Atmospheric tower bottom pump shaft seizure
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One of the bottom pump units in our plant (with a flow rate of 100 m3/h, pressure of 2.4 MPa, temperature of 338°C, and head of 240 m) seized within less than a minute after its bearings were repaired and replaced. Could you help analyze the reason for this?
One of the bottom pump units in our plant (with a flow rate of 100 m3/h, pressure of 2.4 MPa, temperature of 338°C, and head of 240 m) stopped working after less than a minute of operation following bearing replacement; could you help analyze the reason? The pump had already experienced one instance of the impeller back cover loosening before this bearing replacement.
It’s likely there’s a problem with the bearing positioning on the non-drive side
1. Inspect the pump shaft: check aspects such as hardness, end face runout, and dimensions. 2. Bearing alignment: check for shaft play; please suggest any other methods if available
At what level of wear on the pump shaft is it no longer necessary to carry out repairs?
Loose back caps can cause changes in axial play, leading to friction and changes in axial force.
There are also many possible reasons for shaft binding, such as shaft bending, too small a gap in the sealing ring, insufficient hardness of the sealing ring, poor quality of the bearings, defective components of the pump, and improper assembly.
The reasons may be 1: poor bearing lubrication (insufficient oil or poor oil quality)； 2. Reason for installation: There are issues with the clearance between the bearing and the shaft or bearing housing, as well as with the axial tension of the bearing. 3. There are problems with the manufacturing quality of the bearing or with its selection