Video 4 C1: Intro to centrifugal pumps

Question 1

centrifugal pumps consist of __% of water pump designs!

Answer 1

85

Question 2

how does centrifugal pumps use centrifugal force?

Answer 2

they use it to generate pressure and flow

… by pulling water from the eye of the propeller, spinning the water and forcing it to the outer edge

Question 3

in what ways can pumps be place to increase flow or pressure? (2 ways)

Answer 3

1. in series
2. in parallel

Question 4

what are the two main parts of centrifugal pumps?

Answer 4

• impeller
• volute

Question 5

what does the impeller part of the centrifugal pump do?

Answer 5

imparts kinetic energy to the fluid being pumped and creating pressure and flow

Question 6

what does the volute part of the centrifugal pump do?

Answer 6

gives direction and control of the fluid

Question 7

as altitude increases, Patm ____

Answer 7

decreases

Question 8

when does the impeller not work?

Answer 8

when the impeller pulls in air, such as an air pocket

Question 9

what is it called when the impeller pulls in air?

Answer 9

‘losing prime’

Question 10

what happens when the impeller pulls in air?

Answer 10

the pump cannot create the needed vacuum/pressure

think of straw. when you remove your lips or suction from the straw, the fluid falls back into the cup

Question 11

main difference between straight-end suction pump and self priming pump?

Answer 11

the location of the suction opening:
- SED pump = above the impeller eye (middle)
- SP pump =

Question 12

what is it called when the pump is lifting water from below?

Answer 12

negative suction lift

Question 13

what is it called when a pump is pumping from a positive suction or flooded suction?

Answer 13

booster pump