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
