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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/

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