Pump Flashcards
Pumps generally fall into two categories: positive displacement pumps and non-
positive displacement pumps.
What is a characteristic of positive displacement pumps?
Positive displacement pumps discharge a definite volume of liquid or gas in each cycle of pump operation.
To function properly in the foam position, the eductor requires a flow of at least_____ gpm.
95 gallons per minute
What statement about drafting operations is CORRECT for being submerged?
For high-quantity flows, the end of the hard sleeve assembly shall be submerged at least 18 inches if possible
Always using the same formula for engine pressure, in the same order, will help
the pump operator develop repetition and proficiency. Any time the pump operator calculates engine pressure, it is in his/her best interest to start with which factor?
Nozzle pressure
When charging a tunnel/station standpipe system, the pump operator should use a
dual-line reverse layout from the tunnel/station connection to a hydrant. After connecting the wagon to the hydrant and opening it, what should he/she do NEXT?
Open the intake and note the static pressure from the hydrant
A pump operator can estimate a hydrant’s capacity through calculating the percentage drop in intake pressure during fireground operations. The formula for calculating the pressure drop as a percentage is _____.
(static pressure – residual pressure) ÷ static pressure
What about relay pump operations is CORRECT?
It may be necessary to use more than two companies in relay operations, thus avoiding long distances between pumps
The range of a firefighting stream is dependent upon four factors: nozzle pressure, nozzle diameter, angle of inclination above the horizontal plane and windspeed/direction. Of the three factors that are under the control of firefighters,which is MOST important?
Nozzle pressure
According to the Pump Manual, what is the Department’s maximum discharge pressure for single-stage pumps?
300 psi
When calculating engine pressure, elevation shall be added/subtracted to the total depending on the position of the nozzle.
How many pounds shall be added/subtracted for each story above/below the level of the pump?
5 psi
According to the Pump Manual, what is the FIRST step of placing the pump in gear?
Shift the transmission to neutral
What is a DAILY pump maintenance task?
Exercising the transfer valve (if a two-stage pump) and verifying that the volume stage results in a reduction in discharge.
When placing the pump in gear, the operator can ensure that the pump went into gear by observing that the gear selector went into______ gear, that there are two green lights illuminated at the PTO and that the speedometer increased to approximately _____ MPH
Fourth gear
15 MPH
The governor constantly monitors the discharge pressure and compares it to the engine RPM. What will occur its the discharge pressure drops very quickly (from air coming into the pump)?
If the discharge pressure does not increase after 3 to 7 seconds,
the governor will reduce the engine speed by 150 RPM,
and this RPM will be held as long as the pressure stays above 45 PSI.
