The hand method provides a fair estimate of: - Hose friction loss
Usually has a locking ball valve - Pump discharge
Must be located at the lowest part of the pump and lines - Pump drain
Line must have a check valve - Pump intake
Releases air into the atmosphere when a dry supply lin...
Mobile Water Supply Questions Correctly
Answered
The hand method provides a fair estimate of: - ✅✅ Hose friction loss
Usually has a locking ball valve - ✅✅ Pump discharge
Must be located at the lowest part of the pump and lines - ✅✅ Pump drain
Line must have a check valve - ✅✅ Pump intake
Releases air into the atmosphere when a dry supply line is being charged - ✅✅
Bleeder valve
Major advantage of a positive displacement pump over a centrifugal pump is that is
can: - ✅✅ Pump air, making it self priming
One advantage that electronic governors have over mechanical governors is that: -
✅✅ They maintain pressure in all other discharge lines if only one line trips the
governor
The efficiency of many priming devices is improved through the use of: - ✅✅
An oil-injection system
Advantages of centrifugal pumps over positive displacement pumps is that: -
✅✅ They can provide water in variable pressures and volumes
When performing a stationary op with a PTO driven fire pump, after you've
operated the PTO control, placed in transmission in gear, speedometer should read:
- ✅✅ Slightly above zeros
To disengage the pump on PTO driven pumps, begin by: - ✅✅ Reducing the
engine speed to idle
Steps for pumping from a hydrant: - ✅✅ 1.) Engage the pump/ make
connections
2.) Open intake valve and increase engine rpm
3.) Open discharge valve slowly
, 4.) Set the throttle
5.) Set pressure relief valve/ governor
6.) Monitor gauges and SOP's
Before performing a quick fill operation you should make sure the tank vents are
open because failure to have adequate venting during this operation could result in:
- ✅✅ A dramatic pressure failure of the tank
Identity two types of apparatus required to operate an effective water shuttle -
✅✅ MWS apparatus
Pumper or fire apparatus
How many gallons must an MWS apparatus carry? - ✅✅ 1,000 gallons
MWS apparatuses must be equipped with at least? - ✅✅ One External Fill
Connection
The External Fill Connection should: - ✅✅ - Filled at a minimum rate of 1,000
gmp
- Has a valve, strainer, and 30 degree elbow
- Has slow closing designed valves
A larger tank discharge should: - ✅✅ - Be located at left, right and rear side
- Discharge 90% of the tank volume
- Average rate of 1,000 gpm
Steering wheel should not move more than? - ✅✅ 10 degrees in either direction
Weekly inspections: - ✅✅ -Pump and intake strainers
- Gearbox and packing glands
- Dump system
During a vacuum service test, the system vacuum and pump priming device should
achieve a column of mercury or at least? - ✅✅ 22 inches
Steps for Part II pressure control test: - ✅✅ 1.) Set the fire pump to net pump
discharge pressure of 150 psi
2.) Reduce engine throttle until net pump discharge pressure drops to 90 psi
3.) Set the pressure control device to maintain the discharge pressure at 90 psi
4.) Close the flowing valves one at a time
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