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Precautions for centrifugal pump commissioning


All newly purchased and installed centrifugal pump products need to be tested in advance after installation. The following centrifugal pump testing methods and precautions should be followed when testing centrifugal pumps
1. Before starting the centrifugal pump, it is forbidden to run the pump with no load and no load. The liquid test shall be carried out according to the operating procedures specified in the operating instructions of the centrifugal pump. For the forced lubrication system, the temperature rise of the bearing oil of the centrifugal pump shall not exceed 28 ℃, and the temperature of the bearing metal shall be less than 93 ℃.
2. For centrifugal pump of oil ring lubrication or splash lubrication system, the temperature of lubricating oil shall not exceed 39 ℃, and the temperature of bearing parts shall be less than 82 ℃.
3. When testing the centrifugal pump, the vibration value of the bearing of the centrifugal pump should also be checked. The vibration standard of the bearing of the centrifugal pump can refer to the vibration standard of the relevant petrochemical rotating machinery.
4. During the test run of centrifugal pump, the operation of centrifugal pump shall be very balanced and noiseless, the coolant and lubricating oil system shall be normal, and the centrifugal pump and auxiliary pipeline shall be free of leakage.
5. During the test run of the centrifugal pump, attention should be paid to whether the current of the motor of the centrifugal pump operates within the specified range. If the current exceeds the specified range, it means that the head under the actual working condition is lower than the pump head. At this time, it is recommended to turn down the outlet valve to control the flow of the centrifugal pump so that its current can be used within the rated current range.
6. Various seals and medium leakage of centrifugal pump shall not exceed the following standard requirements:
(1) Clean water centrifugal pump with mechanical seal: light oil 10 drops/min, heavy oil 5 drops/min
(2) Multi stage centrifugal pump products with packing seal: light oil 20 drops/min, heavy oil 10 drops/min
(3) For the magnetic drive pump to transport toxic, harmful, flammable and explosive media, no visible leakage is allowed.