When it is needed
- Vibration readings have risen above the plant's alarm level
- A fan has had an impeller repair, a blade change or a build-up of material
- Bearings fail early and keep failing
- A new fan is being commissioned and the baseline needs recording
- Noise or vibration is felt in the structure, not just at the fan
What we do
- Measure vibration velocity and displacement at the bearings in three planes, with a spectrum to separate the frequencies
- Read the spectrum: once per revolution points to unbalance, twice to misalignment, blade pass to aerodynamic problems, bearing frequencies to the bearing
- Balance the rotor in situ by trial weights, in one or two planes as the rotor needs, to the grade the duty calls for
- Correct what balancing cannot: alignment, foundation bolting, clearances, resonance
- Record before and after readings against the severity chart
What you get
- A vibration report with spectra, the cause and the correction done
- A rotor balanced to grade G 6.3 or G 2.5 as per ISO 21940-11, with the record
- A baseline for the plant's condition monitoring to work from
Balancing cures unbalance. It does not cure a bent shaft or a soft foundation, and a fan balanced on top of either will shake again within the month. That is why the analysis comes first.
Fans this applies to
ID FanFD FanPA FanPreheater FanRaw Mill FanCoal Mill FanBag Filter FanHigh Pressure BlowerMVR Blower