Chapter 8 Flashcards
Why are flowmeters useful in relay pumping operations?
The driver/operator may feed a supply line without having to know the volume of water flowing from receiving pumper.
The condensed Q formula may be used for operations in which the friction loss can be determined for
3, 4, or 5-inch hose.
A flowmeter should be accurate to a tolerance of plus or minus
3 percent.
The driver/operator must consider that when a standpipe or hoseline is charged, there:
is no flow through the system or hose layout until the nozzle is opened.
Which statement about the gpm flowing method is MOST accurate?
It is applicable to both solid and fog streams.
Which type of flowmeter has only one simple moving part and tends to require little maintenance?
Spring probe
Flowmeters are especially advantageous when automatic nozzles are employed with handlines or master stream devices because automatic nozzles may lead driver/operators to:
supply insufficient discharge pressures, creating a low gallon (liter) per minute flow.
Which type of flowmeter uses a sensor to measure the speed at which it spins and translates the information into a flow measurement?
Paddlewheel
Each discharge equipped with a flowmeter must have a digital readout display mounted within:
6 inches
When a line from a standpipe operation is shut down, the pressure:
must be lowered accordingly, or the standpipe system will attempt to flow excess water through remaining hoselines.
Electronic hydraulic calculators may be handheld or may be:
permanently affixed to a location near the pump operator’s pane.
Which of the following statements about the flowmeter is MOST accurate?
It relieves you from relying on calculations based on friction loss, elevation pressure, and length of hoseline.
Which type of flowmeter is mounted at the top of a straight section of discharge pipe so that 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 discharge piping?
Spring probe
When developing a customized pump chart, column headings should include information such as flow, nozzle pressure, and:
distance in feet for hose layouts.
A guideline when developing a customized pump chart is to:
round pump discharge pressure calculations to the nearest 5 psi (35 kPa).
Using the condensed Q formula, what is the total pressure loss in 500 feet of 4-inch hose flowing 1,000 gallons per minute?
100 psi 1,000 / 100 = 10 10 x 10 = 100 100/5 = 20 20 per 100ft 20 x 5 = 100 psi
Using the condensed Q formula for 5-inch hose, what is Q&squared; divided by?
15
Which of the following statements about pump charts is MOST accurate?
They contain information specific to a jurisdiction’s equipment and common hose layout operations.
The gpm flowing method may be used:
for various diameter hose
The condensed Q formula FL = Qsquared; is used with:
3-inch hose.
Which of the following is MOST likely to be the cause if a driver/operator receives a message from an attack team that the volume of water at the nozzle has suddenly decreased without a corresponding change at the flowmeter?
A hoseline may have burst
Flowmeters reflect water pressure that will be discharged through the nozzle:
if the hoseline is functioning at its rated capacity
Which of the following statements about electronic hydraulic calculators is MOST accurate?
Once variables have been entered, the calculator applies preprogrammed formulas to arrive at pump discharge pressure.
Which of the following is a guideline for initial calculations when developing a customized pump chart?
Include friction loss for master stream appliances.
