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Five key points for using vertical pipe centrifugal pumps: 1. Commissioning: Check whether the connections are loose； Manually rotate the coupling to turn the rotor several times, and check whether the unit rotates smoothly, whether there are any noises or unevenities in its operation, in order to determine if there are any foreign objects inside the pump or if the shaft is bent, as well as whether the seals are installed properly ； Check whether the clean No. 20 lubricating oil has been filled to occupy 1/2 of the space inside the sealing chamber ； Is the surface of the pump unit clean? ； The unit is switched to no-load testing. 2. Manual start: Fill the pump (for the first time), slightly open the outlet valve, start the motor; once the pressure rises and it is confirmed that the centrifugal pump set is operating smoothly, gradually open the outlet valve to the value required for normal operation. 3. Operational inspection: When the pump is operating normally at the power frequency (or variable frequency), it is necessary to regularly check and record the readings of instruments such as the ammeter, voltmeter, inlet and outlet vacuum gauges, pressure gauges, and flow meters associated with the pump unit. Are the vibration, noise, temperature rise, etc. of the unit normal? There should be no obvious leakage of aviation fuel at the shaft seal. 4. Normal shutdown: Close the discharge valve to reduce the load on the pump and stop the motor. 5. Emergency shutdown conditions: a. Abnormal reading on the pump motor current meter (excessively high or very low) ； The pump system is making abnormal noises. b. The vacuum pressure gauge at the pump inlet and the outlet pressure gauge show abnormal readings; the pump body vibrates heavily and emits unusual noises, with its performance severely degraded. c. The pump motor emits an unpleasant odor, aviation fuel leaks from the shaft seal, and the bearing temperature exceeds 75°C, among other issues.