Flashcards in Ch. 3 Engine Company Operations Deck (21)
On smoldering fire, what do we do if plan A (vent roof) and plan B (indirect attack) don't work?
Open it up and let it explode.
Attempt to blow the windows in with preferably master stream, solid stream for reach and impact.
Rule for back drafts occurring in free burning fires?
Won't occur in the AREA that is free burning but can occur in other adjacent areas that have NOT been thoroughly vented.
*MOST COMMON-fires on top floor of apts, schools and other Class 3 bldgs with cockloft over entire top floor*
Combination Method of Attack - Advantages and Disadvantages (3/2)
1. Cool gases near nozzle, less steam pushed, more visibility
2. Shutting down nozzle when fire knocked down-don't disturb thermal balance
3. FF's near seat of fire, best position to save lives
1. Puts members in extremely hostile environment
2. Requires live-fire training to develop proficiency
Indirect Method of Attack (smoldering) advantages and disadvantages (5/5)
1) Reduce FF exposures to backdraft
2) can extinguish fire in areas where heat won't let FF's go
3) allows very limited crew to do work (vs combination)
4) uses less water (use-supply)
5) less water damage/runoff
1) can't be used in occupied bldg
2) vent openings will dilute steam
3) discharge of less than critical volume can push fire
4) isn't possible to view interior layout
5) can INCREASE water damage (not enough heat to make steam)
3 Operating MODES
No Attack (no action)
Offensive operations proceed on:
Assumptions that sufficient resources are available
Extinguishment may have to be delayed because: (3)
Let civilians past fire.
Let FF's perform rescue.
Factors that influence time to position a handline: (4)
Number of personnel on hand.
Height/area of structure.
Locations of fire.
Distractions of other operations.
The three fire stages and the method of firefighting applicable
Incipient - Direct.
Free Burning - Combination.
Smoldering - Indirect (then combination depending on resources).
Two CLASSIC indicators of third-stage fire (Indirect):
Four basic/key requirements for Indirect Attack (3rd stage fires)
1. Limited ventilation
2. No (endangered) occupants
3. High heat
4. Point on perimeter for 30 degree fog (p. 44)
OR limited size of potential fire area (p. 45)
Cardinal rule of aggressive FFing
Don't use an outside stream in an occupied bldg
Weight of one length of ______ hose: dry weight is _____ and charged weight is ________.
1 3/4 in.
Ceiling temps at _____ in a fire room while floor temps are ______.
1 gallon of water expands to ________ gallons of steam when FULLY vaporized
(1,700 in SSFO)
Plan A (vent) and B (indirect) have failed
Coordination of breaking window and hose stream. Spraying water for how long for likelihood of backdraft to be over (in that area)
30 seconds or so
Fire has self-vented through many small openings so Indirect is not likely to work. Next is ________
Creating many small openings around perimeter and use single-large flow stream
Single large-flow stream may __________________, thus ____________. Too small a flow will _________________. Too low a flow with a fog stream is likely to ________.
EXTINGUISH the fire in a small area, reducing superheated air needed for steam.
NEGATIVE effect on operations and do little to extinguish the fire.
PUSH fire into other areas
Fire that is inaccessible may require an unusual attack: (3)
Cellar pipes, distributors or high-expansion foam
Master stream from elevated platform can cover _____ frontage and _______ high. If on a flank, it can cover ______.
100 ft, UP TO 3 stories high