08 - IFSTA Chapter 08 Flashcards
What helps Driver/operators reduce the number of calculations to determine the amount of discharge from hose lines and nozzles on incidents?
Flowmeters
Maintaining reliable flowmeters you must
Maintain in accordance with manufacturers recommendation
Flowmeters read in increments of
10 GPM (40L/min) or less.
Condensed Q fórmula works for which hose lines
3,4,5 inch
Intake pressure can not drop below
20 PSI
Electric hydraulic calculators use preprogrammed formulas to find
Pump discharge pressures
If the flowmeters are reading the proper discharge, but the nozzleman is saying he’s got low water flow. What happened?
Hose burst
Condensed Q formula for 3 inch
FL=Q^2
Condensed Q formula for 4 inch
Fl=Q^2/5
Condensed Qformula for 5 inch
FL=Q^2/15
Ways to speed up calculations on fire incident is to use
Flowmeters,hydraulic calculators and pump charts
A discharge with a flowmeter display must be mounted with in
6 inches
Spring probe has only 1 moving part so it tends to
Require very little maintenance
Flowmeters must be accurate to plus or minus
3%
This stainless steel probe detects movement in the discharge piping
Spring probe
This flowmeter measures speed at which it spins
Paddlewheel
What NFPA standard says for every discharge outlet with a flowmeter a pressure gauge must also be provided
1901
Only a portion of this flowmeter extends into the waterway
Paddlewheel
The greater the flow will cause this probe spring to bend
Spring probe
Paddlewheel placement
Reduces the impediment of water flow and damage by debris
What is the mechanical device installed in a discharge line that senses the amount of water flowing and provides a readout in GPM?
Flowmeter
What is the pressure of the water that leaves the pump and enters the hoseline?
Pump Discharge Pressure
Based on NFPA 1901, flowmeters must display flow in increments of at least how many gallons per minute?
10 GPM or less.
This type of flowmeter is mounted at the top of a straight section of the discharge pipe so that only a small portion of the device extends into the waterway.
Paddlewheel
This type of flowmeter employs a stainless steel spring to detect water movement in the discharge piping.
Spring Probe
A properly calibrated discharge should read within how many percent of the flow?
3%
Intake pressure cannot fall below how many PSI when relay pumping?
20 PSI
What jurisdiction specific resource is on pumpers that aid the DPO in determining the proper PDP for difference lines and nozzles?
Pump Charts
Condensed Q cannot be used for this size line.
1 3/4”
DPOs must be aware that the condensed Q formula results in a difference in friction loss than using the traditional formula. What is the difference?
20% Greater FL
Each discharge equipped with a flowmeter must have a digital readout display mounted within how many inches of the control valve?
6”
Which of the following is not an application in which a flowmeter would help a DPO?
Drafting from a dry hydrant
When is the final pressure discharge decided?
After the nozzle has been opened
This device prevents a DPO from relying on the calculations based on friction loss, elevation pressure, and length of hoseline for their PDP.
Flowmeter
If a pressure gauge is mounted at the 6” location, then a flowmeter must be mounted within how many inches?
2”
When using a flow meter in relay pumping, a DPO should continue to increase the engine speed until the flowmeter does what?
Stops increasing
What resource is a slide or dial that can be moved to cover or reveal rates of flow, size of hose, and length of hose in order to come to a conclusion to a problem?
Hydraulic Calculator
In order to create a pump chart, DPOs should compile what?
Nozzles and devices used by the department
Using the GPM flowing method, what is the FL for 100’ of 1 3/4” in Fairfax County?
30
A flowmeter displays in what unit of measurement?
GPM
What is the GPM flowing method applicable to?
Solid and fog streams
What is the condensed Q formula for a 3” hose?
FL=Q^2
What is the TPL in 500’ of 4 inch hose flowing 1,000 gpm?
100psi
Manual version of the calculator consists of a slide or dial that can be moved to cover or reveal all of the following except:
Like Volumes
Electronic hydraulic calculators may be handheld devices or permanently affixed near:
Pump panel
What is often developed by a FD and contains information specifics to that jurisdiction’s equipment and common hose layout operations?
Pump charts
Why members of a fire department should set up a form that clearly identifies the nozzles and devices used as well as any special layouts or applications?
To develop a customized pump chart
When making calculations for pump charts, round pump discharge pressure to the nearest:
5psi
Which of the following is a guideline when making initial calculations?
Ensure that the length of the wyed hoseline layout is the distance between the pumper and the wye
What is the cause of a decreased volume of water at the nozzle without a corresponding change at the flowmeter?
Hoseline burst
What device must display flow in increments of 10gpm or less?
Flowmeters
What type of flowmeter employs a stainless steel spring probe to detect water movement in the discharge piping?
Spring probe
Each discharge equipped with a flowmeter must have a digital readout display mounted within how many inches of the control valve for that discharge?
6 inches
What type of information is provided by flowmeters?
Water flow in gpm
What does the flowmeter provide to the driver/operator based on friction loss, elevation pressure and length of the hoseline?
Relieves them from relying on calculations
When are flowmeters advantageous to driver/operators?
Automatic nozzles are employed with handlines or master stream devices.
With proper calibration, a flowmeter in good working order should be accurate to a tolerance of what percentage?
Plus or minus 3%
Which size of hose can the Condensed Q formula be applied to?
3”, 4” and 5”
When using a flowmeter during relay pumping, the driver should ensure that the intake pressure does not drop below what pressure?
20 psi
Apparatus equipped with electronic pressure governors involved in relay pumping, with the exception of the attack pumper, what should the driver operate in?
RPM mode
What NFPA standard deals with Fire Apparatus Driver/ Operator Professional Qualifications?
NFPA 1002
Flowmeters must display flows in increments of what?
10 gpm or less
What type of flowmeter tends to require very little maintenance?
Spring probe
A flowmeter in good working order should be accurate to a tolerance of what?
Plus or minus 3 percent
Intake pressure cannot be allowed to drop below what PSI?
20 psi
Apparatus involved in relay pumping should operate in what mode?
RPM
Each discharge equipped with a flowmeter must have a digital readout display mounted within how many inches of the control valve for that discharge?
6 inches
If a pressure gauge is mounted at the 6 inch location then the flowmeter must be mounted within how many inches of the pressure gauge?
2 inches
During standpipe operations, electronic pressure governors will automatically compensate for what, when operating in PSI mode?
Shutting down of hand lines
When making pump charts, what shall you round pump discharge pressures to?
Nearest 5 psi
The condensed Q formula can be used to determine friction loss for the following hose sizes, EXCEPT:
2 inch
What is the condensed Q formula for 3 inch hose?
FL = Q2
The condensed Q formula for 3 inch hose can be used with 3 inch hose with what size couplings?
2.5 or 3 inch
When using the condensed Q formula over, FL = CQ2L, the friction loss will be greater by approximately what percentage?
20 percent
When using the condensed Q formula as opposed to FL = CQ2L. In a hose lay of 1,000 feet of 3 inch. The difference in friction loss can be up to what psi?
50 psi
What is the condensed Q formula for 4 inch hose?
FL = Q2/5
What is the condensed Q formula for 5 inch hose?
FL = Q2/15
The GPM flowing method cannot be used on 2.5 inch hose flowing less than how many gpm’s?
160 gpm
According to NFPA 1901, for every discharge outlet equipped with a flow meter, what shall also be provided?
Pressure guage
In a relay operation, what engine shall be the only engine operating in psi mode?
Attack
How does a flowmeter display water output?
GPMs
When are flowmeters the most adventagous?
When using automatic nozzles
Flow meteres must display flow in increments of:
10
Where are paddlewheel flowmeters mounted on a straight section of discharge?
Top
With proper calibration, a springprobe flowmeter be accuarate within?
3%
Discharges equipped with a flowmeter must have a mounted discharge display within:
6 inches
If a pressure gauge is mounted in conjunction with a flowmeter, the digital flowmeter read out must be mounted within:
2 inches
What is the minum pressure required for an intake?
20 PSI
What operation mode should pumpers equipped with an electronic pressure governor operate in when involved in a relay pumping operation?
RPM mode
What is the equation for determinig friction loss in 3-inch hose using the condesed Q formula?
FL=Q2
What type of information is provided by flowmeters?
water flow in GPM
Which of the following flowmeters uses a stainless steel probe to detect water movment within discharge piping?
spring probe
What is the likely cause for a decrese of water volume at the nozzle yet no reduction in the flowmeter reading?
hose line burst
Using a flowmeter during a relay operation allows pump operators to supply engines without knowing:
the volume of water flowing from the receiving engine
What operational mode should a pumper be placed in when supplying a standpipe?
pressure mode
What is the condesed Q formula for determing friction loss in 4 “ hose?
FL=Q2/5
What is the condesed Q formula for determing friction loss in 5 “ hose?
FL=Q2/15
What stream is the GPM flowing method applicable?
Fog and solid streams
What makes using a flowmeter advantageous for the pump operator?
Reduces the number of pressure calculations required
All of the folowing are methods to determine pump discharge pressure except:
PSI indicators
The actual pressure of the water as it leaves the pump and enters the hoseline, and is the total amount of pressure being discharged by a pump is known as:
Pump discharge pressure
A mechanical device installed in a discharge line that senses the amount of water flowing and provides a readout in units of GPM is known as:
Flowmeter
What should be done to ensure flowmeter reliability?
Must be maintained in accordance with the manufacturers recommendations
Flowmeters measure and display water in what form?
Gallons per minute (GPM)
Because handlines or master streams maintain a predetermined nozzle pressure and a stream thaat appears to be adequate, automatic nozzles may lead you to do what?
Supply an insufficient discharge pressure, creating a low flow.
Based on the NFPA 1901 standard, for every discharge outlet equipped with a flowmeter, a pressure gauge shall also be provided, and and must display flow in incriments of how many GPMs or less?
10 GPMs
What kind of a flowmeter is mounted at the top of the straight section of the discharge pipe and has a sensor measure the speed of the water as it passes?
Paddlewheel flowmeter
What kind of a flowmeter employs a stainless steel spring probe to detect water movement within the discharge piping?
Spring probe flowmeter
A flowmeter in good working order should be accuract to a tolerance of ± what percent?
3%
Each discharge equipped with a flowmeter must have a digital readout display mounted within what distance of the control valve?
6 inches
When relay pumping, the intake pressure cannot be allowed to drop below what pressure?
20 PSI
All engines involved in a relay should be operating is what mode?
RPM mode
Driver/operators must remember to do what after the fire attack team starts flowing water?
Finalize the PDP based on the exact conditions
A chart carried on a fire apparatus to aid the pump operator in determining proper PDP is known as what?
Pump chart
When creating a pump chart, PDP’s should be rounded to the nearest what?
5 PSI
The condensed Q formula may be used for operations in which the friction loss can be determined for what size hose lines?
3-, 4-, or 5- inch
The GPM flowing method is applicable to __ and is calculated using flow in ___.
both solid and fog streams; GPM’s
An easy way to determine friction loss in 2½” hose is to do what?
Subtract 10 from the first two number of the GPMs
When operating an apparatus equipped with a flowmeter, the number and types of nozzles on lines operating from standpipes may be factored in what way?
Add the flow rate for each nozzle toether and pump the volume of water for that rate
The flowmeter relieves the driver/operator from relying on calculations based on all the following except what?
Nozzle pressure
Per NFPA 1901, flowmeters must display flow in increments of how many GPM or less?
10
Which type of flowmeter is mounted on top of a straight section of the discharge pipe so only a small portion of the device extends into the waterway?
Paddlewheel
Which type of flowmeter employs a stainless steel spring probe to detect water movement in the discharge piping?
Spring probe
Which flowmeter requires little maintenance due to the fact that there is only one simple moving part?
Spring probe
Each discharge equipped with a flowmeter must have a digital readout display mounted how far from that control valve for that discharge?
6 inches
At what percent can a flowmeter be accurate to with proper calibration? (plus or minus)
3%
The intake pressure in a relay pumping operation must not drop below what?
20 PSI
What has most likely occured if an attack team members says the volume of water at the nozzle has suddenly decreased but there is no change at the flowmeter?
Hoseline may have burst
What is typically printed on laminated sheets and carried on the apparatus to specify pump discharge pressures?
Pump Chart
How much should pump discharge pressure calculations be rounded up?
To the nearest 5 PSI
The condensed Q formula may be used for operations in which the friction loss can be determined for which hose?
3, 4, or 5 inch hose
What is the margin of difference when using the Condensed Q formula instad of FL=CQ^2L?
20% less
Which tool for determining pump discharge pressure may consist of a slide or dial that can be moved to cover or reveal rates of flow, size of hose, and length of hose layout in order to come to a conclusion of a problem?
Hydraulic calculators
How far from a pressure guage must a flowmeter be mounted?
2 inches
Apparatus equiped with electronic pressure governors set in PSI mode should compensate for what during standpipe operations?
Shutdown of lines when multiple lines are connected to the standpipe
