This part of ISO 10816 gives specific guidance for assessing the severity of vibration measured on the bearings of steam turbine generator sets.

It is applicable to steam turbine generator sets exceeding 50 MW with a normal operating speed of 1 500 r/min, 1 800 r/min, 3 000 r/min or 3 600 r/min. It includes steam turbines and generators which are directly coupled to a gas turbine (such as for combined cycle applications), but in such cases the criteria of this part of ISO 10816 apply only to the steam turbine and the generator.

NOTE 1 Evaluation of the gas turbine vibration should be carried out in accordance with ISO 10816-4.

The criteria apply to in situ, broad-band vibration measurements taken in the radial direction on the bearings under steady-state operating conditions at the normal operating speed. They also apply to axial vibration measured on thrust bearings.