Questions regarding the temperature of the balance drum and bearings in multi-stage centrifugal pumps
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A new batch of multi-stage centrifugal pumps was purchased, equipped with balance drums. Tests showed that the temperature rise at the drive end was normal, while the temperature rise at the non-drive end was 20°C higher than that at the drive end. Could it be that the balance drums were not functioning properly, resulting in excessive axial pressure on the non-drive end and thus causing abnormal temperature rises in the bearings?
The balance drum in multi-stage centrifugal pumps serves to balance the axial forces, and it should enable the bearings on the non-driving side to experience less axial pressure. If the test results show that the temperature rise on the non-driving side is 20°C higher than that on the driving side, this could be one of the reasons why the balance drum is not functioning properly. The bearing experiences abnormal temperature rise due to the large axial pressure on the non-driven side. It is recommended to check whether the balance drum is installed correctly, and whether there is any looseness or damage. Additionally, it is necessary to check other factors that may cause abnormal bearing temperature increases, such as whether the lubrication oil supply is proper and whether the bearings are damaged. If the problem cannot be resolved, it is recommended to contact the supplier or a professional technician for further diagnosis and handling. .
Thank you for your help. The manufacturer’s representatives are here now. It’s a new pump; we previously used pumps from another manufacturer, but they were unable to solve the problems either. It seems there’s an issue with the design, and I don’t know why we bought this pump again.