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


ISO 10816-3 : What's nominal power?

ISO 10816-3 : What's nominal power?

ISO 10816-3 : What's nominal power?

Hello guys,
I need your help in order to clarify the scope ANNEX B where are defined the different classes of machinery and the boundary vibration limits.

Class II: medium sized machines 15 kW < P < 300 kW
Class III: large sized machines 300 kW < P < 50 MW

I would like to know if the considered power (P) is referred to the installed power (for example the nominal power of the electric motor installed in a skid motor + centrifugal pump) or instead of that, the rated power of the driven machine (f.e. power consumption in the rated point of a centrifugal pump) which is of course less power than the installed one.

I have some new machines in the plant which are in one class or another depending on the considered power and we have to deal with the manufacturer which limits apply in each case.

Thank you so much in advnce for your kind help,


RE: ISO 10816-3 : What's nominal power?

The nominal ratings are based on reference conditions according to 298 K ( 25° Celsius ) air temperature, 100 kPa ( 1000 mbar ) air pressure, 60 % air humidity; deratings for site conditions to be taken into account.

The above appeared in the footnotes of the following doc,


So, it should be what's printed on the motor's nameplate data, more or less.  

There is possibly another clue given to finding an exact ISO definition appearing in some footnotes,


Power rating definitions according to DIN / ISO 3046-1 definition of engine application to ISO 8528-1

"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/

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 - How to Capitalize on HVAC/R Trends to Drive Business Growth
According to Steve Yurek, CEO of the Air Conditioning, Heating and Refrigeration Institute, the HVAC/R industry is facing change on all fronts. This includes challenging trends on contractors and distributors like new refrigerants, growing automation, complex sensors and monitoring, green initiatives and a technician shortage. We look at these trends and outline actionable insights on how it all can be turned into a competitive advantage and business opportunity. Download Now
eBook - Manufacturing the Cars of Tomorrow
In this ebook, we'll explore how additive manufacturing is going to transform the way cars are made. This includes commentary from thought leaders such as Ford's CTO, Ken Washington, Customer case studies of ways 3D printing is being used today, and a variety of part examples where 3D printing is already impacting how automobiles are made. Download Now
White Paper - Smart Manufacturing for Semiconductor
New technologies and approaches present great opportunities for semiconductor manufacturers to achieve high levels of innovation, yield and improvement. This white paper explores some of these cutting-edge technologies and how they can be applied effectively in the semiconductor industry. Read about how Smart Manufacturing is transforming the semiconductor industry. 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