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The time intervals between observing or measuring the vibration of rolling bearings in industrial plants are so important in condition monitoring programs. For instance, some experts measure the vibration once a month, and others measure it once every two weeks.

How can we determine it?

Is there any ISO standard?

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  • $\begingroup$ In critical applications (e.g. jet engines) it is monitored continuously whenever the engine is running. $\endgroup$
    – alephzero
    Sep 27 at 15:30
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    $\begingroup$ Based on mtbf, running speed as a fraction of max permitted, load, working temperature, lubrication and cooling. Also based on the engineer's experience and even the use of a stethoscope to evaluate condition. At least that was what I discussed with the paper mill engineer years ago. $\endgroup$
    – Solar Mike
    Sep 27 at 15:55
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I know of no global standards for vibration monitoring.

Like all preventive/predictive maintenance items, these things need to be equipment-specific. These are the same considerations you would apply to any preventive checks, including autonomous maintenance checks. Considerations include:

  • process impacts (Loss of production)
  • equipment failure cost
  • installed back-up availability
  • likelihood of failure during interval (for example, a 3600 rpm motor is much more failure-prone than a 1200 rpm motor)
  • resources available for monitoring - people, money, and equipment

All the above can be applied to standard monitoring with a portable device, to hooking up to permanent transducers, or to continuous monitoring.

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Monitoring has been continuous for over 30 years in critical equipment in petrochemicals. Our rotating machinery guy liked to do it in two directions; Something about rotor swirl which helped him to predict. There must be substantial info some where .

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  • $\begingroup$ if you have the resources to do it continuously that would be an input $\endgroup$
    – Tiger Guy
    Sep 27 at 17:06
  • $\begingroup$ "rotor swirl" or "rotor whirl"? I don't know about your "two directions" comment, but IMO forwards whirl of rotors just wears things out very fast, but reverse whirl often makes a loud bang and a pile of broken bits, with very little warning! $\endgroup$
    – alephzero
    Sep 27 at 19:00
  • $\begingroup$ Swirl , The center of large turbine shafts wanders ( a little) in a regular pattern . Can't remember the name of the affect. Not my job, but was impressed walking through the motor stator of an axial flow air compressor ( Dresser built but the design was German) , the motor shaft was 14 in. diameter ; pardon old guy rambling. $\endgroup$ Sep 27 at 21:06

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