Pumps 1

Question 1

Definition of a pump?

Answer 1

Mechanical device that transfers liquids against gravity or exhausts gases.

Question 2

What is pump capacity?

Answer 2

The amount of material that a pump moves in a given amount of time.

Question 3

What are the three things that determine pump capacity?

Answer 3

Size of pump. How fast motor is turning pump in RPM. The viscosity of the fluid.

Question 4

How do you measure flow?

Answer 4

GPM

Question 5

Definition of pressure?

Answer 5

Force per unit area.

Question 6

Define Head.

Answer 6

Hight of a column of fluid.

Question 7

What is positive head? (Suction head)

Answer 7

Positive Pressure on inlet side of pump caused by head.

Question 8

What is negative head? (Suction lift)

Answer 8

Distance liquid must be lifted to the inlet of pump caused by less than atmospheric pressure.

Question 9

Pressure at the discharge of pump is what?

Answer 9

Discharge head.

Question 10

Total distance a pump can lift the liquid is considered?

Answer 10

Total head.

Question 11

Centrifugal pumps have to be what I’m order to work?

Answer 11

Primed the can not pump air.

Question 12

Limitation to single impellers?

Answer 12

Pressure. Once they are at 80-90 psi they will stall At discharge.

Question 13

Multi stage impellers help with what?

Answer 13

Can build more pressure at the discharge of pump.

Question 14

Three types of impellers?

Answer 14

Open, semi-open, enclosed.

Question 15

Two designs of pump cases?

Answer 15

Split case, insuction design.

Question 16

Two bearing configurations for pumps?

Answer 16

Between bearing = split case design.
Over hung = endsuction design.

Question 17

Two types of packing for pump?

Answer 17

Compression packing.
Mechanical seal.

Question 18

Four things needed to pack pumps with compression packing?

Answer 18

Stuffing box
Packing rings
Lantern ring
Glad follower

Question 19

What do you have to do when inserting the packing rings?

Answer 19

Stagger the joints.

Question 20

Two ways to attach driver to pump? (Mounting styles)

Answer 20

Frame mount / c frame mount
Close coupled ( share the same shaft )

Question 21

What are three things flush water does?

Answer 21

Flush away contaminants
Cools shaft
Cooks packing

Question 22

Two sources of flush water?

Answer 22

External source
The process water itself

Question 23

What is pump cavitation?

Answer 23

Collapse and formation of air bubbles.