Chapter 13: Class notes study set
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25 Terms
What size are primary feeder pipes?
16 inches.
What size are secondary feeder pipes?
12 inches.
What is the smallest distribution-size piping, distinguished from residential piping?
8 inches.
What pipe sizes may be found in industrial areas?
10-12 inches.
What pipe sizes may be found in residential areas?
6-8 inches.
What is the most common type of water distribution system?
The combination system.
How much water do most engines carry?
500 gallons.
How often should fire hydrants be inspected?
At least annually.
How does a grid system supply water?
It delivers water from more than one direction.
Why can a hydrant on a dead-end main have a limited available flow?
Water reaches it from only one direction.
What does GPM stand for?
Gallons per minute—a measure of water flow rate.
What flow capacity does a light blue hydrant top indicate?
1,500 GPM or more.
What flow capacity does a green hydrant top indicate?
1,000-1,499 GPM.
What flow capacity does an orange hydrant top indicate?
500-999 GPM.
What flow capacity does a red hydrant top indicate?
Less than 500 GPM.
How far apart should hydrants be spaced?
300 feet.
What minimum residual pressure is identified in your hydrant notes?
20 psi while water is flowing.
What is static pressure in a hydrant flow test?
The pressure measured before water is discharged for the test.
What is residual pressure?
The pressure remaining in the water supply system while water is flowing.
What does low pressure mean?
Pressure below the normal or required level for the system or operation.
In what direction is supply hose laid during a forward lay?
From the water source toward the fire or incident.
In what direction is supply hose laid during a reverse lay?
From the fire or incident toward the water source.
What maximum hard suction hose length is specified for drafting?
20 feet of hose.
What quantity and contamination conditions should a static source meet for drafting?
It should contain sufficient water with no more than moderate contaminants.
How can overhaul affect the likelihood of structural collapse?
Overhaul can increase collapse risk if opening or removing materials damages or weakens load-bearing components.