Mechanical vibration—Evaluation of machines vibration by measurements on rotating shafts—Part 2:Land-based steam turbines and generators in excess of 50 MW with normal operating speeds of 1 500/r/min，1 800 r/min 3 000 r/min and 3 600 r/min
1 Scope
This part specifies measuring method and evaluate criteria for radial vibration of rotating shaft located at or near bearing of turbines and generators; they include:
- Vibration under working condition of normal and stable operation;
- Transient vibration including raising speed or deceleration by resonance speed;
- Vibration changes generated under working condition of normal and stable operation.
In a general way, vibrational state of turbines and generators shall be evaluated on two aspects of vibration on rotating shaft and bearing block.
This part is applicable to steamship sails and generators with the normal operating speeds of 1 500 r/min, 1 800 r/min, 3 000 r/min and 3 600 r/min and the power above 50 MW; it’s also applicable to turbines and generators (such as combined cycle application) connected with combustion gas turbines directly; here the criteria of this part can only be used for turbines and generators. Vibration of combustion gas turbine shall be evaluated according to GB/T 11348.4 and GB/T 6075.4.
2 Normative References
The following normative documents contain provisions which, through reference of GB/T 11348 in this part, constitute provisions of this part. For dated normative references, thereof whereafter all the change notifications (excluding correction contents) or revisions are not applicable to this part without exception. However, parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, thereof latest editions are applicable to this part.
Contents
1 Scope
2 Normative References
3 Measuring Method
4 Evaluation Criteria
Appendix A (Normative) Area Limit value for Evaluation
Appendix B (Informative) Limit value for Bearing Clearance and Evaluation area
References
