Ch 8 Pg 281 Flowmeter - Pg 284 Hyd Calc. Flashcards Preview

Pump Operator > Ch 8 Pg 281 Flowmeter - Pg 284 Hyd Calc. > Flashcards

Flashcards in Ch 8 Pg 281 Flowmeter - Pg 284 Hyd Calc. Deck (25)
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1
Q

The driver must use “blank” to determine the appropriate amount of water to be discharged form hose lines and nozzles?

A

Hydraulic Calculations

2
Q

Flow meter

A

Mechanical device installed in discharge line that sense flow of water, which reads in GPM

3
Q

What reduces the number of pressure calculations required of driver?

A

Flowmeters

4
Q

How do flowmeters measure and display water flow?

A

In general

5
Q

When using automatic nozzles with hand lines and/or master stream devices it is advantageous for driver to “blank” and “blank” determine the flow.

A

Quickly and accurately

6
Q

The flowmeters relieve you from relying on calculations based on what three areas?

A

Friction loss, evaluation pressure, and length of hoseline.

7
Q

Based on NFPA 1901, every discharge equipped with a flowmeter shall also have what?

A

A pressure gauge

8
Q

Based on NFPA 1901, flowmeters must display flow in increments of ?

A

10 GPM or less.

9
Q

What are the two types of flowmeters?

A

Paddlewheel

Spring probe

10
Q

What is a paddlewheel flowmeter?

A

A small device that extends into the waterway.

11
Q

Paddlewheel flowmeters reduce what?

A

Reduces the impediment to water flow and lessens the chance of damage by debris

12
Q

What is a spring probe flowmeter?

A

Stainless steel probe detected by pressure on a spring. The greater the flow the more the spring bends. One simple moving part, requires little maintenance.

13
Q

A flowmeter is good working order should be accurate within how many percent?

A

Plus or minus 3 %, in other words, based on 100gpm, display should Ben impress or less than 3 gallons.

14
Q

each discharged equipped with a flowmeter must have a digital readout display mounted with in how many inches of the control valve for that discharge

A

6inches

15
Q

If there is a pressure gauge mounted at the 6 inch location, then the flowmeter must be mounted with in how many inches adjacent to the pressure gauge?

A

2 inches

16
Q

What additional information do monitoring devices offer?

A
  • Flow from any specific discharge
  • Total “real time” water flow through the pump
  • total water flowed through the pump for the duration of the incident
  • amount of foam being flowed
17
Q

The driver may use flowmeters to identify what?

A

Water flow issues such as kinks, partially closed valves, and burst lines. All show decreases in pressure

18
Q

Intake pressure should not be allowed to drop below what PSI

A

20 psi

19
Q

With the exception of attack pumpers, What should pumps with electronic pressure governors involved in relay pumping operate in?

A

RPM

20
Q

Standpipes: when equipped with flowmeters, the number and types of nozzles on lines operating on a standpipes you can be factored by?

A

Adding the flow rate for each nozzle together and pumping the volume that matches that rate.

21
Q

When operations on a standpipe, the driver must monitor the status of each line to determine what?

A

Which attach lines are flowing

22
Q

During standpipe operations, when a line is shut down, what must you do?

A

Lower the pressure accordingly, or the standpipe system will try to flow excess through the remaining hose lines.

23
Q

True or false, the pressure governor in RPM mode with compensate for a shut down line, when multiple lines are in use during standpipe ops?

A

False, RPM mode will not automatically compensate for reduced flow, but PSI mode will.

24
Q

Drivers must consider what when a hose line or standpipe is charged?

A

That there is no flow through the system until until you open the nozzle

25
Q

Drivers must rely on what three things to set pressures that are relatively close to what is required for water discharge?

A

Experience, training, and operating guidelines