Commissioning of Slurry pumps

About Slurry pump test run:

The pump-engine unit can be tested right after it is installed and adjusted. Users with conditions should first test run the pump with clean water, and after a while of normal operation, transport mixture of water and solids.

1.1. Start

1) Open the shaft seal water and adjust the pressure to the specified value;

2) Fully open the inlet valve;

3) Open the water injection valve to inject water into the pump. (Backflow pump does not need water injection);

4) Adjust the outlet valve opening to 1/4;

5) Start the pump-engine unit. After the speed is normal, open the outlet pressure gauge. If the pressure is normal and stable, slowly open the outlet valve till it is fully opened or meets the working conditions.

Note: Starting the pump with the outlet valve fully open will cause motor overload; using a small inlet valve to control the flow will cause pump cavitation, both of which should be avoided.

1.2. Operation

After normal operation, the following items should be observed:

Whether the flow rate and head (inlet and outlet pressure) of the pump are stable and meet the process requirements; whether the current is stable; whether the unit has abnormal sounds and whether the noise is too loud; whether the shaft seal leakage is normal (drip seepage);

Mechanical seal size ≤ 50mm, leakage ≤ 3ml/h. Mechanical seal size > 50mm, leakage ≤ 5ml/h. Bearing temperature rise 35°C, the maximum temperature shall not exceed 75°C;

Vibration value should be kept within the specified range.

1.3. Stop the pump

① Before stopping the pump, pump clean water for 30 minutes to clean the medium inside the pump and pipe.

② Close the pump outlet valve.

③ Shut down and close the corresponding shaft seal water and cooling water.

④ Close the pump inlet valve.

Note: It is never allowed to stop the pump when the outlet valve is fully open, otherwise it is easy to form water hammer, causing damage to the pump or pipe fittings.