Since most chemical raw materials are corrosive, the pumps used to handle them must be constructed from corrosion-resistant materials. Consequently, stainless steel corrosion-resistant pumps are currently the most common type on the market. Given the high cost of materials required for this corrosion resistance, it is crucial to prevent human-induced damage; therefore, adhering to proper operating guidelines is essential. Some users overlook these details, finding them cumbersome, and operate the units like standard water pumps to save time. This often leads to a shortened service life, pump body damage, or material corrosion. Today, as a manufacturer of stainless steel corrosion-resistant pumps, Shanghai Shenyin Pump Manufacturing Co., Ltd. would like to share some important usage guidelines. in your work and daily operations.
I. Pre-start Preparation:
1. Verify the correct motor rotation direction (clockwise when viewed from the top of the motor); keep the test run brief to avoid dry friction damage to the mechanical seal.
2. Open the vent valve to allow liquid to fill the entire pump casing, then close the valve once full.
3. Inspect all components to ensure they are in normal condition.
4. Manually rotate the shaft to allow lubricating liquid to reach the mechanical seal faces.
5. For high-temperature models, perform a pre-heating run, increasing the temperature at a rate of 50°C per hour to ensure uniform thermal expansion.
II. Starting the Pump:
1. Fully open the inlet valve.
2. Close the discharge line valve.
3. Start the motor and observe the pump's operation to ensure it is functioning correctly.
4. Adjust the discharge valve opening to meet the required operating conditions. If the pump is equipped with a flow meter or pressure gauge at the outlet, adjust the valve so the pump operates at the rated point specified in the performance data sheet. If no flow meter or pressure gauge is installed, adjust the valve while monitoring the motor current to ensure it remains within the rated range; otherwise, the pump may become overloaded (drawing excessive current, which can burn out the motor). The final degree of valve opening depends on the specific pipeline operating conditions. 5. Check the shaft seal for leakage; under normal conditions, leakage from the mechanical seal should be less than 3 drops per minute.
6. Check the chemical pump motor and bearings; the temperature rise should be ≤70°C.
III. Shutdown:
1. For high-temperature models, lower the temperature first at a rate of ≤10°C/min; the pump may only be shut down once the temperature drops to ≤80°C.
3. Stop the motor.
4. Close the inlet and outlet valves.
5. If the pump is to be shut down for an extended period, drain all liquid from the pump.
Precautions for using stainless steel corrosion-resistant pumps
We hope this proves helpful to you.