I. Operational Procedures for Centrifugal Fans
Pre-operation Inspection
- Check if the bearing is properly lubricated, and there are no foreign objects inside the centrifugal fan.
- Verify the flexibility of all manual and electric dampers.
- Inspect if all bolts are securely fastened.
- Ensure that the bearing cooling water is flowing smoothly.
In-operation Inspection
- Check if the motor operates smoothly without abnormal noise, vibration, temperature, or odors.
- Inspect the bearing temperature, oil level, and cooling water to ensure they are normal.
- Examine whether the fan operates smoothly and without unusual noise or vibration.
- Inspect if there are air leaks in the exhaust duct due to cracks.
- Verify the proper sealing of all access doors.
- Ensure that damper positions match the central control display.
- Check for any loose or missing bolts.
Daily Maintenance
- Examine the wear and tear of fan blades and clean accumulated dust.
- Clean the bearings, inspect lubricating grease and oil, and replenish or replace as necessary.
- Check for debris inside the fan, close access doors, and seal them properly.
- Inspect bolts for any looseness or missing ones, and tighten or replace as needed.
II. Safety Regulations for Centrifugal Fans
Pre-Startup Checks and Preparations
- Inspect whether the motor inlet and control wires are securely fastened.
- Check if all component connecting screws are securely fastened.
- Ensure the bearing oil level (for oil-lubricated bearings) is at the correct level in the sight hole.
- Check if the inlet damper operates smoothly and close it.
- Open the cooling water valve and confirm unobstructed water flow.
- Notify the control room that it is safe to start.
Startup
- Under normal circumstances, start the fan according to the startup sequence from the electrical control room.
- After startup and when the motor reaches normal speed, immediately open the inlet damper and adjust it to the required position (controlled from the control room). Monitor whether the current falls within the specified range.
- Listen for normal sounds from the fan, bearing, and observe bearing vibrations.
- If the initial startup is not successful, identify the cause and rectify it before attempting another startup.
Shutdown
- Under normal circumstances, shut down the system in accordance with the designated shutdown sequence from the electrical control room.
- Ensure that personnel wear proper protective equipment.
- Do not use wet rags or other tools to clean energized equipment. If cleaning is necessary, ensure that power is disconnected.
- Prohibit any unauthorized actions and strictly adhere to equipment safety regulations.
