202.12E Water Supply & Fire Stream Management Flashcards
Delayed or limited water supply and inadequate GPM flows lead to?
- delayed fire control
- increase risk to FF and victims
- greater fire loss
Adequate water supply during fire attack operations has a critical impact on?
fire control outcomes
Contact with the __________ to provide total master stream gpm requirements should always be considered.
water department
4” hose is limited to 800 gpm at ___ __ _____ before it must be pumped by another engine at the hydrant.
500ft in length
The objective of the attack hose line choice is to?
Provide enough gpm to overcome the volume of fire being produced, or an adequate flow to effectively cool and protect exposures
If you apply water to an offensive attack position and the fire does not go out -?
React! Back it up or re-deploy to more effective position
What are the 3 exceptions for not laying a supply line on a first in obvious working fire?
- Obvious critical rescue requiring full crew
- unsure of fire location in multi-unit complex
- hydrant within 50ft of fire
What are the 3 advantages of slower speeds while laying supply line?
- Safety
- provides time for Officer to size up scene
- provides time for engineer to spot apparatus
What 3 ways does staging key pumpers on hydrants enhance fireground safety?
- Ensures uninterrupted water supply
- provides volume when needed
- ability to pump through broken apparatus
What should be done by 1st alarm companies before pumped water is considered?
-Lay their own supply lines to cover all critical tactical positions
A non pumped 500ft 4” supply line can flow how many GPM?
800 GPM
How many supply lines must be laid between key pump at hydrant and pump at the ladder and why?
-2 supply lines, 1 supply line will limit ladder to about 1200GPM
Most ladders in the valley are platforms with two guns and have the ability to flow how many GPM?
2000 GPM
Where should attack hose lines be placed?
- 1st – between fire & victims, when no victims- 1st should be placed between fire and most severe exposure,
- 2nd – protect secondary means of egress
- additional lines should cover other critical areas or when covered, back up in place hose lines
What are the characteristics of a Solid Stream?
Greater penetration, reach and striking power, less steam conversion
What are the characteristics of a peripheral stream?
-Increased heat absorption/expansion, shorter reach
Never advance in a building more then _________ ft
150ft
Whenever possible, crews should position hose lines in a manner and direction that?
supports rescue activities, begins confinement, protects exposures, and controls loss
What are characteristics of 1-3/4” lines?
Fast, mobile, greater volume, 175GPM
What are characteristics of 2” lines?
-Reasonable speed, mobility and variable volume depending on pump pressure and nozzle, up to 350GPM.
What are characteristics of 2-1/2” lines?
-Slow, difficult to move, 250GPM
What are the characteristics of elevated master stream?
-Mostly stationary, slow to setup, max water 500 – 1000GPM
What are characteristics of engine mounted master stream?
Fast, large volume, great reach and penetration, 500 – 1000GPM
What type of stream should be used in basement fires?
Straight Stream
