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34 Cards in this Set
- Front
- Back
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Three choices of sources of water supply to the pump?
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Onboard water tank
Pressurized source Static source |
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Test have showed that the apparatus may override the parking brake system at engine speeds as low as ____rpms.
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1300 rpms
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If it appears that the pump will be required to furnish more thatn __ percent of its rated capacity, it should be set to the ________ setting from the start.
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50%
Vollume or Parallel setting |
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Some pumps can be set in the series position up to ___% of their rated capacity.
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70%
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Lite blue hydrant puts out _____gpms? What class is it?
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1500 or greater gpm
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It is not desirable to reduce the incoming pressure from a hydrant or supply pumper to get below ___ Psi.
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20 PSI
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Green hydrants puts out ___gpms? What class is it?
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1000 to 1499 gpms
A |
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Orange hydrants puts out ___gpms? What class is it?
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500 to 999 gpms
B |
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Red hydrants puts out ___gpms? What class is it?
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Less than 500 gpms
C |
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Laying from a water source to a fire is a _____lay?
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Forward Lay
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When useing 2 1/2 inch or 3 inch hoselines to supply the pumper directly off hydrant pressure, it is recommended that the lines be no longer than____ feet.
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300 feet
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What hose lay to use shen a pumper must first go to the fire location so that a size up can be made before laying a supply line?
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reverse lay
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What hose lay is the most eexpedient way to lay hose if the apparatus that lays the hose must stay at the water source such as drafting or boosting a hydrant pressure?
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reverse lay
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What hose lay is typically used for setting up a relay operation?
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reverse lay
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A disadvantages of a reverse lay? (2)
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Equipment must be in place at fire scene prior to laying supply line, may delay attack.
Also requires one pump operator to stay with the pumper at the water source preventing them from performing fire ground duties |
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When a pumper is connected to a hydrant adn is not dicharging water, the pressure shown on the intake gauge is the______ pressure.
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static pressure
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When the pumper is discharging water, the intake gauge reading is the ______ pressure.
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Residual Pressure
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Atmospheric pressure decreases ___ psi for each 1000 feet of elevation?
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.5psi
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The maximum amount of vacuum that most pumps develop is approx ___ inches of mercury.
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22 inches of mercury
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What is the term that describes the condition where water is being discharged form the pump faster than it is comming in?
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Cavitation
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Signs of cavitation
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hose streams fluctuate along with the pump pressure gauge.
a soud descrived as popping or sputtering may be heard at nozzle Pump noise such as gravel lack of reaction on the pressure guage to changes in the setting of the throttle |
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Best indication of cavitation?
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Lack of reaction on the pressure guage to changes in the setting of the throttle
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Water below ___ Degrees and above ___ Degrees may adversely impact the pumps ability to reach capacity
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35 to 90 degrees
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All fire pumps meeting NFPA reguirments are rated to pump their cpacity at ___ feet of lift.
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10 feet of lift
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The max lift considered reasonable for most fire department pumpers is about ___ feet. The amount of water that can be supplied is only about ___ percent of the rated capacity.
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20 feet
60 percent capacity |
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Should a butterfly valve be removed for drafting operations?
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yes, it can restrict the waterway and reduce capacity
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Most primer pumps work best when teh engine is set between _____ and ____ rpms?
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1000 to 1200 rpms
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A general rule of thumb is that one 1000 gpm pumper should supply the FDC for every ___ sprinklers.
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50 sprinklers
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Sprinklers are pumped at ____psi.
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150 psi
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Pump discharge pressures in excess of ___psi are not encouraged unless the standpipe has a higher design rating.
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200 psi
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When the standpipe is known to be equiped with pressure reducing valves, the eleveation pressure should be based on the ______ _______ of the standpipe or zone.
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Total hight
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Formula for a small stream
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Q=A x V x 7.5
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Formula for a small pool
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L x W x D x 7.5
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Fromula for a round pool
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Pie x R2 x D x 1000
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