# Pumps Chapter 2 pp 1-11 Flashcards Preview

## 03. Pump Operating Procedure > Pumps Chapter 2 pp 1-11 > Flashcards

Flashcards in Pumps Chapter 2 pp 1-11 Deck (26)
1
Q

From the Pump Manual:

Pump can be described as

A

any of various mechanical devices which utilizes an external source of power

2
Q

From the Pump Manual:

How many types of pumps are there?

A

(2) Two

3
Q

From the Pump Manual:

What are the two types of pumps?

A

Positive displacement and Non-positive displacement pump

4
Q

From the Pump Manual:

A rotary vane priming pump is an example of

A

Example of Positive displacement

5
Q

From the Pump Manual:

Example of non-positive displacement

A

Centrifugal pump.

6
Q

From the Pump Manual:

If wateris place in a container on a turntable what happenms to the water?

A

The water at the center would begin to move outward and the water at the edges would move upward

7
Q

From the Pump Manual:

How istangential velocity created in the centrifugal pump.

A

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

8
Q

From the Pump Manual:

A centrifugal pump uses what as a means of imparting velocity

A

An impeller

9
Q

From the Pump Manual:

What do the vanes of the impeller prevent from happening to the water?

A

They prevent eddying of the water

10
Q

From the Pump Manual:

Which direction are the vanes of the impeller curved?

A

Curved away from the direction of rotation

11
Q

From the Pump Manual:

The vanes of the impeller allow for the partial conversion of what to what?

A

Partial conversion of velocity to pressure

12
Q

From the Pump Manual:

What position is the impeller in the pump case?

A

Eccentric to the pump casing

13
Q

From the Pump Manual:

A volute is?

A

The area between the outer edge of the impeller and the pump casing is always increasing

14
Q

From the Pump Manual:

How is the water discharge by the volute prevented from returning to the intake area of the impeller?

A

Close fit between the clearance ring and the pump casing or another clearance ring of the impeller

15
Q

From the Pump Manual:

Why is it important never to run the pump for long periods of time with no water running in it?

A

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.

16
Q

From the Pump Manual:

Most pump impellers rotates at awhat ratio to the speed of the driving force?

A

2 to 1

17
Q

From the Pump Manual:

Why is the ratiovelocity of the water entering and leaving leaving the impeller always contain

A

Since the size and area of the impeller are fixed

18
Q

From the Pump Manual:

Pressure increase is cause by whattwo factor

A

a. Ratio of entrance and exit velocities, b. The velocity of the water entering the impeller

19
Q

From the Pump Manual:

In this department single stage pumps are rated a?

A

250 or 1500 gpm at 150 psi.

20
Q

From the Pump Manual:

In operating single stage pumpswhat are the two controls?

A

a. The engine throttle control b. Discharge valve to control the volume discharge at any desire pressure

21
Q

From the Pump Manual:

What is used to balance the hydraulic thrust?

A

clearance rings

22
Q

From the Pump Manual:

Single stage single suction type centrifugal pumps are limited to how much output

A

750 GPM

23
Q

From the Pump Manual:

What is the departments maxium discharge pressure

A

300PSI

24
Q

From the Pump Manual:

For a two stage pump to pump in pressure the pumps must operating in what oreintaion?

A

Series

25
Q

From the Pump Manual:

For a two stage pump to pump in volume the pumps must pump in what oreintaion?

A

Parallel

26
Q

From the Pump Manual:

Why are single stage pumps more commonly used today?

A

Simplifed Operation