when pump is maitaind throughly and installed perfectly then why pump vibrates

when pump is maitaind throughly and installed perfectly
then why pump vibrates on above standard vibration level?

Question Posted / rajiv kumar

4 Answers
7231 Views
IOCL, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / mohan tayade

Cavitation

Cavitation also can cause pump vibration. It occurs when the
system's available net-positive suction head (NPSHa) is less
than the pump's requirement (NPSHr). Indications of a
cavitating pump can include noise, fluctuating flow rates, a
decrease in discharge pressure, and vibration.
Cavitation-induced vibration is caused by imploding vapor
bubbles that introduce shock waves in a pump, shortening the
life cycle of all of the pump's mechanical components. The
components that commonly fail prematurely are impellers,
wear rings, and casings. If cavitation is present, NPSHa
should be increased above NPSHr by making changes in the
system design or operation to reduce or eliminate
cavitation. Cavitation does not always produce pump
vibration, and the induced vibration often is random and
unmeasurable.

Is This Answer Correct ?

12 Yes

0 No

when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / umesh parmar

Please check operating conditions,It shall be as per
Manufacturer's catalouge.

Is This Answer Correct ?

1 Yes

1 No

when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / dinesh

when it runs with out any liquid to pump

Is This Answer Correct ?

5 Yes

6 No

when pump is maitaind throughly and installed perfectly then why pump vibrates on above standard v..

Answer / jimit shah

wen there is more than 80% load on the pump

Is This Answer Correct ?

1 Yes

6 No

Post New Answer

More Mechanical Engineering Interview Questions

What are the causes of positive and negative propeller slip?

0 Answers RRB,

• What motivates you to do your best on the job?

2 Answers Petro Star Mount,

types of steel avaliable in india and how to select the right steel for the job?

1 Answers

resent profession and what would you define as your career objectives

0 Answers

What is the cause of cylindrical liner overheating?

0 Answers

The graphite in grey irons exists in the form of flakes which act as stress-raisers under tensile loading and consequently grey irons have relatively low tensile strength and ductility. Still grey iron is extensively used in engineering. Why ?

0 Answers

Why two stroke engine can’t be used in cars?

4 Answers

What is TOTAL ELONGATION of a tmt bar?

1 Answers

what is the function of a pt pump of a dg set

4 Answers

plz tell me the practical application of catia?

3 Answers

What is the effect on shunt motor's rotation if the polarity of the field and the armature winding increased simultaneouisly

1 Answers GDT, JKP,

what is the main purpose of deaerator in thermal power plants?

3 Answers Engro,

For more Mechanical Engineering Interview Questions Click Here