When selecting a feed pump for a filter press, there are several key considerations

When selecting a feed pump for a filter press, there are several key considerations:

1. Flow Rate: Determine the required flow rate based on the size and specifications of the filter press. Generally, the flow rate is calculated as the size of the filter press (in square meters) multiplied by 0.45.

2. Head: The head of the feed pump is determined by the inlet pressure of the filter press. For every 0.1 MPa of inlet pressure, add 10 meters of head. Additionally, consider the pressure loss in the piping between the pump outlet and the filter press inlet.

3. Impeller Type: There are two types of impellers commonly used in feed pumps for filter presses – double suction impellers and single suction impellers. Double suction impellers have the secondary impeller at the front and the primary impeller at the back, resulting in lower pressure and reduced leakage in the shaft seal. Typically, a packing seal is sufficient for sealing, but mechanical seals can also be used.

4. Automatic Start-stop Device: Since the feed pump requirements vary during different stages of filter press operation, it is advisable to install an automatic start-stop device. This helps prevent excessive stress on the pump shaft, especially when the filter press is full and the flow rate is zero.

There are specialized feed pumps available for filter presses with double suction impellers, as well as high-head slurry pumps from the ZJ series that can be used.