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15 Questions

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Pump Bearings in Centrifugal Pumps

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Questions and Answers

What are the only moving parts of a centrifugal pump?

Motor and impeller

Shaft and bearings

Impeller and shaft (correct)

Impeller and bearings

What is the function of pump bearings?

To support the impeller (correct)

To reduce friction in the pump

To regulate the speed of the motor

To hold the motor in place

What type of bearings are typically used by pumps?

Ball bearings

Shell (sleeve) bearings (correct)

Tapered roller bearings

Needle roller bearings

How are most centrifugal pumps driven?

By electric motors Signup and view all the answers

What is required for the pump and motor shafts to be coupled together for direct drive?

Shafts to be perfectly aligned Signup and view all the answers

Why is perfect alignment difficult to maintain during operation?

Due to alignment changes under load Signup and view all the answers

What does Figure 15(a) illustrate?

Angular misalignment Signup and view all the answers

What can cause misalignments of shafts connected by rigid couplings?

Poor installation or assembly Signup and view all the answers

What is one of the main problems contributing to misalignment according to the text?

Bearing wear Signup and view all the answers

What can flexible couplings compensate for during operation?

Misalignment due to poor installation Signup and view all the answers

Why do some equipment intentionally misalign at installation?

Due to temperature changes during operation Signup and view all the answers

What method is suitable for all types of couplings to accurately align shafts?

Micrometer dial indicators Signup and view all the answers

What is the standard industry practice for measuring misalignment?

Laser alignment Signup and view all the answers

What can be used to transmit precise laser measurements to a hand-held computer during laser alignment?

Shaft-mounted components Signup and view all the answers

What is used to calculate the misalignment and show where to shim the motor during laser alignment?

"Hand-held computer" Signup and view all the answers