This part of ISO 10816 gives specific guidance for evaluating the severity of vibration measured on the bearings of steam turbines and generators. Guidelines are presented for in situ, broad-band vibration measurements taken in the radial direction on the bearings in terms of:
- vibration under normal steady-state operating conditions;
- vibration during transient operation, including passage through resonant speeds during run up or run down;
- changes in vibration which can occur during normal steady-state operation.
The guidelines also apply to axial vibration measured on thrust bearings.
This part of ISO 10816 is applicable to land-based steam turbines and generators with a normal operating speed of 1 500 r/min, 1 800 r/min, 3 000 r/min or 3 600 r/min, and power outputs greater than 50 MW. It also includes steam turbines and/or generators which are directly coupled to a gas turbine (such as for combined cycle applications). In such cases the criteria of this part of ISO 10816 apply only to the steam turbine and the generator. Evaluation of the gas turbine vibration should be carried out in accordance with ISO 7919-4 and ISO 10816-4.