Industrial Heating

IndustrialHeating.com ■ MAY 2015 43

riod to take related impact into account when defining custom-
ized warning and alarm thresholds. Intermittent input of dust
and particles can lead to application- and production-specific
single events that must be separated in the monitoring task.
The overall view includes pump-specific parameters as well
as external characteristics coming from the furnace and the
application. The targeted result is to maximize zone B for safe
mode in permanent operation. Predicted change from zone B
to zone C is indicated by the defined warning level. Alarm level
is the equivalent indicator that reports high risk of unscheduled
downtime and trend development to zone D.

Understanding the Root Causes of Vibration
For integration of vibration monitoring into a total productive
maintenance concept, it is mandatory not only to react to alarms
but to understand the root cause behind them. Any failure or
wear offers potential to anticipate future optimization. Detailed
vibration analysis performed by experts enables the separation of
normal wear from external causes.
The vibration sensor provides a time signal that is
translated into a frequency spectrum by FFT (Fast-Fourier-
Transformation). Analyzing both time signal and spectrum
allows the detection of typical signs of wear by separating
bearing-specific patterns.

The general pump condition can be evaluated from the trend

analysis, which is a summary of individual monitoring tasks. A

trend chart combines development of bearing characteristics and

external vibrations coming from the environment since start-up

or appearing later within the production period. Unexpected

impacts during operation are also displayed. This can be a

one-time event like a significant dust intake, which is shown as

a peak within a generally stable chart. Intermittent impacts are

the equivalent peaks if they can be indicated as periodic peaks.

Conclusion

Vibration monitoring systems for dry-compression pumps in

heat-treatment applications offer huge potential to maximize

equipment uptime and reduce risk for cost-intensive unscheduled

downtime. Compared to the potential downtime cost, condition-

based maintenance offers attractive return on investment (ROI)

and supports a continuous-improvement process for maintenance

management and system engineering.

For more information: Contact Mario Vitale, senior manager –

marketing and sales support, Oerlikon Leybold Vacuum USA, Inc.,

5700 Mellon Road, Export, PA 15632; tel: 724-325-6565; fax:

724-325-3577; e-mail: [email protected]; web: http://www.

oerlikon.com/leyboldvacuum

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