Post on 22-Dec-2015
A LITTLE ABOUT ME
•South Bend Firefighter 12 years
•Wife and three kids
•Captain of Engine 8 (in the hills)
•EMT-adv
•Shift instructor, flashover instructor
•Hazmat team
A LOT ABOUT YOU
• Name
• Department
• Years in the fire service
• Type of apparatus
• What do you want from this class
• Favorite color
FIRE PUMP THEORY
• Why do you need to know and understand, how the pump work?– Moving Water– Making Pressure– Maintaining – Troubleshooting
PUMP TYPES
• Positive displacement– Original fire pump– Used primarily as primers today– Constant volume– Will pump air– Types
• Piston• Vane• Rotor gear
FIRE PUMPS
• CENTRIFICAL– Based around the spinning disk– Volume dependent on supply– Types
• Single stage
• Series/parallel (two Stage)
• Third stage high pressure
– Used in today’s fire pumps
THE TWO STAGE PUMP
• Designed to operate in pressure and volume modes
• Series used for high pressure lower volume (less than half rated volume)
• Parallel used for high volume low pressure
• Has some type of a change over valve
THE RELIEF VALVE
• Safety system for the firefighters on the hose lines
• Must be used anytime more than one line is operation
• Protects lines from over pressurization• Most operate from 70 to 300 psi• Must operate with less than a 30 psi surge• Will not operate if inlet pressure to high
PRESSURE GOVERNERS
• Maintains pressure by operating engine throttle control– Mechanical– Electronic
MAINTANCEVS
REPAIR
• Prevent future problem
• Keeps in working• Inspect to find
defects• Complete on a
regular schedule
• Fixing what is broke• Replace worn parts
UNDER THE HOOD
• Engine oil• Transmission fluid (automatic)• Coolant• Washer fluid• Brake fluid• Belts• Hoses• Batteries• Leaks
PUMP AREA
• Inside and under– Leaks
• Water• Other fluids
– Primer oil level
• Panel– Move of valves– Lights– Gauges– Line connections– Change over valve– Relief valve
MEASURING THAT WATER
• Pressure– Force exerted by the
water
– Measured in pound per square inch (psi)
– Or inches of mercury
• Volume– Amount of water
flowing
– Measured in gallons per minute (gpm)
NET PUMP DISCHARGE PRESSURE
• NDP=FL+A+E+N– FL= FRICTION LOSS– A=APPLIANCE– E=ELEVATION
• 5 PSI PER 10 FT OR 5 PSI PER FLOOR MINUS 1
– N=NOZZLE
FRICTION LOSS
• The amount of pressure lost, as water flows through hose and appliances
• Points to remember– Flow goes up so does the loss– Smaller hose more loss– Kinks
FINDING FRICTION LOSE THE HARD WAY
• FL=CQ2L
• Examples– 200’ of 13/4” hose flowing 200gpm
• 15.5x22x2=124psi
– 1000’ of 5” flowing 1000gpm• .08x102x10=80psi
FRICTION LOSS MADE A LITTLE EASIER
• Hand method
• Flow methods
• Charts
• Predetermined settings
• Hose team yelling at you
SETTING UP THE PUMP
• Parking brake/ wheel chocks
• Neutral
• Shift transfer case
• Transmission in to correct gear
• Water into pump
• Someplace for it to go
• Set pressure
FROM THE BOOSTER TANK
• Open tank valve
• Prime if needed– How long?
• Place for it to go
• Crack open tank fill
• Remember limited supply of water, and limited flow
CHANGING OVER
• Tank water to draft
– May decrease discharge pressure
• Tank to pressurized
– Will increase discharge pressure