Previous in Forum: invisible shield   Next in Forum: Alternative Formation of Nitronium Ions
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
Rate Comments: Nested
wingman1985
Power-User

Join Date: Jul 2009
Location: China
Posts: 146

Fluid Stiffening Effects

01/04/2010 1:31 AM

For multistage pumps, fluid stiffening effects shall be considered and calculations shall be performed at both one and two times the nominal design clearances. The fluid stiffness of product-lubricated bearings and bearing bushings shall be calculated at both one and two times the nominal design clearances.&

can somebody pls enlighten me ?

__________________
 I am not a home work cheater. I am a translator seeking professional help
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

These comments received enough positive votes to make them "good answers".
4
The Prof
Guru
Engineering Fields - Mechanical Engineering - New Member Hobbies - CNC - New Member

Join Date: Aug 2006
Location: Western Australia
Posts: 767
Good Answers: 58
#1

Re: what is "fluid stiffening effects"?

01/04/2010 2:02 AM

In simple terms, the interstage bushings (in particular) and the wear rings etc of a multistage pump act in a manner somewhat similar to lubricated bearings. The pumped fluid present in these relatively close tolerance areas has a stiffening effect on the shaft. (The fluid in the gaps dampens movement).

The larger the clearances the less effective is this dampening effect (fluid stiffening of the system), so API 610 requires that this effect be adequate at both normal and 2x normal clearances.

__________________
 If you can't explain it simply, you don't understand it well enough. (A.E.)
Register to Reply Good Answer (Score 4)
No more Good Answers.
Register to Reply
Have a Different Question?

Good Answers:

These comments received enough positive votes to make them "good answers".

Previous in Forum: invisible shield   Next in Forum: Alternative Formation of Nitronium Ions

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Chemical & Material Science:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (49 right now)
Show Members
Advertisement