Pumps Chapter 2 pp 1-11 Flashcards
From the Pump Manual:
Pump can be described as
any of various mechanical devices which utilizes an external source of power
From the Pump Manual:
How many types of pumps are there?
(2) Two
From the Pump Manual:
What are the two types of pumps?
Positive displacement and Non-positive displacement pump
From the Pump Manual:
A rotary vane priming pump is an example of
Example of Positive displacement
From the Pump Manual:
Example of non-positive displacement
Centrifugal pump.
From the Pump Manual:
If wateris place in a container on a turntable what happenms to the water?
The water at the center would begin to move outward and the water at the edges would move upward
From the Pump Manual:
How istangential velocity created in the centrifugal pump.
The outer rim of the impeller ismoving faster that the inner and due to the spiral path of the water the water travels at a greater distance with each rotation
From the Pump Manual:
A centrifugal pump uses what as a means of imparting velocity
An impeller
From the Pump Manual:
What do the vanes of the impeller prevent from happening to the water?
They prevent eddying of the water
From the Pump Manual:
Which direction are the vanes of the impeller curved?
Curved away from the direction of rotation
From the Pump Manual:
The vanes of the impeller allow for the partial conversion of what to what?
Partial conversion of velocity to pressure
From the Pump Manual:
What position is the impeller in the pump case?
Eccentric to the pump casing
From the Pump Manual:
A volute is?
The area between the outer edge of the impeller and the pump casing is always increasing
From the Pump Manual:
How is the water discharge by the volute prevented from returning to the intake area of the impeller?
Close fit between the clearance ring and the pump casing or another clearance ring of the impeller
From the Pump Manual:
Why is it important never to run the pump for long periods of time with no water running in it?
The pump can overheat causing expansion of the internal parts of the pump taking up the clearance between the rings and causing the pump to seize.
From the Pump Manual:
Most pump impellers rotates at awhat ratio to the speed of the driving force?
2 to 1
From the Pump Manual:
Why is the ratiovelocity of the water entering and leaving leaving the impeller always contain
Since the size and area of the impeller are fixed
From the Pump Manual:
Pressure increase is cause by whattwo factor
a. Ratio of entrance and exit velocities, b. The velocity of the water entering the impeller
From the Pump Manual:
In this department single stage pumps are rated a?
250 or 1500 gpm at 150 psi.
From the Pump Manual:
In operating single stage pumpswhat are the two controls?
a. The engine throttle control b. Discharge valve to control the volume discharge at any desire pressure
From the Pump Manual:
What is used to balance the hydraulic thrust?
clearance rings
From the Pump Manual:
Single stage single suction type centrifugal pumps are limited to how much output
750 GPM
From the Pump Manual:
What is the departments maxium discharge pressure
300PSI
From the Pump Manual:
For a two stage pump to pump in pressure the pumps must operating in what oreintaion?
Series
From the Pump Manual:
For a two stage pump to pump in volume the pumps must pump in what oreintaion?
Parallel
From the Pump Manual:
Why are single stage pumps more commonly used today?
Simplifed Operation
