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WEEK 4 FIRE PUMPS EXAM QUESTIONS & ANSWERS
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WEEK 4 FIRE PUMPS EXAM QUESTIONS & ANSWERS
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WEEK 4 FIRE PUMPS EXAM QUESTIONS & ANSWERSDuring operation, the suction gauge reads 57 and the discharge gauge reads
139. The net is: - -82 psi
- "Churn" pressure is another term used for: - -Shutoff pressure
- When suction pressure can be below 20 psi during pump operation, the
suction gauge must read: - -Negative pressure in inches of mercury
- A wide impeller would result in: - -Higher volumes with higher pressures
- A 3000 gpm vertical turbine fire pump must have an air release valve of
what size? - -1-1/2"
- State the minimum size of discharging piping for a circulation relief valve
on a 2000 gpm pump. - -3/4"
- Identify the component of the pump that helps to reduce velocity and
increase pressure. - -Volute casing
- Why are check valves preferred over ground face unions for sensing line
installations? - -They act as a fail safe for pump operation
- Diesel fuel tanks must be maintained at: - -1/3 empty or 2/3 full
- In a closed loop metering arrangement, what additional component is
required? - -Air release
- In a fire pump arrangement, the pressure relief valve is installed where? -
-Between the pump and discharge check valve
- What is the required minimum velocity for flushing the suction piping to a
fire pump? - -15 ft/sec
- What does a pressure maintenance pump do? - -It is capable of
maintaining pressure
- Determine the fire pump start pressure if churn pressure is 85 and supply
pressure is 50. - -120 psi
- When aligning a fire pump and driver, if the gap between couplings is not
equal it is due to: - -Angular misalignment
, - What may be required to assist in the lubrication of packing? - -Lantern
rings
- What is installed to protect the pump shaft from damage? - -Sleeves
- What will a pump room with a diesel driver require that one with an electric
driver will not? - -Louvers (Ventilation)
- How far from the suction flange of the fire pump must a backflow
preventer be installed? - -10 pipe diameters
- When an eccentric reducer is required, how is it installed? - -Suction side-
flat on top, taper on bottom.
- How do you figure out net pressure? - -Discharge - suction = net pressure
- How do you figure out fire pump start pressure? - -Churn pressure +
supply pressure - 15 = fire pump start pressure
- Define churn/shutoff pressure. - -The pressure developed by the pump
with no flow- 0%
- Define rated pressure. - -The pressure developed by the pump when
flowing 100% of pump demand.
- Define peak pressure. - -The pressure developed by the pump when
flowing 150% of pump demand.
- Define net pressure. - -Pressure actually produced by a pump.
- What is the purpose of a fire pump? - -To boost pressure and meet flow
demand from an available water source.
- What is the minimum, typical and maximum churn/shutoff pressures? - -
101%- minimum of rated pressure
120%- typical of rated pressure
140%- maximum of rated pressure
- When is a pressure relief valve required on a diesel pump? - -When 121%
of the rated churn pressure + static supply pressure exceeds 175%
- What are the two types of pumps? - -Centrifugal and Positive
Displacement
- What is single suction? - -When water enters on only one side of impeller
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