Chapter 14: Water Supply Systems Flashcards
What gpm and color is a class C fire hydrant
> 500 gpm
Red
What gpm and color is a class B fire hydrant
500-999 gpm
Orange
What gpm and color is a class A fire hydrant
1000-1499 gpm
Green
What gpm and color is a class AA fire hydrant
1500 gpm and higher
Light blue
Mobile water supply apparatus’ are often called:
Tankers or water tenders
How much can portable water tanks carry?
600-5000 gal
Term for the top of a hydrant
Bonnet
How much gpm can a portable pump deliver?
500 gpm
A lake or stream is an example of a:
Static water source
What type of water source does a dry hydrant access?
A static water source
What must be done with a dry-barrel hydrant to ensure it drains fully?
The discharge cap must be left off until it is drained
What are two ways fire fighters can obtain water
Municipal-type water systems
Static water sources
What are the 3 different sizes of water mains from biggest to smallest?
Primary feeders
Secondary feeders
Distributors
What tools can remove burrs on hydrant threads?
Steel brush
Small triangular file
What should be checked in hydrant caps during routine inspections?
Gaskets
What are the three parts of a municipal water system?
Water source
Treatment plant
Distribution system
Water main distribution systems follow a ____ system
Grid
The size of a water main is based upon:
The amount of water needed for normal consumption
Fire protection needs
What is a quick way to determine whether a dry-barrel hydrant is still draining ?
Place a hand against the opening and feel for suction
Static pressure
Pressure in a system when the water is not moving
When would a dry-barrel hydrant be required?
When the climate is subject to freezing
What does a dump valve on a tanker do?
Enables tankers to offload as much as 3000 gal of water in 1 minute
Water hammer
Surge of pressure caused by suddenly stopping the flow of a stream of water
How can fire fighters avoid water hammer?
Open and close hydrants and nozzles slowly
How often should hydrants be checked?
Annually
How may gallons of water do tankers usually carry?
1000-3500 gal
What are the two types of hydrants?
Dry-barrel
Wet-barrel
Most common size of fire hose outlets on fire hydrants?
2 1/2 in or larger
