Maintenance Procedures for Stainless Steel Multistage Centrifugal Pumps
Stainless steel multistage centrifugal pumps are among the most commonly used pump series on the market, with a vast installed base. Due to their widespread use, various operational issues can arise. Today, pump our engineering team will explain the maintenance and operational procedures for these pumps.
First:
1. Check the motor's direction of rotation; viewing the pump from the motor end, the pump should rotate counter-clockwise. Note: Keep the test run brief to avoid dry friction damage to the mechanical seal.
2. Open the vent valve to allow liquid to enter; close the valve once the pump is fully primed.
3. Inspect the horizontal multistage centrifugal pump for any abnormalities.
4. Lubricate the faces of the mechanical seal with lubricating fluid.
5. For high-temperature horizontal multistage centrifugal pumps, preheating is required; the temperature rise rate should be 50°C per hour.
Next:
1. Open the suction valve and close the discharge valve.
2. Start the motor and observe the pump's operation to ensure it is running correctly.
3. Adjust the discharge valve opening based on the required operating conditions; ensure the motor operates within its rated current to prevent pump overload and motor burnout.
4. Check the shaft seal for leakage; under normal conditions, mechanical seal leakage should be less than 3 drops per minute.
5. Check the motor; the bearing temperature should remain below 70°C.
Finally:
1. For high-temperature multistage pumps, cool the unit down first at a rate of less than 10°C per minute until the temperature drops below 80°C.
2. Close the discharge valve.
3. Stop the motor.
4. Close the suction valve.
5. If the pump is to remain idle for an extended period, drain all liquid from the pump.
We hope you have gained valuable insights from the information above regarding the maintenance of stainless steel multistage centrifugal pumps.