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3. Case study
3.1 Fan motor bearing fault
Here's how a diagnosis was carried out on a motorized fan unit at an incineration plant in the Paris region, driven at 2,420 rpm by a 300 kW motor and pulley-belt transmission.
The values measured during a periodic inspection show that, on the motor bearing on the pulley side, the alarm threshold defined for the global indicator "RMS speed" standardized to 10/1,000 Hz has been exceeded. The value of this global indicator, measured in the horizontal radial direction, has risen from 3.9 to 12.2 mm/s since the last collection, whereas it remains more or less stable on the other fan bearings and on the vertical radial measurements of the bearing in question.
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Measurement precautions
Bibliography
Standards and norms
- Mechanical vibration — Machine vibration measurement and evaluation — Part 1: General guidelines. - ISO 20816-1 - 2016
- Mechanical vibration — Machine vibration measurement and evaluation — Part 2: Gas turbines, steam turbines and fluid-film bearing alternators above 40 MW for land-based applications, with rated operating speeds of 1,500 r/min, 1,800 r/min, 3,000 r/min and 3,600 r/min. - ISO 20816-2 - 2017
- Mechanical...
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