Cyclic 1X amplitude and Phase

Following are details of Ammonia Refrigeration Compressor at our base unit


Type : Horizontally split
Inter stage Seals : Labyrinth (sealing surface of non metallic material)
End seals : Mechanical Seal with rotating face on mounted on rotor and spring loaded stationary face installed in casing. Contact between faces is axial i.e. face running surface is perpendicular to rotor axis.

Two perpendicular radial vibration probes are installed at non drive end bearing of this compressor. Also two perpendicular radial vibration probes are installed at drive end bearing of this compressor.

In December 2013 cyclic variation started in direct (unfiltered) values of all four vibration probes. ADRE data revealed cyclic variation in 1X amplitude and phase.
Polar Plots are attached

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Polar Plot form 2nd probe at non drive end is also attached.
Behavior of probes at drive end is similar. I will attach polar plots of probes at drive end in following messages
I have viewed spectrum with 11Hz resolution to evaluate possibility of any other frequency component close to 1X generating beats but this does not seem to be the case.

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