Please your comments:
Industry: Paper Mill
Area: Tissue Machine - third level
Assets: Hood circulation fans
Comments: Centrifugal fan, catiliver arrangement, grid coupling, 800 hp - 1780 rpm electric motor
Problem: High vibration (20 mm / s) 1xrpm in horizontal direction in a higher percentage in the free side bearing, this high vibration occurs with the burners at full load, with which temperatures of up to 500 oC are reached.
The fans are operated at very close speeds, usually with a difference below 100 rpm. Therefore Beat is presented
When the burners are off, the vibratory amplitudes register maximum 5 mm / s in the horizontal direction.
What do you think of this case?
“Rotor Mass Unbalance:Exposure to high air stream temperatures can cause uneven growth of the fan rotor.” ...???
Please your recommendations