Problems with shaft turning in centrifugal compressor units
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The domestic steam turbine compression unit has been installed, but the oil cleaning process for the unit is not yet complete. At present, the project is on hold and inactive. Is it permissible to rotate the bearings periodically when they are without oil?
Logically, turning the shaft is not allowed without oil, but failing to do so for a long time can cause the shaft to bend; therefore, oil should be applied at the bearing locations and the shaft turned!
Generally, it is not allowed to turn the rotor continuously for long periods, but the rotor can be straightened regularly.
Turning the shaft is not allowed when there is no oil, but failing to do so for an extended period is harmful to the shaft; therefore, it should be turned regularly with oil added.
If the oil washing is not completed, it is not recommended to turn the shaft. However, there is a way: the bearing cover can be removed, some oil can be added, and then the rotor can be rotated without causing any damage to it.
Cranking is not allowed if the oil circulation is not properly established. However, the purpose of cranking is to prevent bending due to stress and deformation caused by large temperature differences; therefore, it is necessary to find a way to crank the shaft 360 degrees on a regular basis
Doesn’t rotating the crank 360 degrees bring it back to its original position?
The compressor rotor is in a horizontal, stationary position; it may bend, so it is necessary to turn the rotor. The emergency oil pump should be started to supply oil to the bearings in order to turn the rotor.
Under normal circumstances, the crank should be turned once every ten days, by 90 degrees or 270 degrees each time.
Uh, I was wrong; it’s 180 degrees, then stop for a while, and turn another 180 degrees to return to the original position
Keep turning the shaft manually, and try to minimize the number of such turns