After the installation of various newly purchased and installed centrifugal pump products, it is necessary to conduct centrifugal pump testing in advance. When conducting centrifugal pump testing, the following centrifugal pump testing methods and precautions should be followed.
1. Before starting the centrifugal pump, it is prohibited to conduct idle and no-load testing. The liquid test should be carried out according to the operating procedures specified in the centrifugal pump operating instructions. For the forced lubrication system, the temperature rise of the centrifugal pump bearing oil should not exceed 28 degrees, and the temperature of the bearing metal should be less than 93 ℃.
2. For centrifugal pumps with oil ring lubrication or splash lubrication systems, the temperature of the lubricating oil should not exceed 39 degrees, and the temperature of the bearing components should be less than 82 degrees.
3. When testing the centrifugal pump, the vibration value of the centrifugal pump bearings should also be checked. The vibration standard of the centrifugal pump bearings can refer to the vibration standards of relevant petrochemical rotating machinery.
4. During the centrifugal pump testing process, the operation of the centrifugal pump should be very balanced and noiseless, the coolant and lubricating oil systems should be normal, and there should be no leakage in the centrifugal pump and its ancillary pipelines.
5. During the process of testing the centrifugal pump, attention should be paid to whether the current of the centrifugal pump motor is operating within the specified range. If the current exceeds the limit, it indicates that the actual working head is lower than the pump head. In this case, it is recommended to close the outlet valve to control the flow rate of the centrifugal pump and use it within the rated current range.
6. Various seals and medium leaks of centrifugal pumps must not exceed the following standard requirements:
(1) Clean water centrifugal pump with mechanical seal: 10 drops/min for light oil and 5 drops/min for heavy oil
(2) Multi stage centrifugal pump product with packing seal: 20 drops/min for light oil and 10 drops/min for heavy oil
(3) For magnetic driven pumps transporting toxic, harmful, flammable, and explosive media, visible leaks are not allowed.