DANSK DSF/ISO/FDIS 20816-5 PDF

This part of ISO 20816 provides guidelines for evaluating the bearing housing vibration measurements made at the bearings, bearing pedestals or bearing housings and also for shaft vibration measurements made on machine sets in hydraulic power generating and pump-storage plants when the machine is operating within its normal operating range. The normal operating ranges for each type of turbine covered by this part of ISO 20816 are defined in Annex A. These guidelines are presented both for running vibrations and for any changes in amplitude or phase which can occur in those vibration values. The numerical values given in Annex A are intended to serve as the basis for vibration evaluation and, if required, further investigation. It is recommended in this part of ISO 20816 that the condition of a machine is assessed by consideration of both the bearing housing vibration and shaft vibration. This part of ISO 20816 is applicable to machine sets in hydraulic power generating plants and in pumpstorage plants with typical rotational speeds of 60 r/min to 1000 r/min fitted with shell or pad (shoe) type oil-lubricated bearings. NOTE – The present database (2013) includes machine speeds ranging from 60 r/min to 750 r/min (with a very small sample of 1000 r/min machines). This part of ISO 20816 defines different limit values of bearing housing and shaft vibration depending on the type of turbine, the orientation of the shaft (i.e. horizontal or vertical) and for each of the bearing locations. This part of ISO 20816 is based on statistical analysis and provides criteria for the most common types of turbines, pump-turbines and pumps. For specific information on which types of units are covered, see Annex A. Machine sets covered by this part of ISO 20816 can have the following configurations: a) generators driven by hydraulic turbines; b) motor-generators driven by pump-turbines; c) motor-generators driven by hydraulic turbines and separate pumps.