Large fluctuations in the liquid level of the sump: solutions to pump-related problems
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Here’s what happened: The high-level tank is equipped with two level gauges – one is a flap level gauge and the other is a differential pressure transmitter. The level shown on the control panel fluctuated greatly, ranging from 3.78 to 4.08 meters; an alarm was triggered once the level dropped below 4 meters. The instruments on site indicated that the plant should be shut down, as the ball valve couldn’t be closed properly. And what worries me the most isn’t this; it’s the actual level of the liquid. Everyone knows the function of a surge tank – it’s used for pressurization. The liquid level relative to the other high-level tank is 5.12 m. I can’t stay calm at all; I’ve done some analysis on it. I hope fellow users can help with the analysis: 1. Is the differential pressure transmitter damaged? Are there any signs of that? Is the liquid level fluctuating greatly? Is the pressure at the positive pressure port or the negative pressure port unstable? I’m not sure about this 2. Regarding pump problems, if the impeller is malfunctioning, it can be detected by listening to the sound, but there are no unusual sounds! 3. Motor issues: How can we determine if there are motor problems? Is there significant current fluctuation? (Perhaps it’s possible to tell by reversing the pump, but please provide more detailed explanations. Thank you.)
Is there an overflow line, as observed through the overflow sight glass? Cut off the oil filling valve and take a look. There are no pictures, so it’s hard to tell; it seems like the instrument panel is the main issue.
As mentioned above, observe the overflow pipeline during testing; you can also check the indication of the magnetic flap level gauge