10 - IFSTA Chapter 10 Flashcards
Which of the following can be opened in order to prevent the pump from over heating?
Circulator, bypass, or booster cooling valve
The two basic pressurized water supply source included supply hose from another pumper and?
A fire hydrant
Which of the following BEST decribes pumping at a low residual pressure (below 20 psi) while being supplied by other apparatus?
Dangerous
When choosing a hydrant the least desirable hydrant is typicaly located on?
Dead end mains
What is one of the most common ways for a pumper to be supplied with water from a hydrant?
Forward lay
What type of pressure is being displayed on the intake gauge when the pumper is discharging water
Residual
Which of the following BEST decribes how valves should be closed when shutting down the hydrant?
Slowly and smoothly
Most pumps are able to develop a vacuum capacity of approximately how many inches of Mercury?
22 inches of Mercury (Hg)
What is the optimal RPM speed of the pump when drafting?
1000-1200 RPM
How much water should be above a traditional strainer in order for a pump to approuch its rated capacity during drafting operations?
At least 24 inches
Which of the following items placed above the strainer may lessen the chance of a whirpool during drafting operations
Capped plastic jug
Which of the following is the appliance of choice when drafing from a swimming pool?
Low Level Strainer
During drafting operations water below 35 degrees and above 90 degrees may impact the abilty of the pump to?
Reach capacity
To create an effective fire stream during drafting operations, a lift of no greater than _____________ is recommended.
20 feet
Which of following is the most common cause of an air leak when priming the pump?
Open drain or valve
What is the most common place for blockage during drafting operations?
At the strainer
If no specific information is available when supplying a sprinkler system via a fire department connection, the general guidelines is to discharge:
150 PSI
Which of the following standpipe system is MOST likely to be used as the hoseline is stretched and the valve is opened?
Wet
Generally, the friction loss in a standpipe is___________ unless the flows very large.
Small
When troubleshooting during pumping operations you should use___________ to trace the problem to its source.
Logical Process
What is one of the most common ways for a pumper to be supplied with water from a hydrant?
Forward hose lay
Which hydrant mains are least desirable?
Dead-end mains
What should the driver/operator record before they begin to pump?
Static pressure
Why do some fire departments use a four-way hydrant valve?
It allows a second arriving pumper to be connected without interupting the flow, and boost the pressure in the original supply line.
Which method of laying hose starts at the fire scene and ends at the water source?
Reverse lay
Why are newer model pumpers equipped with a check-valve in the tank-to-pump line?
To prevent water from entering the tank under pressure from the pump intake
When a pumper is discharging water, what is the intake gauge displaying?
Residual pressure
What is the atmospheric pressure at sea level?
14.7 psi
What is the first consideration in establishing a draft site?
Site Selection
What is the most important factor in choosing a draft site?
The amount of water available
For a pumper to approach its rated capacity using a traditional strainer, how much water must be over the strainer?
24 inches
All fire pumps meeting NFPA and UL Inc. requirements are rated to pump their capacity at how many feet of lift?
10 feet
While working with 20 feet of lift, the pump operates at what percentage of its capacity?
60%
What is anoter mthod that may be used to employ a Venturi effect to achieve water movement during drafting operations?
Jet siphon
How long does the typical priming action take?
10-15 seconds
While the pump is operating, a gradual increase in the vacuum with no change in the flow rate is an indicator of what?
Blockage
When drafting with a two-stage pump, the transfer valve must be in what position?
Parallel
When supplying a standpipe, multistage pumps should be operated in what position?
Parallel
Many manual standpipe systems are designed to be pumped at what pressure?
150 psi
If you increase the throttle and open the appropriate valves but the pump does not develop pressure, what would be the first step to troubleshoot?
Ensure pump is properly engaged
what 3 sources to supply the pumping operation?
onboard water tank, fire hydrant and static water source
What does IFSTA recommend every time a driver/operator leaves the cab?
chocking the wheels
What can be done to keep air from filling the pump during a transitioning to a supply source?
open the bleeder valve on the gated intake
What is the least desirable hydrants to use?
dead end mains
what does 12% mean using the percentage method for water supply?
2x the amount being delivered
How should changes in water flow happen to avoid water hammers?
slowly and smoothly
Name 3 methods to finding how much additional water is available from a hydrant.
percentage method, first digit method and squaring-the-lines method
What do you create when pumping from a static source and evacuate some of the air inside the pump?
pressure differential (partial vacuum)
What is a hard intake hose considered?
a noncollapsible waterway
What is atmospheric pressure at sea level?
14.7 psi
What is the vacuum capacity of most pumps?
22 inches of mercury
What is happening when you hear the sound of gravel in the pump and pressure gauge is fluctuating?
cavitation
What distance do you need around a traditional strainer?
24 inches
What strainer do you use drafting from a pool or tank?
low level strainer
what do you clean the pump and piping with after using nonpotable water?
fresh water soon after
What is the max a pumper can lift water?
25 ft
What rpm do most priming pumps work best at?
1000-1200 rpm
What can be placed above a drafting strainer if a whirlpool develops?
a beach ball or floating object
What is the most common source of problems while operating a draft?
air leak on intake side of pump
What is the starting pressure of a FDC connection to a standpipe?
150 psi
What is the initial water source on a supression call?
Apparatus water tank
What is the first step that must be done after putting an apparatus in pump gear?
Put down wheel chocks
If there is not an established water supply, what does the DPO need to ensure before they open the valves to send water to attack lines?
Make sure the tank-to-pump is open
If there is not water flowing for an extended period of time, what should the DPO be concerned about?
The pump overheating
Which of the following is not a preferred method of keeping the pump from overheating?
Spraying the engine with water
After connecting the supply line, what should the DPO ensure is open before calling for water?
The air bleeder for that line
Which of the following is not a pressurized water source that a DPO might encounter?
A dry hydrant
Pumping at a low residual pressure while being supplied by another apparatus can be dangerous, what is the minimum pressure the DPO should maintain to avoid supply line collapse?
20 psi
What is the definition of a “dead end main”?
A less desirable hydrant served by smaller mains from only one direction
In this type of lay, one of the risks is running out of LDH before the apparatus gets to the scene.
Forward Lay
In this type of lay, the driver reports to the incident scene first to size up the incident before laying supply line.
Reverse Lay
Regardless of whether an apparatus has a check valve in the tank-to-pump, what should the DPO ensure once they are fully transitioned to an external water supply?
The tank-to-pump is closed
If a DPO uses the percentage method to find their available water and they get a 13% drop, how much more water are they able to supply?
2 times the amount being delivered
If a DPO is flowing 200 gpm, has 90 psi for their static pressure, and the residual pressure is reading 80 psi, how many more gpm can they flow?
2 times the amount being delivered
If a DPO is flowing 250 gpm, has 50 psi for their static and has 35 for their residual, how many more gpm can they flow?
More water might be available but not as much as being delivered
When should the pump be disengaged when shutting down operations?
After the lines are closed and the engine is in idle
What is the atmospheric pressure at sea level?
14.7 psi
Most pumps are able to develop a vacuum capacity of how many inches of mercury?
22
How many inches of water should be above a traditional strainer?
24”
A low level strainer will effectively draft down to a depth of what?
2”
What two actions need to happen before a fire pump is operational?
Position properly, Set parking brake
What should the driver/operator do when water supply or pumping ability may be unattainable or interrupted?
Notify the incident commander
An aerial device may be used to create what using its pre-piped waterway?
External Standpipe
At what pressure many manual standpipe systems are designed to be pumped?
150psi
When the standpipe is charged, water will be discharged at all points where:
Caps are off & valve is open
How is the friction loss generally in the standpipe?
Small
Which standpipe system can be used as soon as a hoseline is streched and the valve is opened?
Wet pipe system
When supplying a standpipe, 25psi pressure loss will be needed for flows :
350gpm and higher
When should the driver/operator pump 150psi into the FDC?
When specific information is unavailable
Sprinkler systems are designed to support the flow of a specific number of sprinklers based on:
Hazard been protected
What is an indication when a gradual increase in the vacuum may be noted with no change in the flow rate?
A blockage is developing
What often is the cause of a blockage during a draft?
After the pump has been operating at a high rate of discharge
All of the following are problems that may occur during drafting operations except:
A steady stream is flowing
When should the throttle setting be slowly increased before attempting to open any discharges?
After succesfully priming the pump
What device may be used as another method of employing a venturi effect to achieve water movement during drafting ops.?
A jet siphon
A pumper in good working condition can lift water to a maximum of how many feet?
25
What is the most important factor in choosing a drafting site?
Amount of water available
What is the surest indication of pump cavitation?
Lack of reaction on the pressure gauge to increases in the throttle
What is the approximate vacuum capacity that most pumps are able to develop?
22 inches of mercury
Which is the formula to find Percent drop?
(Static-residual)/100/static
When does putting the pump in gear begin?
After apparatus is properly positioned and parking brake set
When does IFSTA recommend chocking the wheels?
Everytime the driver/operator exits the cab
Driver/operators should maintain a residual pressure of at least what?
20 psi
What type of hydrant is the least desirable?
Dead end hydrant
What is one of the most common ways for a pumper to be supplied with water from a hydrant?
Forward lay
When using 2 1/2 inch or 3 inch hose lines to supply a pumper, what should you do?
Keep the distance as short as possible
When making a reverse lay and using hose with threaded couplings, what coupling is to come out of the hose bed first?
Male coupling
When is it not necessary to use a four way hydrant valve?
Reverse lay
When the pump is full of water and there is no water flowing, what type of pressure is shown on the master intake gauge?
Static pressure
When should the driver/operator record the static pressure?
Before he/she begins to pump
After calculating the available water using the percentage method, you get 13 percent. How much more water can you supply?
2 times the amount being delivered
What is atmospheric pressure at sea level?
14.7 psi
What is the most important factor in choosing a suitable drafting site?
Amount of water available
In order for a pumper to approach its rated capacity using a traditional strainer, how many inches of water must be surrounding the strainer?
24 inches
All fire pumps meeting NFPA and Underwriters Laboratories Inc. requirements are rated to pump their capacity at how many feet of lift?
10 feet
A pumper in good working order can lift water a maximum of how many feet?
25 feet
In order to create an effective fire stream, a lift no greater than how many feet is recommended?
20 feet
Most priming pumps are intended to work most effectively when the engine is set at what rate?
1,000 to 1,200
How long does the entire priming action typically take from start to finish?
10 to 15 seconds
What is the most common failure to a prime?
Air leak
which of the following is not considered to be a water supply according to ifsta?
fire department tender
Which of the following water sources is used as the sole water supply on many incidents?
on board water tank
If the incident requires additional water from the on board tank, the driver/operator will then transition to:
an external water source
What is the first step in putting the pump into gear?
setting the parking brake
What is the first step the pump in to operation?
open the tank to pump valve
what are the two most common types of pressurized water sources?
fire hydrants and supply hose from another pumper
The driver/operator should maintain a residual pressure of at least:
20 psi
What is the most common method for deploying supply hose to a pumper to be supplied from a hydrant?
a forward hose lay
Which of the following best describes a reverse lay?
laying hose from the fire to the water source
Which of the following best describes static pressure within a water system?
when the pump is full of water with no water flowing
What position should the transfer valve be set in when operating in a relay system?
volume or parallel mode
What is being created when evacuating the air from within the pump creating a pressure differential?
a partial vacuum
What is the atmospheric pressure at sea level?
14.7 psi
When creating pressure to acquire water from a static water source, the driver operator must evacuate some of the air from the pump and intake hose which in turn:
reduces atmospheric pressure within the pump
What is the pressure readout on the compound gauge when the a partial vacuum is created?
negative 2 psi
The ability to overcome losses in pressure is limited to:
atmospheric pressure at sea level
