Water Supply Flashcards
_____ pressure is the amount of water pressure in a system when water is not moving
Static Pressure
What is used to measure water pressure in PSI and calculate the volume of water in gallons?
Pitot Gauge
Normal operating pressure refers to what?
The amount of water in a system during a period of normal consumption
What is the amount of pressure that remains in the system when water is flowing out of a hydrant?
Residual pressure
What provides the best indcator of how much more water is available in the system?
The Residual Pressure
As more water flows does the residual pressure increase or decrease?
Residual pressure will decrease when water is flowing
What is the minimum usable residual pressure necessary to reduce the risk of damage to underground water pumps and pipes?
20 Psi
What are the three factors the influence friction loss?
Diameter of the hose valves or appliances
the volume of water traveling through the hose
the distance the water must travel
At a given hose size, a higher flow rate will produce more or less friction loss?
More
Which will have greater friction loss from a 2.5 inch hose?
300 Gpm or 200 GPM?
300 GPM
At a given hose size, a higher flow rate will always produce more friction loss
At a given flow rate which will create more friction loss a 2 inch or 3 inch hose?
2 inch
At a given flow rate the smaller the hose the greater the friction loss
Which will have greater friction loss when a flow rate of 500 Gpm is used.
2.5 inch or 3 inch
2.5 inch
At a given flow rate the smaller the hose the greater the friction loss
Static pressure is generally created by what?
Elevation pressure
What is the term used to describe a surge in pressure caused by suddenly stopping the flow of water?
Water hammer
What is the flow rate for a Class C fire Hydrant?
Less than 500 GPM
A red fire hydrant indicates what?
That it is a Class C fire hydrant
Less than 500 GPM at 20 Psi
What is the flow rate for a class B hydrant?
500 to 999 gpm
What does an orange fire hydrant indicate?
that it is a Class B hydrant
Has a flow rate of 500 to 999 GPM
What is the flow rate of a Class A hydrant?
1000-1499 gpm
What does a green fire hydrant mean?
That is is a Class A fire hydrant
it has a flow rate of 100-1499 gpm
What is the flow rate for AA fire hydrant?
1500 gpm or greater
What does a light blue fire hydrant indicate?
that it is a class AA
it has a flow rate greater than 1500 gpm
What is the large connection point on a fire hydrant called?
Streamer port
How often should fire hydrants be checked?
on a regular schedule of no less than one year
What is a dry hydrant or also called a drafting hydrant?
fixed piping system into a static water source that remains dry until it is needed.
