BS 848-6:1989
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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Fans for general purposes Method of measurement of fan vibration
Hardcopy , PDF
11-06-2003
English
30-03-1990
Foreword
Committees responsible
Method
Section one. General
1. Scope
2. Definitions
3. Symbols and units
Section two. Method of measurement
4. Mounting of test rig
4.1 General
4.2 Resilient base mounting of fan
4.3 Resilient elastic rope mounting of fans
4.4 Stiff mounting of fans
4.5 Flexible connections
5. Calibration
5.2 Instrument system
5.3 Transducers
5.4 Piezoelectric accelerometers
5.5 Preamplifiers
5.6 Analysers
5.7 Indicators
5.8 Outputs
6. Transducer attachment
6.1 General
6.2 Attachments
7. Selection of measuring positions
7.1 General
7.2 Mounting on combination base frame
8. Test environment and operating data
9. Procedure
9.1 General
9.2 Measurement parameters
9.3 Frequency analysis
10. Presentation of results
Appendices
A. Guide to calculating resilient mount positions
and rigid body natural frequencies
B. Secondary measurement methods for in situ testing
or quality grading
C. Recommended measuring positions for machinery
health measurements
D. Relationship between absolute and decibel levels
E. Relationship between vibration magnitudes of
single frequency signal
Tables
1. Recommended maximum frequencies for transducer
mouting
2. Reference levels
Figures
1. Example of resilient mounting arrangement of a
fan vibration test rig
2. Example of arrangement for testing roof extraction
fan
3. Degrees of freedom
4. Examples of resilient elastic rope mounted fans
5. Nominal value of relative sensitivity and limits
of permissible deviation
6. Typical mounting block for transducer
7. Recommended measuring positions for axial flow
fans
8. Recommended measuring positions for centrifugal
fans
9. Example showing an indirectly driven centrifugal
fan assembly on resilient mounts
10. General layout of a centrifugal fan assembly on
resilient mountings
11. Recommended measuring position for machinery
health measurement of axial flow fans
12. Recommended measuring position for machinery
health measurement of centrifugal fans
13. Machine vibration nomogram to convert absolute
values to decibel levels (sinusoidal wave form)
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