29 Questions
When does cavitation occur in a fire pump system?
When attempting to flow water faster than it is being supplied to the pump
What is the minimum gauge pressure required for the pump and roll apparatus to pump at least 20 gpm while moving at a speed of 2 mph or less?
80 psi
According to NFPA 1901, if a pumping system is rated at 3,000 gpm or less, it should be able to deliver water at what rate at 200 psi?
70% of the rate capacity
When drafting, a fire pump rated at less than 1500 gpm is capable of taking suction through how many feet of suction hose?
20 ft
What type of pumps does the fire service primarily use?
Positive displacement and centrifugal pumps
What is the function of a positive displacement pump in relation to a centrifugal pump?
It is used as a priming pump for a centrifugal pump
What is the minimum requirement for baffling in water tanks as per NFPA 1901?
Two transverse or longitudinal vertical baffles covering at least 75% of the area
What size should the removable pipe plugs be in cleanout sumps according to NFPA 1901?
3 inches or larger
What type of flow does a positive displacement pump produce?
Flow by capturing a specific volume of fluid per pump revolution
Why are positive displacement pumps considered ideal for use as priming pumps for centrifugal pumps?
They can move air or water with every revolution
In what scenarios can positive displacement pumps be used apart from priming pumps for centrifugal pumps?
High-pressure auxiliary pumps or portable pumps
What are the two types of positive displacement pumps?
Piston pumps and rotary pumps
What is the most common type of fire pump used today?
Centrifugal fire pump
In parallel/volume mode, what percentage of the pump's total capacity does each impeller pump?
50%
What is the most common mode used on two-stage pumps?
Series/pressure mode
To satisfy UL standards, what percentage of rated capacity must pumps produce at 200 psi for 10 minutes?
70%
What is the minimum rate at which water must be delivered to the pump if the water tank has a capacity greater than 500 gallons?
500 gpm
At what pressure should each discharge outlet valve be operable?
250 psi
What size outlets are provided on a pump rated at less than 750 gpm?
One 2.5" outlet
When should the pressure relief system be installed on the pump system?
When the intakes are not valved
What is the minimum requirement for the master pump intake gauge to measure?
30 inches Hg vacuum to at least a gauge pressure of 300 psi
Where must the master pump discharge gauge be located in relation to the intake gauge?
Within 8" of the master pump intake gauge
What accuracy range do flowmeters generally boast?
1 - 3 percent
What does the discharge pressure relief valve do?
Controls pressure by passing water from the discharge side of the pump back into the intake side of the pump
What is the function of a pressure governor in a fire pump system?
Controls the engine speed which translates to pump pressure
Where is the simplest form of power supply found?
Portable pump
What is the maximum pressure rise the pump system must control automatically?
30 psi
What type of lubricant must the priming system be capable of operating with?
Biodegradable nontoxic lubricant
How does the discharge pressure relief valve control pressure?
By passing water from the discharge side of the pump back into the intake side of the pump
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