Single-stage horizontal centrifugal pump: normal rotation before major repair, but the motor current gradually increases!
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It is a single-stage horizontal centrifugal pump. It rotated smoothly before the major repair, and after the repair all its technical specifications met the standards. However, the motor current continued to rise gradually, increasing by 2–3 A per day. Could someone please give some advice?
What is the bearing temperature? Has it reached equilibrium? Is there any change in the outlet pressure gauge?
How long has the current been increasing? Is it rising by 2-3A every day? Has the density of the medium not changed?
It appeared suddenly, and it stopped working once the voltage rose from 22A to 27A; the same problem persisted even after the pump was overhauled!
The medium is diesel, so it is not affected; the opening degree of the outlet valve remains unchanged.
Is it caused by the operating temperature rise? Could it be that the bearing clearance is too small? What about the vibration noise?