×
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

diaphragm pump question

diaphragm pump question

diaphragm pump question

(OP)
With a triplex diaphragm setup (this paticular setup has 3 EV2 pumps 120 deg phase difference) is it possible for a worn coupling to affect the "timing" enough to cause flow deviations. These deviations are within our tolerances, but we would rather see a smoother trend. The couplings are EPDM grid type made by TB woods. I've taken vibe data on the heads close to the discharge ball check to try and pick up anything out of the ordinary. What I have found is that Head 1 and H2 have basically "sinusoidal" harmonic amplitudes of 1X whereas H3 shows peak then basically straight fall of harmonics. After replacing grids H3 became "sinusoidal". Is it possible that worn grid could cause a "lag" effect with third head attributing to trend deviations. We are considering "hard" type coupling to eliminating this. Just curious if anyone else has experienced this phenomenom. Or should we be looking elsewhere  

Roy Gariepy
Maintenance and Reliability Dept.
Bayer Corporation  Dorlastan Fibers Div.
Goose Creek, South Carolina  USA

RE: diaphragm pump question

Hi,

If you want a smoother (non-pulsating) flow, then gear-pumps or tri-lobe pumps might be a good idea?

Cheers!

RE: diaphragm pump question

micjk, with reciprocating action in pumps, you will always have pulsating type flow which shows up in the frequency response. This type of behaivor is more pronounced in the lower number of pump systems, such as duplex or triplex, but is also apparent in the higher number systems such as, septuplex and nonuplex systems, but the pulsating flow is not as pronounced.

One solution to the problem is to install pulsation dampeners on the suction and discharge side of the pumps, or to install, or modify the piping such that it becomes a Helmholtz Resonator, Quarter Wave Stub, Surge volume, or a Helmholtz Filter. The choice of any of these items is dependant upon the Attenuation characteristics exhibited by the system and the properties of the process medium. There is a good study on this in the Cameron Hydraulic Data book put out by Ingersoll-Dresser Pumps.

Another solution is to replace the reciprocating action with rotary action. Since the diaphragm pump was probably spec'd. for the fluid characteristics, a progressing cavity pump would probably do the job for you, if you want to make the capital investment.

Hope this helps.

saxon

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