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


Running Clearances for Vertical Can Pumps

Running Clearances for Vertical Can Pumps

Running Clearances for Vertical Can Pumps

Anybody knows what clearances should be between impeller wear ring and bowl wear ring in a vertical can pump?
I know that API 610 gives clearance data, but are they applicable also to can pumps?

RE: Running Clearances for Vertical Can Pumps

Wear ring clearance depends on how much leakage flow you can afford without degrading pump head. Stepanoff,A.J.(1957), "Centrifugal and Axial Flow Pumps" 2nd Edition shows in Fig. 10.4 on page 186, leakage in percent for 4 speeds at several clearances and grooved/plain, open/closed end geometries all for a 4.125 diameter seal. For a plain open-ended seal about 6-7% leakage occurs at 4 mils/inch  clearance ratio. At 9 mils/inch leakage loss is 18.7 to 20% at speeds from 1400 to 2500 RPM. If you can find loss factor C, data for a particular seal geometry you can calculate leakage flow from QL=CA*SQRT (2gH) where A is area and H is head. For labyrinth seals, a single tooth loss factor can be multiplied by tooth number minus 1.0. If high running speeds are involved, rotordynamic bearing properties of the seal clearance may become important and more controlling than leakage flowrate especially if impellers are substantially overhung from the lowest radial bearing. Sometimes, noise/vibration control may influence seal clearance selection to avoid exciting highly resonanant boundary structures like thin, bell-like impeller shrouds.

RE: Running Clearances for Vertical Can Pumps

Thank you Vanstoja for valuable information.

RE: Running Clearances for Vertical Can Pumps

Wear ring clearances are dependent on media, bearing material, wear ring material and the size of the pump.
If the pump is old take into account register clearances.
Your pump supplier should have a chart with standard wear ring / bearing clearances for any size pump, this should include ss on ss clearances which are greater than standard pump constructed clearances.


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! Already a Member? Login


White Paper - A Guide to 3D Printing Materials
When it comes to using an FDM 3D printer effectively and efficiently, choosing the right material at the right time is essential. This 3D Printing Materials Guide will help give you and your team a basic understanding of some FDM 3D printing polymers and composites, their strengths and weaknesses, and when to use them. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close