09 - IFSTA Chapter 09 Flashcards
In a midship mounted pump, the gear ratio is arranged so that the impeller turns faster than the engine, at what ratio?
1.5 to 2.5
With the engine idling and the pump engaged, most speedometers will indicate what miles per hour?
10 to 15 mph
(0 mph for some engines, including all engines w/ a PTO pump)
The piping system and the fire pump itself must be capable of withstanding a hydrostatic test of how much psi?
500
According to NFPA 1901, all fire apparatus must be equipped with at least two, 2.5” discharges based on the pumps rating of how many gallons per minute?
750
NFPA 1901 requires all intakes or discharges be equipped with a slow acting valve control with what diameter valve?
3” or greater
It is generally recommended that the intake relief valves be set to open when the intake pressure rises how many PSI above the necessary opering pressure?
10
A pump that consists of two gears that rotate in a tightly meshed pattern inside a watertight case is referred to as?
Rotary gear
What type of pumps are constructed with moveable elements that automatically compensate for wear, maintining a tighter fit with closer clearances as the pump is used?
Rotary vane
The ____ acts as the disk receiving its water through the eye in its center.
imepller
The volume capacity of the pump is dictated by the size of what?
Impeller
When each of the impellers takes water from a source and delivers it to the discharge, you are operating the transfer valve in what position?
Parallel
When all of the water from the intake manifold is directed into the eye of the first imepeller, you would have the transfer valve in what position?
Series
What valves are essential to the operation of a multi two stage pump?
Clapper
Due to its self adjusting feature, rotary _____ pumps are more efficient at pumping air than rotary _______.
vane; gear
Which pump does not pump a definite amount of water with each rotation?
Centrifugal
What form of energy is transmitted to the water by the impeller?
Velocity
The engine’s piping typically tapers to a square shape when entering the pump in order to eliminate what?
Vortex
What feature is designed to regulate the engine speed to match the pump discharge requirements?
Pressure Governor
The electronic governor returns the engine to idle when the intake pressure drops below what PSI?
30
The pressure control device must restrict the pressure from exceeding what PSI above the set level?
30
What does changeover mean?
swithcing between pressure and volume
When can you double your discharge pressure in a multistage centrifugal pump?
Changing from volume to pressure
What are the main pumps on new fire engines?
Centrifugal pumps
Name 2 types of postive displacement pumps.
rotary vane and rotary gear
Define centrifugal pump
A NON-displacement pump, that does not pump a definite amount of water with each revolution
This is converted to pressure in a centrfugal pump.
Water velocity
This pump panel instrument shows pressure supplied to hoseline.
pump pressure indicator / aka: discharge gauge
During pump and roll operation, it is easiest to do while?
in lowest gear
What is centrifugal pump volume capacity dependent on?
size of the impeller
The electronic governor cavitation protection will turn on returning the engine to idle when intake pressure drops below what?
30 psi
What is a type of centrifugal pump?
multistage cenrifugal pump
Where does the auxiliary engine to driven pumps get their power from?
a gas or diesel engine separate from the vehicle to drive engine
What does lantern/slinger rings provide?
Cooling between the shaft and the packing rings
This valve has the minimum amount of frictin loss.
ball type valves
You are doing what when you prime the pump to remove air from the pump
lower atmospheric pressure within the pump casing
These valves swing freely making it essential to the operation of a multistage pump
clapper valves
The hydrostataic testing of an engine piping system must be capable to withstand
500psi
engine speed in revolutions per miniute is shown on this pump panel instrument
tachometer
This valve is within the pump discharge and sensitive to pressure change
relief valve
A handwheel usually closes this valve
gate valve
This type of pump depends on the velocity of the water produced by rotational force to achieve proper PDP.
Centrifugal Pump
Although no longer used as high to capacity pumps, what type of pumps are multicylinder, PTO to driven that can provide pressures up to 1,000 psi?
Piston Pump
Which of the following would you likely NOT find a rotary pump?
Modern midship PTO pump
What type of pump has a rotor with attached vanes mounted off to center inside the pump housing?
Rotary Vane Pump
What dictates the amount of pressure that is created in a centrifugal pump?
Speed of the impeller
Which of the following is not one of the three main factors influencing a centrifugal fire pump’s discharge?
The temperature of the engine
What type of pump cannot pump air and is not self priming?
Centrifugal Pump
What type of pump is particularly susceptible to freezing temperatures due to their location on the apparatus?
Front mount Pumps
When the pump has been engaged, the DPO may notice that the speedometer goes up; what is the reading that they should expect to see?
10 to 15 MPH
The piping system, as well as the fire pump itself, must be able to withstand a hydrostatic test of what?
500 psi
According to NFPA, pumpers with a capacity of 500 gpm or less must be have piping capable of flowing how many gpm?
250
According to NFPA, pumpers with a capacity of 500 gpm or more must be have piping capable of flowing how many gpm?
500
Based on NFPA 1901, how many 2.5” discharges must be on an apparatus?
Enough to flow its rated capacity
What is the minimum size of piping that must be used for a discharge where a 1.75” hand line would be attached?
2”
All valves on an apparatus must be easily operable up to how many psi?
250 psi
According to NFPA 1901, apparatus with tanks less than 1,000 gallons must have a tank fill line (or tank recirculating line) of at least how large?
1”
What is the most common type of valve found on an apparatus?
Ball valve
NFPA 1901 requires an apparatus to have a pressure relief valve that operates within __ seconds of the discharge pressure rising and restricts the pressure from exceeding ___PSI above the set level.
3 to 10 seconds, 30 PSI
When these gases are prevented from escaping and diverted into a chamber creating a vacuum which is connected through a line and a priming valve to the intake of the pump, you have this type of primer.
Exhaust
When the master intake gauge reads 20 inches, what does the DPO need to be aware of?
The pump is nearing its capacity
Which self to priming pump utilizes apiston or interlocking rotors to move fluid through the pump?
Positive displacement pump
Which of the following pumps is the simplest of all fire apparatus pumps?
Rotary pumps
What pump has two gears that rotate in a tightly meshed pattern inside a watertight case?
Rotary gear pumps
What is a rotary vane pump?
Constructed with moveable elements that automatically compensate for wear
Most modern fire pumps are of this type :
Centrifugal pumps
What type of pump has a revolving disk that throws water introduced at its center toward the outer edges?
Centrifugal pumps
What is the water passage of gradually increasing size as it nears the discharge outlet of the pump called?
Volute
Which pump has an impeller for each stage mounted in a single housing?
Multistage centrifugal pump
All of the following are factors that influece a centrifugal pump’s discharge pressure except:
Kinks on the hoseline
What do most manufacturers recommend especially in cold weather ?
Drain pump between fire calls
What are hydrostatic pumps used for?
Auxiliary systems like CAFS and generators
Which apparatus offers even distribution on the chassis and more compartment space?
Rear mount pumps
According to NFPA 1901, pumpers with capacity of 500gpm or less should have piping capable of flowing?
250gpm
Which device in the pump prevents damage to the tank if the tank to pump valve opens inadvertently?
Check valve / Clapper valve
Based on NFPA 1901, a sufficient number 2 1/2 inch discharge openings must be provided to:
Flow the rated capacity of the pump
All fire apparatus with rated pump capacity of 750gpm or greater must be equipped with at least what?
Two 2 1/2 inch discharges
According to NFPA 1901, What diameter should the tank fill line be in tanks greater than 1,000 gallons?
2 inch
When operating the pump and is overheating with no thermal relief valve present, What should the driver/operator do?
Use tank fill line
What is the booster line cooling valve also called?
Bypass valve
NFPA 1901 requires that all intakes and discharges that are 3 inches or greater, be equipped with what device?
Slow acting valve
What kind of fire pumps are most modern fire department pumpers equipped with?
Centrifugal
From a stanpoint of design, what is the simplest type of fire pump?
Rotary
Rotary pumps are prone to failure if not exercised regurarly. When shall they be operated?
During routine apparatus checks
What is one of the most common type of pump used to prime centrifgual fire pumps?
Rotary vane
Centrifugal fire pumps are classified as what type of fire pump?
Nonpositive displacement
What are the two basic types of centrifugal fire pumps?
Single stage, multistage
When pumping in series on a multistage pump, the first stage increases the pressure and discharges approximately what percent of the volume capacity into the second impeller?
50 to 70 percent
Power operated transfer valves operate at pressures as high as what?
200 psi
What is essential to the operation of a multistage pump?
Clapper valves
A very close tolerance must be maintained between the pump casing and the hub of the impeller. What is the tolerance usually limited to?
0.01 inches or less
Auxiliary engine driven pumps generally have a pumping capacity of what?
500 gpm
Where are PTO driven fire pumps most common?
Initial attack vehicles
A front mount pump typically has a maxium pumping capacity of?
1,250 gpm
When the pump is engaged and idling, what will most speedometers read?
10 to 15 mph
According to NFPA 1901, what must all piping componenets be made of?
Corrosion resistant material
The fire pump and the piping itself must be able to withstand a hydrostatic test up to what psi before being palced in service?
500 psi
Pumpers with a capacity of 500 gpm or less should have piping capable of flowing what gpm?
250 gpm
Where are all intake lines generally located on a centrifugal fire pump?
Below the eye of the impeller
Front and rear intakes should be considered what type of intakes?
Auxiliary
All valves should be designed and maintained so that they are easily operable at what pressure?
250 psi
Define positive placement pumps
pumps that deliver a definite volume of water or air and exhaust air from the pump to deliver weather
modern day fire apparatus contain a positive displacement pump that is generally used for:
priming pump
Most modern day fire apparatus are equipped with:
centrifugal pump
What is the simplest form of all fire apparatus pumps?
rotary pumps
How does a priming device get water into a centrifugal pump?
removing air
The total amount of water that can be pumped by a rotary gear pump depends on:
the size of the pockets in the gears
What is the main pump used on all modern day fire apparatus?
Centrifugal pumps
Centrifugal pumps are classified as:
non positive displacement pumps
Centrifugal pumps impart:
velocity to create pressure
Which of the following pumps is the most efficient at pumping air?
rotary vane pumps
What part of the pump dictates the amount of pressure that is developed?
the speed of the impeller
Which of the following does not dictate the influence of centrifugal fire pumps discharge pressure?
the size of the discharge orifice
When pumping in the parallel position, each of the impellers is capable of delivering its rated pressure:
while flowing 50% of its rated capacity
If there is any question as to the correct position for the transfer valve, it is best to operate in the parallel position rather than the series position which allows the pump to pump at:
100% of its rated capacity at 10 feet of vertical lift and 20 feet of suction hosing
Rear engine PTO designs are driven from:
the engines flywheel
Most fire departments operate pumpers that feature a pump that is mounted:
laterally across the frame
Midship mount pumps operate by shifting the collar inside the gear box so that power can be diverted:
from the rear axel and transmitted to the fire pump
Midship mount pumps operate by shifting the collar inside the gear box so that power can be diverted:
from the rear axel and transmitted to pump drive gears
When the engine is at idle and the pump is engaged, the speedometer will indicate:
10 to 15 mph change
When using a static water source, prime the pump by removing all the air from the pump which:
lowers the atmospheric pressure within the pump casing
A self to priming pump that utilizes a piston or interlocking rotors to move a given amount of fluid through the pump chamber with each stroke of the piston or rotation of the rotors is known as what?
A positive displacement pump
Modern fire department pumpers are equipped with what kind of pumps?
Centrifugal pump
A pump with one or more impellers that rotate and utilize centrifugal force to move water is known as what?
A centrifugal pump
What is a vaned, circulating member of the centrifugal pump that transmits motion to the water?
Impeller
What kind of pump is a centrifugal pump classified as?
A nonpositive displacement pump
A sprial, divergent chamber of a centrigfual pump in which the velocity energy given to water by the impeller blades is converted into pressure is known as the what?
Volute
What are the two basic types of centrifugal pumps?
Single stage and multistage
Which of the following does NOT influence a centrifugal pumps discharge pressure?
Distance of the discharge from the pump
A single stage centrifugal pump may produce flow capacities as high as what?
2250 GPM
Switching from “volume” to “pressure” mode can result the pressure of the hoseline immediately becoming __ from the previous discharge pressure?
Doubled
If there is any question as to the correct position for the transfer valve, it is best to operate in __ mode rather than __?
Volume; pressure
What replaceable item is used to restore the pumping capacity without replacing the entire pump?
Wear rings
If a pump is operated dry for any length of time, damage to what may result?
The shaft
A mechanism that allows a vehicle engine to power equipment such as a pump, winch, or portable tool, and is typically attached to the transmission is what?
A PTO system
The most commonly operated and mounted pump used by fire departments is what?
Midship pump
Per NFPA 1901, pumpers with a capacity greater than __ should be able to flow at least __ GPM.
500; 500
The primary intake into a fire pump is through what kind of piping?
Large to diameter
Per NFPA 1901, pumps with a rated capacity of over 750 GPM must have at least how many 2” discharges?
Two
Intake relief valves should be set to open when the intake pressure rises more than how much above the necessary operating pressure?
10 PSI
Pump panel gauges are usually calibrated to what range of positive pressure?
0 to 600 PSI
What is a self to priming pump that utilizes a piston or interlocking rotors to move a given amount of fluid through the pump chamber with each stroke of the piston or rotation of the rotors called?
Positive displacement pump
What is the main pumping unit on fire apparatus called?
Centrifugal pump
From the standpoint of design what pumps are the simplest of all fire apparatus pumps?
Rotary pump
What is a hinged valve permits the flow of water in one direction only called?
Clapper valve
How does the driver/operator check for excessive pump temperature manually?
Place hand on the direct pump intake pipe
According to NFPA 1901 pumpers with a capacity of 500 GPM or less should have a piping capable of flowing what?
250 GPM
As a minimum, all fire apparatus with a rated pump capacity of 750 GPM or greater must be equipped with at least how many 2.5” discharges?
2
All valves should be designed and maintained so that they are easily operable at pressures of up to how many PSI?
250 PSI
According to NFPA 1901, apparatus equipped with tanks of less than 1,000 gallons must have a tank fill line of at least what size?
1 inch
What pressure control device controls engine speed, eliminating hazardous conditions that result from excessive pressures?
Pressure governor
What is a condition in which vacuum pockets form due to localized regions of low pressure at the vanes in the impeller of a centrifugal pamp, causing vibrations, loss of efficiency, and possibly damage to the impeller?
Cavitation
The electric governor features cavitation protection by returning the engine to idle when intake pressure drops below what PSI
30
A priming device is needed to create what that makes drafting possible?
Vacuum
Primers fall into the following catagories except what?
Suction
Most new pumpers are equiped with what type of primer?
Oil to less
What type of primer is generally found on skid to mounted pumps or older fire apparatus?
Exhaust
What physical law states that when a fluid, such as water or air, is forced under pressure through a restricted orifice?
Venturi effect
The master intake gauge is usually calibrated from what to what of positive pressure?
0 to 600 PSI
When the vacuum reading approaches what, the pump is nearing its capacity and is not able to supply additional lines?
20 inches
What device is used for measuring existing voltage in an electrical system called?
Voltmeter
What are the marine and immersion devices?
Auxiliary cooling device
When this device is used, the cooling system should be flushed as soon as possible?
Radiator fill valve
This cooler features a number of small tubes surrounded by a water jacket that is connected to the discharge of fire pump:
Marine cooler
In which system the water supplied by the fire pump passes through a coil or tubing?
Immersion system
What allows the driver to control the amount of pressure that the fire pump supplies to the discharge?
Engine speed
Which is most accurate when, the pressure being reported is the pressure actually supplied to the hoseline after the valve?
Discharge gauges
What does NFPA 1901 allows to substitute for individual pressure discharge gauges?
Flowmeters readouts
This indicates the status of the vehicle’s alternator and charging system?
Ammeter
This may occur during prolonged periods of operation in which no water is discharged:
Pump overheat
What indicates wear in the pump and possible need for repair if this is required to pump the rated capacity?
Gradual increase of rpm
What happens as the flow from the pump increases and more negative pressure is requred to overcome FL?
Vaccum reading increases
What uses a compressor to supply an airline to a jet pump that creates a venturi effect?
Air prime system
Which priming device requires a great deal of maintenance to remove the carbon deposits?
Exhaust primers
This primer works best at low engine rpm:
Vacuum primers
Rotary vane and rotary gear are what type of primers?
Positive displacement primers
In general, what is the preferred engine speed for priming?
1,000 to 1,200 rpm
The pressure governor uses this that is connected to the discharge manifold?
Pressure transducer
What device is designed to regulate the engine speed to match the pump discharge requirement?
Pressure governor
This is the psi recommended that the intake relief valves be set to open when intake pressure rises:
10 psi
What device must operate within 3 to 10 seconds after discharge pressure rises and restrict the pressure from exceeding 30psi?
Automatic pressure control
What dictates the volume capacity of a centrifugal pump?
Size of impeller
What part of a centrifugal pump transmits energy in the form of velocity to the water?
Impeller
All valves should be desiged and maintained so that they are easily operable at pressures of up to what?
250 PSI
In which pumping position does all the water from the intake manifold get directed into the eye of the first impeller?
Pressure
What is the process of switching between pressure and volume referred to as?
Changeover
Intake relief valves are generally set to open when intake pressure is more than how much above the necessary operating pressure
10 PSI
What is the spiral, divergent chamber of a centrifugal pump in which the velocity energy given to water by the impeller blades is converted into pressure?
Volute
With midship pumps, what speed may register on the speedometer to ensure the pump is operating in the correct gear?
10 to 15 mph
The casing of the centrifugal pump collects the water and converts the velocity into what?
Pressure
The piping system and the fire pump itself must be capable of withstanding a hydrostatic test of what, before being placed in service?
500 PSI
As a minimum, fire apparatus with a rated pump capacity of 750 GPMs or greater must be equipped with how many 2 1/2 inch discharges?
2
What is the most common valve that permits the full flow of water through a line with a minimum friction loss?
Ball to type valve
What is the most common actuator for a ball to type valve?
Push to pull handles or quarter to turn handles
What is designed to regulate the engine speed to match the pump discharge requirements?
Pressure governor
What is the purpose of slow acting valve controls preventing the valve from opening or closing in less than 3 seconds?
Minimize risk of damage caused by water hammer
An air priming system uses the compressor to supply an airline to a jet pump that creates what effect, that primes the pump using no moving parts or lubricants?
Venturi
Pressure control devices must operate within 3 to 10 seconds after the discharge pressure rises and restrict the pressure from exceeding how much above the set level?
30 PSI
In general, what is the preffered engine RPM to activate the primer?
1,000 to 1,200 RPM
What is the most common primer, using small versions of both the rotary vane and rotary gear type pumps?
Positive displacement primers
What can result from switching from volume to pressure modes in a multistage centrifugal pump?
Discharge pressure can double
Modern fire department pumpers are equipped with a?
centrifugal pump as their main fire pump
The simplest of all fire apparatus pumps from the standpoint of design is the?
rotary pump
The total amount of water that can be pumped by a gear pump depends on the speed of rotation and the size if the?
pockets in the gears
Which of the following is one of the most common type of pumps used to prime a centrifugal pump?
rotary vane pump
The centrifugal pump moves water and converts it to pressure within the pump itself creates?
velocity
What part of the centrifugal pump transmits in the form of velocity to the water?
impeller
Which part of the centrifugal pump collects water and confines it in order to convert the velocity to pressure?
casing
The volume capacity of the centrifugal pump is directed by the?
size of the impeller
Which of the following is constructed with a single impeller and may consist of front mount pumps, PTO, and midship pumps?
single stage centrifugal pumps
Which of the following centrifugal fire pumps has an impeller for each stage mounted within a single housing?
multistage centrifugal pump
Which of the following are essentials to the operation of a multistage pump and should be allowed to swing freely?
clapper valves
Wear rings or clearance rings in a pump casing may be replaced to maintain preferred spacing between the pump casing and?
the hub of the impeller
Which of the following valves on newer model centrifugal pumps opens to allow overheated water to circulate between the pump and the main water tank?
thermal relief valve
Which of the following provide cooling between the packing rings and shaft?
lantern rings
Damage to the shaft can occur if the pump is operated?
dry for any length of time
Which pumps are powered by a gasoline or diesel engine independent of the vehicle drive motor?
auxiliary pump
Before being placed into service, piping systems must be capable of withstanding a hydrostatic test of?
500 psi
Pumpers with a capacity of 500 gpm or less should have intake piping capable of flowing?
250 gpm
Pumpers with a capacity greater than 500 gpm should have intake piping capable of flowing?
500 gpm
All discharge valves should be designed and maintained so that they easily operate at pressures up to?
250 psi
What type of self to priming pump uses a piston or rotors to move a given amount of fluid through the pump chamber?
Positive Displacement Pump
What does the amount of water that can be pumped by a rotary gear pump depend on?
The size of the pockets in the gears and speed of rotation
How is a centrifugal pump classified?
Nonpositive displacement pump
What is considered the vaned circulating member of the centrifugal pump that transmits motion to the water?
Impeller
What is the intake orifice at the center of a centrifugal pump impeller called?
Impeller Eye
What are the two types of centrifugal pumps used by the fire service called?
Single to stage and multistage
When pumping in series, how is the output of water affected as the pressure is increased?
Decreases
What can result if the pump mode is switched from volume to pressure?
Immediate doubling of the previous discharge pressure
How many directions does a clapper valve allow water to flow?
1
What occurs if a pump is operated dry for any length of time?
Damage to the shaft
What allows a vehicle engine to power equipment (i.e. a pump, winch, tool etc.) and is attached to the transmission usually?
PTO System
Before being able to pump after the pump is engaged, what must a driver do in a midship pump?
Put the transmission in the appropriate gear
While engaging the pump, what gear must the transmission be in?
Neutral
NFPA 1901 requires the components of the piping systems be made of what?
Corrosion resistant material
What must fire apparatus pumps be capable of being supplied from?
External pressurized and static sources
If a pumper is rated at 750gpm or greater, how many 2 1/2” discharges are required according to NFPA 1901?
2
According to NFPA 1901, what is the minimum diameter of a tank to fill line if the booster tank is less than 1000 gallons?
1”
NFPA 1901 requires there be a slow acting valve control for what size intake or discharge?
3” or greater
What controls the engine speed which can eliminate hazardous conditions that result from excessive pressures?
Pressure Governor
What device is needed to create a vacuum in the pump to allow for drafting operations?
Priming device
What part of the centrifugal pump collects water to convert the velocity to pressure?
casing
What PSI must a piping system be capable of withstanding during a hydrostatic test?
500psi
Wht is the best gear to operate a PTO driven fire pump?
lowest gear
What is the process of swithcing between pressure and volume called in a multistage pump?
changeover
What seal does not require periodic adjustments?
mechanical seals
What can be tightened to control leaks when packing rings wear ?
packing gland
What consist of 2 gears that rotate in a tighly meshed pattern inside a water tight case?
rotary gear pump
What does pump pressure indicator indicate?
actual pressure to hoselines
how much pressure can discharge valves hold up to?
250 psi
What automatic pressure control devices relieve excess pressure within the pump?
relief valves
what pump panel display indicates water level in tank?
water tank level indicator
what is the simplest fire pump ?
rotary pump
what should intake relief valves be set at?
10 psi above pressure
What pressure control device uses a pressure sensing element?
electronic governor
how does the pump have to be run where damage can happen to the shaft?
dry for any length of time
Where does a circulator valve dump water?
into the tank or on the ground
what auxiliary cooling device use coil or tubing mounted inside the cooler to immerse in coolant?
immersion type auxiliary cooler
what does a centrifugal pump have for each stage mounted within a single housing?
impeller
what valves most often use a handwheel?
gate valves
what valve is essential for multistage pump that must swing freely?
clapper vavle
What is the main pumping unit on fire apparatus?
centrifugal pump
positive displacement pumps continue to serve a vital role on modern apparatus because of their ability to pump
air and foam
This pump operates using a piston that moves back and forth in a cylinder
piston pumps
PTO to driven pumps can provide pressures up to
1,000 psi
the simplest of all fire apparatus pumps
rotary pumps
These pumps are driven by either a small electric motor or through a clutch that extends from the apparatus drive shaft
rotary pumps
consist of two gears that rotate in a tightly meshed pattern inside a watertight case
rotary pumps
one of the most common types of pumps used to prime a centrifugal fire pump
rotary vane pumps
constructed with moveable elements that automatically compensate for wear, maintaining a tighter fit with closer clearances as the pump is used
rotary vane pumps
The self to adjusting feature makes what pump much more efficient at pumping air than a rotary gear pump?
rotary vane
Nearly all modern fire apparatus feature what kind of pump as their main pump?
centrifugal
This pump is classified as a nonpositive displacement pump as it does not pump a definite amount of water with each revolution. The pump imparts velocity to the water and converts it to pressure within the pump itself.
centrifugal
The operation of a what kind of pump is based on the principle that a rapidly revolving disk tends to throw water introduced at its center toward the outer edges of the disk?
centrifugal
Acts as the disk receiving its water through the eye in its center
the impeller
Vaned, circulating member of the centrifugal pump that transmits motion to the water.
the impeller
Intake orifice at the center of a centrifugal pump impeller
impeller eye
water is thrown out to the what around the outside edge of the pump housing?
volute
The speed at which the impeller rotates is a ratio based upon the
power train configuration
The volume capacity of the pump is dictated by the size of the
impeller
Spiral, divergent chamber of a centrifugal pump in which the velocity energy vigen to water by the impeller blased is converted into pressure
volute
A self priming pump that utilizes a piston or interlocking rotors to move a given amount of fluid through the pump chamber is called?
Positive displacement pump
A positive displacement pump using 1 or more reciprocating pistons to move water is called?
Piston pump
This type of positive displacement pump is commonly used in hydraulic systems?
Rotary vane
A pump with 1 or more impellers to move water?
Centrifugal
A vaned, circulating member of the centrifugal pump that moves water?
Impeller
Intake orifice at the center of a centrifugal pump impeller?
Impeller eye
Spiral, divergent chamber that creates velocity for water is?
Volute
Switching from volume to pressure can result in what?
Doubling previous discharge pressures
Hinged valve that permits the flow of water in one direction?
Clapper valve
Automatic valve that permits liquid to flow in 1 direction?
Check valve
This allows a small running clearance between the impeller and the pump casing?
Wear rings
This mechanism allows a vehicle engine to power wenches, pumps and generators?
PTO
The ability of an apparatus to pump water while the vehicle is in motion is called?
Pump and roll
A pressure control device that controls engine speed, eliminating hazardous conditions from excessive pressure?
Pressure gooney
A condition in which vacuum pockets form due o low pressure at the vanes in the impeller causing vibrations, loss of efficiency and possible damage?
Cavitation
A device used to exhaust air from a pump hooked up to hard sleeve ?
Priming device
This type of primer is environmentally friendly?
Oil less
This type of primer is generally found on skid mounted pumps or older fire apparatus?
Exhaust
This primer if found on apparatus with a gasoline driver engine?
Vacuum
A system that uses the compressor on the engine to supply to the jet pump to create a venturi effect?
Air primer
What are known as constant flow machines and produce the same flow at a given speed regardless of discharge pressure?
Positive Displacement Pump
What type of pump uses one or more reciprocating pistons to force water from the pump?
Piston Pump
What type of pump is confined to small capacity, booster to type pumps; low volume, high to pressure pumps; and priming pumps?
Rotary Pump
What type of pump is constructed with moveable elements that automatically compensate for wear, maintain a tighter fit with closer clearances as the pump is used?
Rotary Vane Pump
What type of pump is classified as a nonpositive displacement pump as it does not pump a definite amount of water with each revolution?
Centrifugal Pump
What is the vaned, circulating member of the centrifugal pump that transmits motion to the water?
Impeller
What is the term for the intake orifice at the center of a centrifugal pump impeller?
Eye
What is the term for the spiral, divergent chamber of a centrifugal pump in which the velocity given to water by the impeller blades is converted into pressure?
Volute
What type of pump is unable to pump air and is not self priming?
Centrifugal Pump
What position should the transfer valve be in for maximum pressure?
Series
What position should the transfer valve be in for maximum volume?
Parallel
What type of valve is hinged and only permits the flow of water in one direction?
Clapper Valve
What is the tolerance that must be maintained between the pump casing abd the hub of the impeller in a centrifugal pump?
.01 inch or less
What must be replaced, on a centrifugal pump, to maintain the perferred spacing between the hub of the impeller and the pump casing and restore pumping capacity?
Wear rings
What type of valve is equipped on newer centrifugal pumps and open to allow overheated water to circulte between the pump and the main water tank?
Thermal relief valve
What is the best course of action to prevent overheating on a pump not equipped with a thermal relief valve?
Ensure that water is moving through the pump at all times
What allows a vehicles engine to power equipment and is usually attached to the transmission?
Power take to off system
What will most speedometers read when the engine is idling and the pump is engaged?
10 to 15 mph
Based on NFPA 1901, all fire apparatus with a rated pump capacity of 750 gpm or greater must be equipped with how many 2 to 1/2 inch discharges?
At least two
According to NFPA 1901, tankes larger than 1,000 gallons must have a tank fill line of what size?
At least 2 inch
What type of pump depends on the velocity of the water produced by rotational force to achieve proper PDP?
Centrifugal Pump
What type of pumps are multicylinder, PTO to driven and can provide pressures up to 1,000 psi?
Piston Pump
Which of the following would you likely NOT find a rotary pump?
Modern midship PTO pump
What type of pump has a rotor with attached vanes mounted off to center inside the pump housing?
Rotary Vane Pump
What dictates the amount of pressure that is created in a centrifugal pump?
Speed of the impeller
Which of the following is not one of the three main factors influencing a centrifugal fire pump’s discharge?
The temperature of the engine
What type of pump cannot pump air and is not self priming?
Centrifugal Pump
What type of pump is particularly susceptible to freezing temperatures due to their location on the apparatus?
Front mount Pumps
When the pump has been engaged, the DPO may notice that the speedometer goes up; what is the reading that they should expect to see?
10 to 15 MPH
The piping system, as well as the fire pump itself, must be able to withstand a hydrostatic test of what?
500 psi
According to NFPA, pumpers with a capacity of 500 gpm or less must be have piping capable of flowing how many gpm?
250
According to NFPA, pumpers with a capacity of 500 gpm or more must be have piping capable of flowing how many gpm?
500
Based on NFPA 1901, how many 2.5” discharges must be on an apparatus?
Enough to flow its rated capacity
What is the minimum size of piping that must be used for a discharge where a 1.75” hand line would be attached?
2”
All valves on an apparatus must be easily operable up to how many psi?
250 psi
According to NFPA 1901, apparatus with tanks less than 1,000 gallons must have a tank fill line (or tank recirculating line) of at least how large?
1”
What is the most common type of valve found on an apparatus?
Ball valve
NFPA 1901 requires an apparatus to have a pressure relief valve that operates within how many seconds of the discharge pressure rising and restricts the pressure from exceeding how many PSI above the set level?
3 to 10 seconds, 30 PSI
What type of primer prevents gasses from escaping and diverts them into a chamber creating a vacuum which is connected through a line and a priming valve to the intake of the pump?
Exhaust
When the master intake gauge reads 20 inches, what does the DPO need to be aware of?
The pump is nearing its capacity
