Podcast
Questions and Answers
What does the 'Red Line' signify in relation to GPM?
What does the 'Red Line' signify in relation to GPM?
What is the primary function of a Pressure Governor?
What is the primary function of a Pressure Governor?
What is meant by 'Residual Pressure' in fire fighting terms?
What is meant by 'Residual Pressure' in fire fighting terms?
In tandem pumping, what does the second pumper do?
In tandem pumping, what does the second pumper do?
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What is 'incrustation' commonly caused by?
What is 'incrustation' commonly caused by?
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What occurs when the 'Red Line' is reached?
What occurs when the 'Red Line' is reached?
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How does a pressure governor maintain pump discharge pressure?
How does a pressure governor maintain pump discharge pressure?
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What is the main function of bleeders located on gated intakes?
What is the main function of bleeders located on gated intakes?
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What element primarily causes incrustation in hoses and pipes?
What element primarily causes incrustation in hoses and pipes?
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What defines friction loss in the context of water flow?
What defines friction loss in the context of water flow?
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Flashcards
Red Line
Red Line
The pressure point where GPM produces approx. 36 psi/100 feet friction loss.
Residual Pressure
Residual Pressure
The part of total pressure not used for overcoming friction or gravity.
Tandem Pumping
Tandem Pumping
Connecting two pumpers in series to a fire hydrant for increased supply.
Pressure Governor
Pressure Governor
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Friction Loss
Friction Loss
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Vacuum Primers
Vacuum Primers
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Incrustation
Incrustation
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Bleeders
Bleeders
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Differential Turbine
Differential Turbine
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Paddlewheel
Paddlewheel
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Study Notes
Red Line
- The Red Line is reached when friction loss is approximately 36 psi/100 feet of hose, indicating the need for either a larger line or additional pump to deliver the desired gallons per minute (GPM).
- Reaching the Red Line triggers decisions about adding another line or increasing the line size, based on the desired GPM and friction loss of approximately 36 psi/100 feet of hose.
Residual Pressure
- Residual pressure is the portion of total pressure not used to overcome friction or gravity while delivering water through hoses, pipes, fittings, and adapters.
- Maintaining sufficient residual pressure is crucial for safe operation; it prevents injury and damage to equipment.
Tandem Pumping
- Tandem pumping involves connecting two pumpers in series to a fire hydrant.
- One pumper directly connects to the hydrant, and the second pumper uses the excess flow from the first pumper's intake as its water source.
Vacuum Primers
- Vacuum primers utilize the existing vacuum in a gasoline engine's intake manifold.
Incrustation
- Incrustation can be caused by tubercular corrosion, rust, water's chemical constituents, or the growth of biological organisms.
Pressure Governor
- Pressure governors regulate engine power output (RPM) to maintain a set pump discharge pressure.
- If excess pressure builds up, a tube connected to the pump discharge transmits the pressure increase to a governing device, reducing the throttle.
Bleeders
- Bleeders, located on gated intakes (5" intake relief valve), release air as a supply line is being filled before opening the gated intake.
Flowmeters
- Four basic types of flowmeters: Differential, Turbine, Paddlewheel, and Spring Probe.
Friction Loss
- Friction loss is the reduction in pressure caused by water turbulence against the hose or pipe walls.
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Description
This quiz covers essential concepts related to firefighting, including the Red Line, residual pressure, tandem pumping techniques, and the role of vacuum primers. It is crucial for understanding how to manage water flow and pressure in firefighting operations effectively. Test your knowledge on these vital topics.
