Steps to start a centrifugal pump and precautions

Check the lubricating oil and the circulating water. Open the inlet valve to fill the pump; the outlet valve can be opened slightly as well. If the medium is not toxic or harmful, the outlet vent valve can be opened for venting. Rotate the pump, contact the electrical maintenance team to supply power, and contact the operator on site to start the motor. Once the outlet pressure gauge shows normal values, slowly open the outlet valve until it is fully open (in cases where there is a control valve at the outlet, which is common, there are also situations where the valve cannot be opened fully). Check that the pump is operating properly, and that’s it

The startup steps for a centrifugal pump, as well as those for a water pump, are as follows: First, open all the inlet valves of the single-stage centrifugal pump and close the outlet valve. Start the motor; only after the speed reaches normal levels should the outlet valve be gradually opened to adjust it to the desired operating conditions. 　　Correct operation method of water pumps The operation of centrifugal pumps can be divided into three steps, namely startup, operation, and shutdown. 　　Startup: The following preparatory work should be done before starting: (1) Check the condition of the water pump equipment. 　　(2) The bearings are properly filled with oil, the oil level is normal, and the oil quality is satisfactory. (3) Open all the inlet valves of the water pump. 　　(4) Fill the pump with water or use a vacuum pump to draw in water (excluding backflow), then open the vent valve to release air. 　　(5) Check for leaks at the shaft seal; a slight dripping from the packing seal is acceptable. 　　(6) The motor rotates in the correct direction. 　　Once the above preparatory work is completed, the motor can be started. Once its speed is normal, check the pressure and current, and pay attention to any vibrations or noises. Once everything is normal, gradually open the outlet valve and adjust it to the desired operating condition; be careful that the valve should not remain in the idle state for more than 3 minutes. 　　Operation: During operation, routine inspections are carried out, and the inspection covers four aspects: 1. Inspection of bearings (1) The bearing temperature should not exceed 75°C. 　　(2) The bearing chamber must not be flooded with water or contaminants, and the oil must not become emulsified or turn black. 　　(3) When a rolling bearing is lubricated with thin oil, the oil level should not be below the center line of the oil gauge. 　　(4) Are there any abnormal noises? Abnormal sounds usually occur when rolling bearings are damaged. 　　2. Are the readings on the vacuum gauge, pressure gauge, and ammeter normal? (1) The pointer of the vacuum gauge should not swing too much; excessive swinging may cause vaporization at the pump inlet. Additionally, the reading on the vacuum gauge should not be too high, as this could indicate that the inlet valve is blocked or stuck, or that the water level in the suction tank has dropped. 　　(2) If the reading on the outlet pressure gauge is too low, it may be due to severe wear of the sealing ring and guide vane sleeve. The gap between the stator and rotor is too large, or the outlet valve is opened too wide, resulting in high flow rate and low head pressure. 　　(3) If the ammeter reading is too high, it may be due to a high flow rate or friction between the stator and rotor. 　　3. Does the pump unit generate excessive vibration? The reasons for vibration include: (1) Misalignment of the shaft axes of the water pump and the motor. 　　(2) The foot bolts of the pump or motor are loose, or the foundation is not solid. 　　(3) Unbalanced rotor mass. 　　(4) When the pump operates at low flow rates, radial forces, backflow, and cavitation occur. 　　4. Is the sealing functioning properly? 　　(1) A K-type dynamic seal should not leak when it is operating normally. 　　(2) In cases with a cooling water system, check whether the water flow is normal.

Personally, I think the approach suggested above is the right one for hands-on operation; as for the key aspect to pay attention to, it’s ensuring proper lubrication

Startup: The following preparatory work should be done before starting: (1) Check the condition of the water pump equipment. 　　(2) The bearings are properly filled with oil, the oil level is normal, and the oil quality is satisfactory. (3) Open all the inlet valves of the water pump. 　　(4) Fill the pump with water or use a vacuum pump to draw in water (excluding backflow), then open the vent valve to release air. 　　(5) Check for leaks at the shaft seal; a slight dripping from the packing seal is acceptable. 　　(6) The motor rotates in the correct direction. 　　Once the above preparatory work is completed, the motor can be started. Once its speed is normal, check the pressure and current, and pay attention to any vibrations or noises. Once everything is normal, gradually open the outlet valve and adjust it to the desired operating condition; be careful that the valve should not remain in the idle state for more than 3 minutes. This can be found online: lol