×
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

Fuel Gas Screw Compressor with axial high vibration

Fuel Gas Screw Compressor with axial high vibration

Fuel Gas Screw Compressor with axial high vibration

(OP)
Hi all,

I have a screw compressor, which is fuel gas compressor. It has 4 female/6male screws no timing gear. The customer want to reduce vibration because they had to welding cracked pipe and structure caused by high vibration.

The highest vibration freq. is 4x rpm, it could be screw mesh freq. I guess. And, the direction is axial.
Hor. and ver. vibratin is about 4mm/sec but axial is 17mm/sec. Not to mention, dominant freq. is 4x rpm.
I also checked the structure vibration, exactly this 4x rpm is main vibration on the structure and pipe.

I suspect that the high vibration would be main cause for pipe crack. I checked vibration data from several points, on both side of Compressor and some points of pipe lines. Whole machine including structure is rattling. The source of that is 4x rpm(14325cpm). The running speed of Compressor is 3550 rpm.

Highest vibration is 5.411 G, Peak to peak on that freq.
It is equal to 23.588 um(PtP), 0.929 mils.
Autally, We had to fix the crack of some pipe lines and structure frames until now.


I also suspect the resonance in the pipe.
But, I would like to reduce the source of vibration. That is best way to avoid the resonance.


I need your help for reducing this vibration.
If you have any information and experience, Please tell me about anything.

RE: Fuel Gas Screw Compressor with axial high vibration

Typically the air end motor assembly is isolated from the framing structure by vibration mounts and soft pipe joints.  The other route is to make a torsionally rigid base again with soft pipe joints.  The next area to look at is the coupling alignment your TIR should be no greater than 0.002 in/in of coupling diameter.

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