in a one-story commercial building of ordinary construction, commonly called a taxpayer or strip mall?
20 x 75ft
What dictates the length of hoseline needed at a structure fire?
- Building height
- Building area
- Setback from the street
What dictates the diameter of the hoseline needed at a structure fire?
- Occupancy
- Area of the building
- Size of the fire
What is the maximum length of 1-1/2” hose if you want to flow 125 GPM?
200 ft
What is the maximum length of 1-3/4” hose if you want to flow 150 GPM?
300 ft
What is the rule of thumb for length of hose line needed?
The length plus the width of the building, plus one length for each floor above or below grade. (Plus extra for setback if needed)
The nozzle man should arrive at the fire area with at least ______ of hose
50 ft
Why should you chock doors open when stretching hoselines?
If the door closes and then the lead is charged it can:
- Lock the door closed
- Restrict the flow
- Prevent further advance
What are three priorities to consider when stretching the hoseline?
- Protect human life
- Confine the fire
- Extinguish the fire
Except for specific life hazards, what is the first priority for positioning a hoseline in a multi-level building?
Position a hoseline to protect the interior staircases.
When stretching a hoseline up the exterior, where should the hoseline enter the building?
Either the floor below or into a staircase window 1/2 story below.
Is it acceptable to stretch a dry lead in the stairwell?
Yes, if the fire is above you. Never for below grade fires
Generally one should attack from the unburned side. What are two exceptions to this rule
- When there is a potential life hazard, bring the lead straight to a location that puts it between the fire in the trapped occupants.
- A vacant or abandoned building.
No nozzle should have an opening greater than_______.
1/2 the diameter of its supply
Is it possible to use a larger tip than the rule of thumb (1/2 of hoseline diameter)?
Yes, if the hose stretch is kept short and the discharge pressure is raised sufficiently.
How does an impinging jet nozzle create a dense fog?
By directing streams of water into each other
What are the three functions of a nozzle?
- SHUT-OFF and regulation of the amount of water flowing past.
- Increase the VELOCITY of the water flowing through the hose.
- SHAPE the stream.
