Why is the current too large when the motor is running and how to deal with it?
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Causes: overloaded pump, low voltage, shorted winding, or bearing failure causing friction. Solutions: check discharge pressure and flow rate, verify supply voltage, inspect motor windings for shorts, and check bearing condition and lubrication.
What should be done when local corrosion signs appear on the surface of the pump body?
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Actions: 1) Identify the cause of corrosion (fluid mismatch, temperature, etc.), 2) Assess depth and extent of corrosion, 3) If superficial, monitor closely, 4) If structural integrity is compromised, replace the affected component, 5) Verify material compatibility with the process fluid.
What is the reason for the sudden increase in the head of the pump and how to solve it?
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Causes: discharge valve partially closed, clogged discharge line, or system demand reduced. Solutions: check discharge valve position, inspect piping for blockages, verify system requirements, and consider VFD or pressure relief if over-pressure is a recurring issue.
What is the reason for the fluctuating flow rate of the pump and how to solve it?
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Causes: fluctuating suction level, air entrainment, partially clogged impeller, or unstable system pressure. Solutions: stabilize suction conditions, check for air leaks in suction line, inspect and clean impeller, and install pressure stabilization if needed.
What is the reason for the vibration of the pump body accompanied by a sharp sound?
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Causes: cavitation, impeller striking volute, loose components, bearing failure, or foreign object inside pump. Solutions: check suction conditions for cavitation, inspect impeller clearance, tighten all mounting bolts, check bearing condition, and inspect for debris in pump casing.
Why is the rotation speed of the motor extremely slow after startup and how to deal with it?
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Causes: low supply voltage, excessive load, motor winding issue, or mechanical binding. Solutions: measure and verify supply voltage, check if pump is jammed (rotate manually), inspect motor capacitors (single-phase), and verify pump is not oversized for the application.
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