IFSTA 10 Operating Fire Pumps Flashcards
The process for making the fire pump operable begins with what?
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After the apparatus has been properly position in the parking brake has been set
on the majority of apparatus the procedure for making the pump operation takes place where
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Before the driver exit to the cab
except on the Apparatus used for pump & roll operations, what is the next step after the driver exits the cab
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Chalk the Apparatus wheels
The three possible types of water supply for the fire pump, most drivers operate solely from the ——- at the vast majority of incidents
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on board water tank
If it appears that a pump will be required to furnish more than ——-percent of his rated capacity it should be set to the parallel (volume) position from the start
what is a danger of operating at negative pressure from another pumper
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cause supply hose to collapse resulting in interruption of water supply
One possible problem with a Forward lay depends on what
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The distance from hydrant to fire and the length of hose carried on the engine
If threaded coupling’s are used in the hose bed. set up for reverse lay should be loaded so that the first coupling come off is what
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male
The reverse lay has become a standard method for setting up a —— operation when using medium diameter hose as a supply line
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relay pumping
A disadvantage of the reverse lay is what
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fire fighting equipment must be removed and placed at the fire location before the pump I can proceed to the water source
when using the percentage method determine how much more water a hydrant can supply first calculate the drop in pressure using what formula
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(static - residual)(100) / static
when using the percentage method if the percent decrease of the pump or intake pressure is between zero and 10 how much more additional water is available
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3 additional lines of the same flow
when using the percentage method if the percent decrease of the pump and take pressure is between 16 and 25 how much more additional water is available
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One additional line of the same flow
when using the first digit method for calculating available water, if the psi drop is equal to or less than the first digit of the static pressure multiplied by one how much more additional water is available
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Three additional lines of the same flow
when using the first digit method for calculating available water if the psi drop is equal to or less than the first digit of the static pressure multiplied by two how much more additional water is available
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Two additional lines of the same flow
when using squaring the lines method for calculating available water score of the number of lines currently flowing and multiply this by what?
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The original pressure drop
what three factors affect the selection of a drafting site
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Type of water
amount of water
accessibility of water
what is the most important factor in the choice of a draft site
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Amount of water available
Low level strainers are designed to sit directly on the bottom of the tank or pool and are capable of allowing water to be drafted down to the depth of what
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2”
below ——- degrees in Fahrenheit or above ——- degrees in Fahrenheit may adversely impact the pumps ability to reach capacity
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35/90
pumping —— water can be harmful to the pump
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non potable (untreated)
The entire priming action typically requires —— seconds from the start to finish
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10-15
Water supply for sprinkler systems is designed to supply —— of the total number of sprinklers on the system
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Only a fraction
generally what lines should be used to support standpipe systems
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FD attack lines
which of the following is a danger of operating a negative pressure from a fire hydrant
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Increases the possibility of damage to the source pumper due to cavitation
what are three methods to move water through the pump in order to prevent overheating
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Circulator
bypass
booster
when operating from a pressurized supply source, as the discharge volume from the fire pump increases, the incoming pressure from the supply source will do what?
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Drop due to friction loss in the water system
which method of establishing a water supply is the most direct method for supplementing hydrant pressure or performing drafting operations
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Reverse lay
What are three methods to determine additional water available from a hydrant?
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Percentage method
first digit method
squaring the lines method
define pressure differential
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Effect of altering the atmosphere pressure within a confined space by mechanical means when air is exhausted from within the space a low pressure environment is created as replacement air will be drawn in
With an atmospheric pressure at sea level of 14.7 psi what is the partial vacuum read on the intake pressure gauge?
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-2psi or 4” of mercury
A pump rated at 750 gallons per minute is normally supplied with 4.5”intake hose to achieve rated capacity. when equipped with a 5 inch intake hose the capacity of the pump is increased to what?
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820 gpm
14.7 psi atmospheric pressure is equivalent to what in inches of mercury?
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30”
for every 1000 feet of elevation atmospheric pressure decreases approximately how much?
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.5”
most pumps are able to develop a vacuum capacity of how many inches of mercury?
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22”
NFPA requires pumps are able to meet their capacity during draft at an elevation of what?
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10’
A pump are in good working order can lift water at a maximum of how many feet
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25’
in order to create an effective fire stream in lift of no greater than how many feet is recommended
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20’
operating at roughly 60%
Most priming pumps are intended to work most effectively when the engine is sit at a rate between what?
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1000-1200 rpm
The master intake gauge will register vacuum readings that should be equal to 1 inch of mercury per how many feet of lift required
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1’
during priming of the pump using 20 feet of intake hose at 10 feet of vertical lift, it may take as long as how many seconds
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30
priming a pump with the capacity of 1250 GPM or more may take how long
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45 seconds
what is the most common cause of an air leak during priming operations
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An open valve or drain
what are the common causes of inability to achieve a prime
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Air leaks
insufficient fluid in priming reservoir engine speed to low
Lyft to high
a High Point an intake hose creating air pocket
when supplying a standpipe system do not exceed pump discharge pressure of —— unless the system hose and appliance has have designed to function under high pressures
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185 psi
