Case Study 1: Severe Vibration on Pump
Pump's nameplate
In a well-executed pump installation/layout, it is essential to incorporate throttle valves in the pump's discharge lines. This measure ensures the regulation of pressure to match the specified or rated pressure outlined in the pump curve. As there are no discharge valves, the following issue occurs:
Pump Performance Curve
In the absence of a control/discharge valve, the pump tends to operate to the right side of the curve, as the specific pumps were found to be operating at 1.3 bar (g) instead of the designated pressure of 2.2 bar (g) (refer to the curve below), the 1.3 bar (g) shows a higher flow of 18 m3/h instead of 10.8 m3/h (rated flow). As the pump operates beyond the maximum allowable flow, the operating ampere exceeds the Non-overloading Limit (NOL), resulting in high amperage. Consequently, the pump experiences severe cavitation and vibration, ultimately leading to premature failure.
The level of liquid in the sump is lower than the minimum required level. Thus, dry running occurs. The sleeve bearing for one of the pumps is damaged as it may be subjected to dry running. Dry running should not be allowed even for a short period as the sleeve bearings require constant lubrication from the pumped media.
Sleeve Bearing Lubrication
The gauge should be located between the Pump Flange and the Discharge Valve in order to read the Operating Pressure of the pump.
Installation of 2 units VS-4 Vertical Sump Pump
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