×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

possible vibration causes based on spectra?

possible vibration causes based on spectra?

possible vibration causes based on spectra?

(OP)
Hello all...

Currently we have a single stage, horizontal centrifugal pump which pumps brine...it runs at about 1190 rpm.

I gathered vibration data on the outboard pump because the pump kept shutting down on high vibration.  The resulting spectra in the horizontal, vertical, and axial directions had the following characteristics:

Horiz: Raised noise floor from 300-20,000 CPM; significant peak at 4770 CPM (which turns out is  blade pass freq.) = .135 ips, minor raised noise floor from 20kCPM-60kCPM

Vert: More significant raised noise floor from 0-10,000 CPM then drops off drastically (flow turbulence?), again peak at blade pass frequency = 0.035 ips, raised noise floor around 60kCPM

Azial:  Significant raised noise floor from 0-10,000 CPM, smaller raised noise floor throughout rest of spectrum, again peak at 4770 CPM with amplitude of 0.054 ips

There are no indications on the spectra of bearing frequencies, unless they are mixed up with the raised noise floor further out in the spectrum.

Anyone have any thoughts on to what may be causing such vibrations?  

I must also mention that earlier during the day, this particular pump would run for some time, then instantaneously shutdown on high vibrations...

I'm new to vibration analyzation and am unsure as to what may be causing this ?  Any input is greatly appreciated.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources