When used on line shafting, support bearing should be locate near the coupling and checked for both static and dynamic balance.
although simple design, rigid coupling are generally restricted to relatively low speed application where good shaft aliment or shaft flexibility can be expected.
When fully closed, the fan is unable to discharge air and turbulence (vibration) can occur. If vibration continue, shutdown the fan, turn off the power supply and open the housing and inlet box access doors and inspect the rotor.
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It was used during the English Civil War (1642 - 1649) in the Siege of Colchester ( - ).
Connecting misaligned shaft with a rigid coupling can lead to bearing failure, fatigue shaft wore flange or broken flange bolt.
Vibration & Balancing Heavy rotors high peripheral speeds require static and dynamic balancing.
The level of balance should be so that the fan will run the "good" to "satisfactory" range at operating speed in accordance with the vibration chart.
If vibration happen on radial side perhaps got misalignment between fan as driven and motor as drive.
But if vibration happen on axial side, perhaps misalignment or something else.