Notes from Class

Question 1

Friction loss in 2 1/2” hose, field hydraulics

Answer 1

Flow (GPM) minus 100, drop the last digit, gives FL per 100 ft
Example: 210-100 = 110, drop last 0 = 11 psi per 100
Applicable for 150 to 350 GPM

Question 2

Friction loss in 4” hose, field hydraulics

Answer 2

Flow x2 -4 = FL per 100 ft up to 800 GPM

300 GPM = 2 psi
400 GPM = 4 psi
500 GPM = 6 psi
600 GPM = 8 psi
700 GPM = 10 psi
800 GPM = 12 psi

Question 3

How many gallons of water are in a cubic foot of water?

Answer 3

7.48 gallons

Question 4

Nozzle range rule of thumb

Answer 4

1 psi of NP = 1 foot of range

Question 5

How much water is in 100’ of 1 3/4” hose?

Answer 5

12.5 gallons

Question 6

How much water is in 100’ of 2 1/2” hose?

Answer 6

26 gallons

Question 7

How much water is in 100’ of 4” hose?

Answer 7

65 gallons

Question 8

How much water is in 100’ of 5” hose

Answer 8

102 gallons

Question 9

How much does 1 gallon of water weigh?

Answer 9

8.34 pounds

Question 10

What makes a diesel engine fire?

Answer 10

Heat of compression, not from spark of a spark plug

Question 11

What types of brakes are used on all engines?

Answer 11

Front are disc brakes. Rear are drum brakes. Parking brake is spring brake.

Question 12

Minimum air pressure to move apparatus?

Answer 12

60 psi

Question 13

Spring brakes are automatically applied at what pressure?

Answer 13

40 psi

Question 14

Normal operating pressure of brakes

Answer 14

90-120 psi

Question 15

What pressure does the compressor kick in?

Answer 15

100 psi

Question 16

What is brake fade?

Answer 16

When the brake drums become too hot and expand away from the brake shoes.

Question 17

What does shoreline power do?

Answer 17

Provides conditioning of all batteries, power to the block heater, and on board chargers such as TIC, e-tool batteries, flashlights

Question 18

Rule for volume vs. pressure mode

Answer 18

If you are going to flow more than half of the rated capacity of the pump, pump in volume.

Question 19

Rule for switching between volume and pressure

Answer 19

Must be less than 50 psi difference between intake and discharge, or switch at idle

Question 20

Static Pressure

Answer 20

Pressure of fluid at rest. You connect to a hydrant and open the hydrant but no water is flowing. The intake gauge will read static pressure.

Question 21

Residual Pressure

Answer 21

Pressure remaining after water is flowing. Connect to a hydrant, open a discharge, and the intake gauge will drop from its static reading, showing residual pressure.

Question 22

Head pressure Equation

Answer 22

Head pressure in psi = Height in feet/2.304

Question 23

2 settings on the Blitzfire Fog Nozzle

Answer 23

Low Pressure = 55 psi. Standard = 100 psi

Question 24

Distance between fire hydrants

Answer 24

700’ in residential, 400’ in commercial, 300’ in industrial

Question 25

The most common type of positive displacement pump used in priming pumps are

Answer 25

Rotary vane