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!

*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

Salt Cake Slurry Gear Pump Failures

Salt Cake Slurry Gear Pump Failures

Salt Cake Slurry Gear Pump Failures

Hi there;

I am fighting a chronic problem with a mag driven gear pump pumping a sodium sulphate (salt cake) slurry.  Required flow is ~ 32 GPM against ~ 100 PSI, temps of 60+ Degrees C.  The pump is process lubricated and uses tungsten carbide main bushings with a chromium oxide coated shaft, 316 SS wetted parts.

We have had repeated failures of the pump (pump seizes).  When dissasembled the coating on the shaft is worn/damaged, opening up the bearing clearance and the pump.  The locknut/threads/key connecting the drive magnet to the shaft is often loose/damaged.  The wetted parts (main and idler gear) usually appear "as new" with little damage or wear visible.

At least one previous failure has been blaimed on severe cavitation when the pump suction was blocked, but this does not seem to be a root cause of the majority of failures; the manufacturer believes the metalurgy of the pump is right for the material we are pumping.

Any thoughts on possible causes of the failure, areas to investigate would be welcome!



RE: Salt Cake Slurry Gear Pump Failures

Maybe solids settling out of the pumpage in the bushings/insufficient flow through the bushings leading to wear, and subsequent vibration slackening off the coupling and locknut. I am not really keen on using gear pumps on suspended solids applications.

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


Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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