FCC Power recovery train axial vibrations
FCC Power recovery train axial vibrations
(OP)
In our FCC power recovery train flue gas expander, air blower and steam turbine are on one shaft @4185 rpm and motor/generator is on other shaft@1500 rpm. both these shafts are connected via a gear box.All the machines are protected by giving axial displacement high high trip.
For Expander it is +0.57mm & -0.45mm, for blower +0.4mm to -0.65mm, for turbine +0.4mm to -0.65mm and for gear box 0.5mm. my questions are:
1. How these values are decided (+ and - values are different).
2. For blower and turbine - value is greater than + but during normal running it shows around +0.2mm reading.
3. gear box axial vibration trip is on + value only but during normal operation it -0.2 mm.
Thanks and regards.
For Expander it is +0.57mm & -0.45mm, for blower +0.4mm to -0.65mm, for turbine +0.4mm to -0.65mm and for gear box 0.5mm. my questions are:
1. How these values are decided (+ and - values are different).
2. For blower and turbine - value is greater than + but during normal running it shows around +0.2mm reading.
3. gear box axial vibration trip is on + value only but during normal operation it -0.2 mm.
Thanks and regards.





RE: FCC Power recovery train axial vibrations
Johnny Pellin
RE: FCC Power recovery train axial vibrations