Standard operating procedures for vacuum units

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I. Pre-startup inspections and preparations 1. The operator should inspect the pump and motor before starting up, to ensure that all the fastening bolts for the pump, motor, and base are present and properly tightened. The vacuum gauge should be accurate and have markings indicating regular inspection. Check whether the lubricating oil in the needle valve oil cup and the crankcase is at the specified level. 2. The pump and motor should have a clean appearance, with all safety guards in place. 3. Open the cooling water inlet valve, and monitor to ensure that there is a sufficient flow of water at the outlet. II. Starting and Operation 1. After starting the motor, check that the rotation direction is counterclockwise when viewed from the pulley side (this applies only during initial installation and during testing after cable replacement). Does the motor make any unusual noises, and is it hot? It rotates smoothly without any noise. 2. There should be no leaks at any connection points. 3. The bearing temperature should not exceed 70°C. III. Parking 1. Close the pump inlet valve and cut off the power supply when parking. 2. Close the needle valve of the oil cup, and after stopping the machine for ten minutes, close the cooling water inlet valve. 3. When the room temperature drops below 0°C, the cooling water must be completely drained to prevent the cylinders and water pipes from cracking due to freezing. IV. Maintenance 1. Check whether the cooling water flow is unobstructed, and look for any leaks in the pump body and pump cover. 2. Regularly check the quality and level of the lubricating oil; replace it and top it up promptly if deterioration or low levels are detected. 3. Regularly check whether the temperatures of various parts are normal. 4. Regularly check whether the fasteners in various parts are loose and whether there are any abnormal noises from the pump body. 5. Check regularly whether the instrument readings are normal. 6. When parking, first close the valve of the vacuum system, then turn off the power supply, and finally close the cooling water valve. 7. In winter, the cooling water inside the pump must be drained after parking.