Member Login

Remember Me
Forgot Password?
Join Us!

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!

Join Eng-Tips
*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.

Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Mechanical run test

Mechanical run test

API 610 para states that pump, if specified, shall be run on the test stand until oil temperature stabilization has been achieved. Is VS4/VS5 grease-lubricated pump covered in the statement?Is "grease" covered in the word "oil" in the paragraph?I think grease and oil are different.

Thank you.


RE: Mechanical run test

Grease is composed of oil plus thickener.  Thickener does not lubricate the bearing.  The bearing is lubricated with oil.

It says "if specified."  If you want this test requirement, specify it.  If you do not want it, do not specify.  

For grease lubricated ball bearings, I would not specify this requirement

Johnny Pellin

RE: Mechanical run test

Grease is not covered. Grease is used to describe semisolid lubricants.

Oil viscosity changes with temperature. When temperature rises, an oil becomes less viscous. Hence, the temperature must be specified whenever a certain viscosity of a liquid is required.  

RE: Mechanical run test

The extended mechanical run test is to check bearing loading is not excessive. Over loaded bearing will have temperature keep on rising.
 During mechanical run test,the oil temperature or the bearing housing temperature for grease lubricated bearing are recorded at a fixed time interval. A Temperature Vs Time graph is plotted until the graph goes flat.. indicating the temp. has stabilised.i.e heat generated = heat dissipated.
The temp. rise over the ambient temp will be checked if it is within the limit specified.
Grease temp. is not mentioned because para 5.11.1 states, "unless otherwise specified, bearings and bearing housing shall be designed for oil lubrication...."

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!


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