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63 Cards in this Set
- Front
- Back
The first step that all driver/operators must take in order to begin any pumping operation?
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Make the fire pump operational
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Driver operators have what three types of water sources to choose from to supply their pump?
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- Onboard water tank
- Pressurized source - Static source |
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Tests have indicated that the apparatus may override the parking brake system at engine speeds as low as what?
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1300 rpm
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IFSTA recommends that what gets done every time an engine is left running and the driver/operator exits the cab?
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The wheels get chocked
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What is the process for engaging auxiliary engine driven water pumps?
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Starting the engine since the pump is always in gear when the engine is running.
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Of the three possible types of water supply for the fire pump, most driver/operators operate solely form what on a vast majority of incidents?
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onboard water tank
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In most cases, a multi-stage pump should be operated in what position when operating from the onboard tank?
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Series(pressure)
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Some manufacturers recommend that their pumps remain in series until u to what percentage of pump capacity is required?
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70%
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If the pump is normally full of water, what should the Master Pressure Gauge do as soon as the rpm is increased?
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The pressure gauge should start to rise.
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What should be done if RPM is increased and the master pressure gauge still fails to rise?
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Immediately decrease engine speed, return to the cab and ensure that the transmission is in the right gear and the pump shift transfer has been made.
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What are the two basic pressurized water sources?
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-Hydrant
- Supply hose from another fire pump. |
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Operating from a negative pressure can increase the possibility of what happening to the fire pump?
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Damage to the pump due to cavitation.
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To avoid possible damage to the water system, you should not let the intake pressure form a hydrant to drop below what?
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20 PSI
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What is the first consideration in selecting a hydrant?
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Which hydrant is most appropriate in terms of fire fighting and safety.
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The worst hydrants are typically located on what?
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"Dead-end mains"
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What is the NFPA standard for Recommended Practice for Fire Flow Testing and Marking of Hydrants?
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NFPA 291
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What are the two primary ways that a fir department may use a hydrant
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- Forward Lay
- Reverse Lay |
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Hydrants flow rates:
Class AA Light Blue |
1500 gpm or greater
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Hydrants flow rates:
Class A Green |
1,000-1,499 GPM
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Hydrants flow rates:
Class B Orange |
500-999 GPM
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Hydrants flow rates:
Class C Red |
Less than 500 GPM
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Dry-barrel hydrants are also called what?
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Frost Proof Hydrants
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When using 2 1/2" or 3" hoselines to supply the pumper directly off hydrant pressure, it is recommended that the lines be no longer than what?
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300'
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When using threaded couplings, what should be the first coupling off of a hosebed loaded for a reverse lay?
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Male
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When hose is laid from the fire to the water source.
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Reverse Lay
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When hose is laid from a water source to the fire.
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Forward Lay
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What is the disadvantage to reverse lays when only one company is on scene?
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There is a delay in fire attack from having to remove necessary equipment, attack lines, and waiting for the pumper to get the water source and begin pumping lines.
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The pressure shown on the intake gauge when connected to a hydrant and not flowing any hoslines.
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Static pressure
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The intake pressure gauge reading when the pumper is flowing hoselines.
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Residual pressure
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What are the three methods that can be used to calculated how much more water can be supplied?
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- Percentage method
- First-digit method - Squaring the lines method |
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What is the equation for for percentage method?
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percent drop=
(static-residual)(100) / static |
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To successfully use the Squaring-the-lines method what must you note?
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The static pressure on the water system before any of the pump discharges are open.
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In the squaring-the-lines method, you may note that the pressure drop in the system is quadrupled each time the flow rate is _______.
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doubled
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After a hydrant is closed and before the last cap is put back on, the operator should do what?
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Visually and physically check to be sure that the water is draining from the hydrant.
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The friction loss in hard intake hose is dependent on what?
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- The diameter of the hose
- The length of the hose |
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What is the maximum amount f vacuum that most pumps can develop?
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22" mercury
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Condition where, in theory, water is being discharged from the pump faster than it is incoming.
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Cavitation
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Indications that a pump is cavitating.
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- Pulsating hose streams
- Fluctuating pump on pressure gauge - Popping or sputtering as water leaves nozzle. - Pump sounds like gravel is moving through it - Lack of reaction on pressure gauge when throttle is adjusted. |
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What is the first consideration in establishing a successful drafting operation?
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Selecting a site
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If a drafting site is being selected for a water shuttle operation there may be several location choices. What factors will dictate which location to choose?
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- Amount of water
- Type of water - Accessibility of water |
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For a pumper to reach it's rated capacity using a traditional strainer, it is desirable for it to have how much space all around the strainer?
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2 feet
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What can be done to prevent a whirlpool over a strainer in a drafting operation?
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Place an object that floats over the strainer.
i.e. wooden board, capped plastic bottle, beach ball |
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Low level strainers are capable of allowing the water to be drafted down to what depth?
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about 2"
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What should be done anytime that corrosive or nonpotable water has been pumped?
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The pump should be flushed wit fresh water
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As the amount of lift increases, what occurs when drafting through hard intake hose?
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- Elevation pressure increases
- Less friction loss can be overcome - Capacity of the pump is decreased |
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At 20ft of lift, the amount of water that can be supplied is only about __% of the rated cpacity of the pump.
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60%
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Why would it be necessary to remove the intake valve on a drafting operation?
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If it is a butterfly valve, it will obstruct the waterway and reduce the drafting capacity.
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The priming action should not be stopped until what has happened?
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All the air has been removed and the pump s discharging a steady stream of water.
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The entire priming action typically requires how long from start to finish?
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10-15 seconds
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What could cause the priming action to take longer than normal?
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- More than 20 ft of hard suction
- 10ft or more of lift - Pumps larger than 1250GPM |
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If prime hasn't been achieved in 30 seconds, what should be done?
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stop priming and check t see what the problem is.
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What is the most common cause of inability to prime?
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Air leak that prevents primer from developing enough vacuum.
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If no air leaks are found, what else could be possible causes for inability to prime?
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- Insufficient fluid in the priming reservoir
-Engine speed is too low - Lift is to high - A high point in the hard intake hose creating an air pocket |
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Why should a small line be left discharging when running a drafting operation?
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When no water is being discharged, even the smallest air leak may result in a loss of vacuum.
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Problems that occur while operating from draft fall into one of what three categories?
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- Air leak on the intake side of the pump
- Whirlpool allowing air to enter the pump - Air leakage due to defective packing in the pump |
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While the pump is operating in a draft, a gradual increase in the vacuum reading may be noted with no change in flow rate. What is this an indication of?
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A blockage developing
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Where is the most common place for a blockage to develop in a drafting operation?
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At the strainer
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FDC consist f what in order for the pump to be connected?
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A siamese with at least two 2 1/2" female connections or one LDH sexless connection that is connected to a clapper inlet.
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It is a rule of thumb that one 1,000gpm rated pumper should supply the FDC for every __ sprinklers that are estimated to be flowing.
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50
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It is general rule of thumb to discharge ___psi into the FDC.
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150psi
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Add approximately _psi to the desired nozzle pressure for each floor above the standpipe connection that will have operating fire streams.
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5psi
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Pump discharges in excess ___psi are not encouraged unless the standpipe system has been designed to withstand those higher pressures.
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200psi
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When standpipe is equipped with pressure-reducing valves, the elevation pressure should be based on what?
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Total height of the standpipe
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