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

Hydraulic pump leak detection.

Hydraulic pump leak detection.

Hydraulic pump leak detection.

Just wondering if anyone has any experience with this?  The company I am working for currently dunk test their pumps in water to check for leaks.  I think dunk testing is a good, quick test, but it absolutely terrible for our application, as water and hydraulic systems don't get along.  Some current methods of leak detection I am looking into are:

Pressure Decay testing, which is very good, but very expensive.  And ultrasonic leak detection, which is fairly cheap, but I keep reading mixed reviews.

Does anyone have any experience with these two methods?  Any insight is greatly appreciated.

RE: Hydraulic pump leak detection.

What is the test fluid?
Why do you think water and hydraulic systems do not get along?


RE: Hydraulic pump leak detection.

The only reason I could surmise from the comment "water and hydraulics don't get along" is if the pump case is corroding after being dunked and/or the pump internals are exposed to water and similarly corroding.

One could:

 - add corrosion inhibitor to the dunk tank water.  
 - Add a step to air blast water off the pump before disconnecting the pressurization fittings.
 - immediately place the tested parts into a warm oven/air blast dryer, or heated vacuum chamber, to speed drying.

Doing all 3 would probably reduce corrosion concerns to zero.

RE: Hydraulic pump leak detection.

Going further, you could also dunk the pumps into a bath of light oil...

or use a helium leak tester...


RE: Hydraulic pump leak detection.

Let me go a little more in depth.

We build the pump then attach fittings and plugs to make it air tight.  Then we connect air at ~ 15 psi and dunk it in a tank of water with a rust inhibitor.  Once that is completed, the excess liquid is blown off the pump and then the pump is tested and set at the customers specifications.

Our main concern is somehow introducing water inside of the pump, which will cause a lack of lubrication between mating surfaces and eventually the pump will score.

So I am just wondering if anyone has experience with leak testing and have offer any good insight.

RE: Hydraulic pump leak detection.

Your final test and setting process will fill the pump with lubricating fluid and leave a lubricating residue.  We tested parts with nitrogen and the part dunked in solvent and looked for bubbles.
Check for leaks with the same setup used for testing and setting the pump.  Skip the water dunk test if it is too much of a concern.


RE: Hydraulic pump leak detection.

This might not meet your goals on the suction side, but could you add Spectroline leak detection to the fluid used on the test stand, then use the UV light detection for leakage when the pump is under pressure testing?   Or do you need to detect leaks before hooking it up to the test stand?


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


eBook - Integrating the Engineering Ecosystem
Aras Innovator provides multiple options for integrating data between systems, depending on the scenario. Utilizing the right approach to meet specific business requirements is vital. These needs range from authoring tools, federating data from various and dissimilar databases, and triggering processes and workflows. Download Now
White Paper - Industry 4.0 and the Future of Engineering Education
With industries becoming more automated, more tech-driven and more complex, engineers need to keep their skills and knowledge up to date in order to stay on top of this wave—and to be prepared for the Industry 4.0 future. The University of Cincinnati offers two online Master of Engineering degree programs designed specifically for practicing engineers. Download Now
eBook - The Design Gridlock Manifesto
In this eBook, you’ll learn 6 ways old CAD technology slows your company down and hear how design teams have put those problems to rest. “The Design Gridlock Manifesto” shares first-hand modern CAD experiences from 15 companies around the world. Download Now
White Paper - Comparing Multi-Patterning at 5nm: SADP, SAQP, and SALELE
Self-aligned multi-patterning techniques such as SADP, SAQP, and SALELE are increasingly popular at advanced nodes, but each process has its pros and cons. IMEC and Mentor, a Siemens business collaborated to identify potentially less-obvious process and design limitations and trade-offs between the three SAMP techniques. Learn more in this paper. 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