Suction pumps often break down

Vibrations and damage to the mechanical seal in self-priming pumps when pumping sewage can be caused by the following reasons: 1. **Issues with the inlet pipeline**: If there is air leakage in the inlet pipeline or cavitation occurs within it, it will affect the pump’s ability to self-primed, resulting in unstable operation of the pump and vibrations. 2. **Wear of the pump body or impeller**: Pumping sewage containing solid particles over a long period can cause wear to the pump body or impeller, leading to an imbalance inside the pump, which in turn results in vibration and damage to the mechanical seal. 3. **Improper selection or installation of the mechanical seal**: If the type of mechanical seal is not suitable for the properties of the medium, or if it is not properly aligned during installation, this will reduce the service life of the mechanical seal and may cause vibration in the pump. 4. **Inappropriate operating parameters of the pump**: If the operating parameters of the pump, such as flow rate, head, and speed, are outside the designed range, it will affect the stable operation of the pump. 5. **Poor coupling between the motor and pump**: If there are issues with the connection between the motor and the pump, such as a misaligned coupling or loose fasteners, this can also cause the entire pump unit to vibrate. Solving these problems usually requires the following measures: - **Inspect and repair the piping system**: Ensure that the suction lines are properly sealed to prevent air from entering, and check for any signs of cavitation. - **Check the wear condition of the impeller and pump casing**: Regularly inspect and replace damaged components. - **Select the appropriate mechanical seal**: Choose the right type of mechanical seal based on the actual operating conditions, and ensure it is installed correctly. - **Adjust the pump’s operating parameters**: Adjust the operating parameters based on the pump’s performance curve to ensure it operates in the efficient range. - **Carefully inspect the connection between the motor and the pump**: ensure that the coupling is properly aligned and that the fasteners are tight. To address the above issues, it is recommended to start from the actual conditions on site and check each item one by one to rule out problems; if necessary, consult the pump manufacturer or professional maintenance personnel for guidance. .

The most critical issue arises during installation, when the contact surface between the mechanical seal and the shaft is damaged, resulting in a rough surface finish. The handling method is as follows: for surfaces with minor wear, they should be polished smooth using fine sandpaper. In cases where the damaged area is severe, welding followed by turning is required, and the surface must be polished to achieve a certain level of smoothness. In routine maintenance, a new mechanical seal is simply installed when it gets damaged, without repairing the damaged parts of the mechanical seal and the shaft surface. The intrusion of sewage leads to a decrease in surface smoothness, which in turn causes damage to the entire mechanical seal; proper treatment of the shaft’s surface smoothness during installation is crucial. For reference.

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