Flashcards in Notes from Class Deck (25)
Friction loss in 2 1/2" hose, field hydraulics
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
Friction loss in 4" hose, field hydraulics
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
How many gallons of water are in a cubic foot of water?
Nozzle range rule of thumb
1 psi of NP = 1 foot of range
How much water is in 100' of 1 3/4" hose?
How much water is in 100' of 2 1/2" hose?
How much water is in 100' of 4" hose?
How much water is in 100' of 5" hose
How much does 1 gallon of water weigh?
What makes a diesel engine fire?
Heat of compression, not from spark of a spark plug
What types of brakes are used on all engines?
Front are disc brakes. Rear are drum brakes. Parking brake is spring brake.
Minimum air pressure to move apparatus?
Spring brakes are automatically applied at what pressure?
Normal operating pressure of brakes
What pressure does the compressor kick in?
What is brake fade?
When the brake drums become too hot and expand away from the brake shoes.
What does shoreline power do?
Provides conditioning of all batteries, power to the block heater, and on board chargers such as TIC, e-tool batteries, flashlights
Rule for volume vs. pressure mode
If you are going to flow more than half of the rated capacity of the pump, pump in volume.
Rule for switching between volume and pressure
Must be less than 50 psi difference between intake and discharge, or switch at idle
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.
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.
Head pressure Equation
Head pressure in psi = Height in feet/2.304
2 settings on the Blitzfire Fog Nozzle
Low Pressure = 55 psi. Standard = 100 psi
Distance between fire hydrants
700' in residential, 400' in commercial, 300' in industrial