Pumps and Pumping

Question 1

Normal atmospheric pressure at sea level is:

Answer 1

14.7 PSI

Question 2

Maximum theoretic height to lift water via suction is:

Answer 2

33.9’

Question 3

Maximum height by suction in practice is:

Answer 3

26-28’

Question 4

Operating lift for fire pumps not exceed:

Answer 4

15-20

Question 5

Piston pumps are:

Answer 5

positive displacement pumps

Question 6

Rotary pumps used to prime centrifugal pumps:

Answer 6

Can expel air & water

Question 7

Types of centrifugal pumps are (3):

Answer 7

single stage, multi stage, parallel series

Question 8

Centrifugal pump is a ___________ type pump

Answer 8

“flow through”

Question 9

Centrifugal pump impeller is a ___________ closed at sides

Answer 9

blade type wheel

Liquid enters at center hub and discharged at outer rim

Question 10

Volute housing in a fire pump is good for:

Answer 10

various discharge & pressure needs

Question 11

All priming pumps must be capable of developing ____ of mercury vacuum

Answer 11

22”

Question 12

Priming pump 1250 GPM must prime on a 10’ lift within:

Answer 12

30 seconds

Question 13

Priming pump 1500 GPM must prime on a 10’ lift within:

Answer 13

45 seconds

Question 14

All relief valves MUST LIMIT rise to ______ above set pressure

Answer 14

20psi

Question 15

Relief valves when maintained will limit rise to _____ above set pressure

Answer 15

10 psi

Question 16

Bourban gauges used on fire pumps are ________ than ________ type

Answer 16

less sensitive , mercury type

Question 17

3 kinds of Bourban gauges:

Answer 17

pressure, vacuum, compound

Question 18

Water temperature of _______ will give problems when drafting. Find cooler water or be content with reduced flow

Answer 18

95-100F

Question 19

Cavitation sounds like:

Answer 19

small stones or marbles in the pump

Question 20

To reduce cavitation when pumping:

Answer 20

reduce discharge rate, reduce lift, use a larger suction line

Question 21

Class A pump rating:

Can discharge 150 pounds, ___% at 200 pounds, ____% at 250 pounds

Answer 21

70, 50

Question 22

Good fire stream passes ____% of stream through____” diameter circle

Answer 22

90, 15

Question 23

Water weighs approximately ______ pounds/gallon

Answer 23

8.5

Question 24

When pumping from draft try not to lift more than_____:

Answer 24

10-12’

Question 25

The strainer should be submerged _______ off bottom:

Answer 25

18” and 12”

Question 26

Suction gauge should not register less than _____ psi of incoming pressure

Answer 26

5