Base Plate Corrosion and Premature Bearing failure in RO Pump

Abstract

On 19th Aug 2017, abnormal noise noticed from RO (Reverse osmosis) Membrane Feed pump coupling area. Checked the vibration for pump & motor and found very high vibration at Pump Drive end. The vibration level at Pump DE Vertical recorded as 4.5 mm/sec (Allowable: 3 mm/sec Max.) Pump was stopped to identify the reason for the high vibration and abnormal noise. Checked the alignment and found the vertical offset at motor end coupling is 0.8 mm higher than the pump end. Customer has tried to perform the alignment with their own maintenance team and found there is no shim at motor foot to do the necessary correction. Customer has approached OEM Service team.