h high head slurry pumps

How to troubleshoot a slurry pump with abnormal noise? - Blog

1. Check the Pump Installation

The first step in troubleshooting abnormal noise is to examine the pump's installation. A poorly installed pump can cause excessive vibrations and noise. Ensure that the pump is correctly aligned with the motor. Misalignment can put extra stress on the bearings and coupling, leading to abnormal noise. Use precision alignment tools to check and adjust the alignment if necessary.

Also, verify that the pump is firmly mounted on a stable foundation. Loose mounting bolts can cause the pump to vibrate and produce noise. Tighten all the mounting bolts to the specified torque. If the foundation is not level or is too weak, it may need to be reinforced or replaced.

2. Inspect the Impeller

The impeller is a crucial component of the slurry pump, and any damage or imbalance can result in abnormal noise. Start by shutting down the pump and removing the access cover to visually inspect the impeller. Look for signs of wear, such as erosion, corrosion, or cracks. A worn - out impeller can disrupt the flow of the slurry, causing turbulence and noise.

If the impeller is damaged, it should be replaced. When installing a new impeller, make sure it is properly balanced. An unbalanced impeller can cause the pump to vibrate, which in turn generates noise. You can use a dynamic balancing machine to balance the impeller accurately.

3. Examine the Bearings

Bearings play a vital role in the smooth operation of the pump. Worn or damaged bearings are a common cause of abnormal noise. Listen carefully to the noise to determine if it is coming from the bearing area. A grinding or growling noise often indicates bearing problems.

Check the bearing lubrication. Insufficient lubrication can cause increased friction and heat, leading to premature bearing failure. Make sure the bearings are lubricated with the correct type and amount of lubricant as specified by the pump manufacturer.

If the bearings are severely worn or damaged, they should be replaced immediately. When replacing the bearings, ensure that they are installed correctly and that the bearing housing is clean and free of debris.

4. Analyze the Seal System

The seal system of the slurry pump is designed to prevent leakage. However, a faulty seal can also contribute to abnormal noise. Check the mechanical seals for signs of leakage, wear, or damage. A leaking seal can allow slurry to enter the pump's internal components, causing corrosion and noise.

Inspect the seal faces for scratches or uneven wear. If the seal faces are damaged, the seals may need to be replaced. Also, ensure that the seal flush system is working properly. A lack of proper flushing can cause the seals to overheat and fail, resulting in noise.

5. Evaluate the Pump's Operating Conditions

The operating conditions of the pump can have a significant impact on its performance and noise level. Check the flow rate and pressure of the pump. If the pump is operating outside its recommended range, it can cause cavitation, which is a major source of abnormal noise.

Cavitation occurs when the pressure in the pump drops below the vapor pressure of the slurry, causing the formation and collapse of vapor bubbles. This process can produce a loud popping or cracking noise. To prevent cavitation, adjust the pump's speed, impeller diameter, or the system's piping configuration to ensure that the pump operates within its optimal range.

Also, check the quality of the slurry being pumped. If the slurry contains large particles or abrasive materials, it can cause excessive wear and noise. Consider using a pre - screening system to remove large particles before the slurry enters the pump.

6. Review the Piping System

The piping system connected to the pump can also be a source of abnormal noise. Check for any loose or vibrating pipes. Loose pipes can transmit vibrations from the pump to the surrounding environment, amplifying the noise. Secure all the pipes with proper supports and clamps.

Inspect the piping for blockages or restrictions. A blocked pipe can cause the pump to work harder, leading to increased noise. If a blockage is found, clear it immediately. Also, ensure that the piping is properly sized and that the elbows and fittings are installed correctly to minimize pressure losses and turbulence.