SKF CMSS500 Series, User Manual, Page: 67 / 76

SKF Machine Condition Transmitter B- 1
User Manual
Appendix B
General Severity Level Guidelines
When considering severity levels, be aware that
standards can only provide general guidelines to
determine initial alarm settings. Such guidelines should
never substitute experience and good judgement. The
most reliable method of determining alarm settings is to
trend vibration readings over time, establish baseline
values and alarm settings above baseline values.
Vibration measured in Velocity
For vibration velocity, ISO standards, such as ISO 10816,
First Edition 1995, or VDI 2056 guidelines, are generally
accepted. ISO 10816 with the title 'Mechanical vibration
- Evaluation of machine vibration by measurements on
non-rotating parts' consists of six parts. Part 1 (10816-
1) determines general guidelines and is followed by the
additional parts of ISO 10816, for example Part 2
(10816-2) for land-based steam turbines and generators
in excess of 50 MW with normal operating speeds of
1500 RPM, 1800 RPM, 3000 RPM and 3600 RPM.
The following severity chart is in accordance with the ISO
10816-2 guidelines. For exceptions to this guideline and
for more information, reference the ISO 10816-2
document.