Operating Fire Pumps Flashcards
Pump Indicators Inside The Cab (Four)
- “green” light
- Speedometer reading 10-15 mph
- Feel/hear pump engage
- 4th gear (NOT 5th)
Pump Indicators Outside The Cab (Four)
- “middle pump engaged” light
- “green” light (Pierce)
- “yellow” light (Seagrave)
- Water in the pump (positive reading on the master discharge gauge)
Manual Pump Engagement
- Two people
- While pump control is in neutral push (Pierce) or pull (Seagrave) manual pump shift. Pump engagement light should be on, wait four seconds, shift transmission into drive, shift pump control into pump (lowest position)
Three Main Water Sources
- Water Tank
- Pressurized Source
- Static Source
Two Basic Pressurized Water Sources
- Hydrant
- Another Pumper
Forward Lay Key Steps/Numbers
- Pull past hydrant no more than 20’
- Drop hose at hydrant and proceed to fire no faster than 5 mph
Supplying w/ Short Section of 5” Supply Line
-Stop apparatus with front or rear bumper in line with hydrant 10’-15’ away
Minimum Residual Pressure
20 PSI
Dual Pumping Operations
- Intake to intake
- Second pumper receives excess water not being used by the first pumper
Tandem Pumping Operations
- Discharge to intake
- Second pumper boosts the incoming pressure, short relay operation
- Commonly used when high pressure or high friction losses cannot be avoided
Relay Pumping Operations PSI
- Supply pumper: 175 PSI
- Relay pumper: 175 PSI
- Attack pumper: Adjust PSI for attack lines
Can We Exceed The Rated Pump Capacity?
-Yes, 2,000 GPM is from a static source
Atmospheric pressure sea level/Albuquerque
- Sea level: 14.7 PSI
- Albuquerque: 12.2 PSI
Lift Required for Drafting
-NFPA requires 10’ of lift for capacity requirement
Recommended Amount of Mercury for Drafting
22” (20” per AFR)
Operating From a Static Water Source, Clearances/Max Amount Hard Suction Hose
- Strainer: 24” in all directions
- Max 20’ hard suction hose
- Max 10’ high
Engine RPM’s for Drafting
1,000-1,200 RPM’s
Volume vs Throttle mode for drafting
- Two stage pump: Transfer valve in VOLUME mode
- Pressure governor: Throttle mode
Master Discharge Pressure for Drafting
50-100 PSI, open discharge valve slowly pausing if discharge pressure drops below 50 PSI
Operating from a Water Tank
- Engage pump
- SET WHEEL CHOCKS
- Switch to pressure mode
- Open “tank to pump” valve
- Pull primer
- Open tank fill valve (if needed)
Transition to External Water Supply
- Open “tank to pump”
- Prime pump
- Charge both 1 3/4” handlines
- Remove cap on hydrant/flush hydrant
- Connect 5” to drivers side PIV (ensure bleeder valve is open) and hydrant
- Open hydrant
- Close bleeder valve
- Open intake while throttling down (if necessary)
- Fill tank (attack lines have priority, make sure tank fill valve is closed when opening PIV and transitioning to external water source)
- Open auxiliary cooling valve if necessary
