1. Units of measurement : Rotary lobe blower vibrations are measured in inches/sec. Measurements of spike energy is not recommended for judging blower condition because the rotary lobe blower has inherent impacting bearing loads.
2. Measurement location : vibration should be measured at bearing locations on the housing
These are guideline for assessing rotary lobe blowers rigidly mounted on the stiff foundations.
Unfiltered Vibration ( in/sec peak)
>0.62 thru 1.0 ( satisfactory)
>1.0 ( review required)
If the blower is operating at "review required" levels then the installation must be fully evaluated to determine the source or cause of vibration and the cause shall be corrected.
In general, blower vibration levels should be monitored on a regular basis and the vibration trend observed for progressive or sudden change in level.
Rotary lobe blowers or rotary blowers, commonly called boosters in high vacuum application, are not used as a stand alone pump. In high vacuum applications the boosters pumping speed can be used to reduce the end pressure and increase the pumping speed.
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