What are the pump failure analysis and troubleshooting methods?

    1. Fault phenomenon: the pump does not absorb water, the pressure gauge and the vacuum gauge pointer vibrate violently, or the vacuum gauge displays a high vacuum.

    Cause Analysis

    The pump is not filled with enough water;

    Suction pipe or meter leak;

    The bottom valve is not open;

    The suction pipe is blocked;

    The water absorption height is too large;

    Method of exclusion

    Water injection and deflation;

    Tightening the screw;

    Repair or replace the bottom valve;

    Cleaning the suction pipe;

    Reduce the water absorption height;

    2. Fault phenomenon: The pressure gauge has pressure, but there is no water or the flow is too small.

    Cause Analysis

    The flow channel is blocked, or the bottom valve is partially blocked;

    The pump speed is lower than the specified value;

    The total lift of the system is higher than the pump design lift;

    Gas entering the pump;

    The pump is not turning right;

    The parts are worn and the internal leakage is too large;

    Method of exclusion

    Clean the flow path or remove the foreign matter from the bottom valve;

    Increase pump speed;

    Increase the number of pump stages or reduce pipeline losses;

    Blocking the intake portion;

    Motor rewiring

    Replace worn parts;

    3. Fault phenomenon

    The motor current is too large.

    Cause Analysis

    The system lift is much lower than the pump design head;

    The pipeline broke and ran;

    The outlet gate valve is not closed at startup;

    The pump shaft is not concentric with the motor shaft;

    The rotating member rubs against the fixing member;

    Bearing wear;

    The rotor is unbalanced and generates vibration;

    The voltage is too low;

    Method of exclusion

    Close the gate valve to adjust, or reduce the number of pump stages;

    Stop the pump processing pipeline;

    Close the gate valve and restart it;

    Re-align to avoid system forces acting on the pump;

    Pump re-adjustment;

    Replace the bearing;

    Disassemble the rotor for static balance and dynamic balance detection;

    Increase the voltage;

    4. Fault phenomenon

    The stuffing box leaks a lot, the filler heats up and smokes, and the filler has a short life.

    Cause Analysis

    The pump shaft is not the same as the motor;

    The shaft is bent;

    Damage to the bushing at the packing, or improper packing installation, or incorrect packing type;

    There is impurity between the packing and the sleeve;

    Method of exclusion

    Re-align

    Disassemble and correct the shaft;

    Grind or replace the bushing, or reinstall the packing, evenly press or replace the packing;

    Replace the packing;

    5. Fault phenomenon

    The pump is vibrating or noisy.

    Cause Analysis

    Cavitation of the pump;

    The flow channel is blocked, or the bottom valve is partially blocked;

    The pipeline broke and ran;

    The outlet valve is opened and activated;

    The pump is not concentric with the motor shaft, or the shaft is bent;

    Insufficient foundation rigidity;

    The rotating member rubs against the fixing member;

    Impeller defect;

    Too much or too little grease in the bearing;

    The bearing is worn or has dirt inside;

    Method of exclusion

    Reduce the geometric installation height of the pump and reduce the resistance of the suction pipe;

    Clean the flow path or clean the bottom valve;

    Stop the pump processing pipeline;

    Close the gate valve and restart it;

    Re-align, or overhaul, change shafts;

    Reinforcement foundation;

    Disassemble and re-adjust the pump;

    Replace the impeller;

    Add grease to the right amount;

    Replace or clean the bearings and pay attention to the sealed bearings;

    6. Fault phenomenon: The bearing is hot.

    Cause Analysis

    The pump shaft and the motor shaft are not concentric, or the shaft is bent;

    The rotating member rubs against the fixing member;

    The bearing is damaged, or there is dirt or water in the bearing;

    Too much or too little grease in the bearing;

    Method of exclusion

    Re-align, or overhaul, change shafts;

    Disassemble and re-adjust the pump;

    Add grease to the right amount;

    Replace or clean the bearings and pay attention to the sealed bearings;