Centrifugal Pumps

Question 1

Applications of Centrifugal Pumps

Answer 1

Oil and Energy
Industrial and Fire Protection Industry
Waste Management, Agricultural and Manufacturing
Pharmaceutica;, Chemical and Food Industries
Various Industries

Question 2

Classifications of Pumps

Answer 2

Centrifugal Pump
Positive Displacement Pump

Question 3

How does a Centrifugal Pump work?

Answer 3

By centrifugal force. Centrifugal force is the outward force acting on a rotating body.

Question 4

It is the most common type of pump in DOE facilities

Answer 4

Centrifugal Pump

Question 5

T or F . Centrifugal Pumps enjoy widespread applications partly due to their ability to operate over a wide range of flow rates and pump heads.

Answer 5

T

Question 6

Main parts of a Centrifugal Pump

Answer 6

Wet end
Mechanical end

Question 7

It is the part of the pump that dictates the hydraulic performance of pump.

Answer 7

Wet end

Question 8

Components of the wet end part of centrifugal pump

Answer 8

Impeller
Casing

Question 9

This includes the parts that support the impeller within the casing, seal the casing where the shaft passes through it and enable rotation.

Answer 9

Mechanical end

Question 10

Components of the mechanical end of a centrifugal pump

Answer 10

Pump shaft
Shaft sleeves
Bearings
Sealing arrangement

Question 11

A stationary pump casing has a?

Answer 11

Small drain for flushing
Vent fittings for removing air

Question 12

It is the region that expands in cross sectional area as it wraps around the pump casing.

Answer 12

Volute

Question 13

It converts velocity head to static pressure

Answer 13

Volute

Question 14

It is a set of stationary vanes that surround the impeller

Answer 14

Diffuser

Question 15

It increases the pump efficiency by allowing a more gradual expansion and less turbulent area for the liquid to reduce velocity.

Answer 15

Diffuser

Question 16

Classifications of an Impeler.

Answer 16

Single suction
Double suction

Question 17

T or F. Impellers can be open, semi-open, or enclosed

Answer 17

T

Question 18

It maintains a hydraulic balance of axial trust.

Answer 18

Balancing holes

Question 19

It is the loss of pumping capacity due to fluid leakage from the discharge side to the inlet side.

Answer 19

Pump slip

Question 20

It is used to maintain the pump’s minimum flow

Answer 20

Recirculation line

Question 21

It happens when a centrifugal pump operates with no flow through the pump due to a closed or blocked discharge valve.

Answer 21

Deadheading

Question 22

It is used to increase the discharge pressure of a pump

Answer 22

Multi-stage Centrfugal Pump

Question 23

Defined as that portion of centrifugal pump consisting of one impeller and its associated components

Answer 23

Pump stage

Question 24

T or F. Centrifugal pumps are self cooling

Answer 24

T

Question 25

What are the most common component of Centrifugal Pumps?

Answer 25

Wearing Rings Stuffing Boxes Packing Lantern Rings

Question 26

It is a replaceable component that is attached to the impeller and/or the pump casing.

Answer 26

Wearing Rings

Question 27

It is designed to be replaced periodically.

Answer 27

Wearing rings

Question 28

It is a space wherein packings materials are placed in.

Answer 28

Stuffing box

Question 29

This is stored in stuffing box that forms a seal to control the rate of leakage along the shaft.

Answer 29

Packing

Question 30

T or F. Stuffing boxes allow a small amount of controlled leakage along the shaft.

Answer 30

T

Question 31

This is a perforated hollow ring that distributes the liquid uniformly around the shaft.

Answer 31

Lantern Ring

Question 32

It is used as an alternative to adequately seal the shaft

Answer 32

Mechanical Seal

Question 33

These elements have highly polished rotating and stationary element that come into contact to form a seal.

Answer 33

Mechanical Seal