Centrifugal pump did not start before the pump, into the air, the liquid dissatisfied with a large number of media or vaporization, then the centrifugal pump outlet pressure dropped sharply and intense fluctuations, a phenomenon known as taking the time. Performance performance is the outlet pressure tends to zero or close to the pump inlet pressure. Pump contact parts and mechanical seals friction pair due to dry or semi-dry friction and wear failure. Avoid the following measures: First, the mechanical aspects of the main mechanical seal is to do a good job, it is forbidden to make the air from the pipeline and pump into the medium. In the repair of the moving, static seal strict inspection, to prevent leakage caused by equipment. Second, the process aspects of the process to stabilize the process operation, the car will drain the gas line, once the gas, to quickly return to the tower, the temperature in the process should take lower limit, the pressure should be capped, the bottom liquid The surface should not be too low, the pump flow should be moderate, minimize pressure and temperature changes. The reserve pump inlet valve, which is negative pressure to the inlet pressure, should be closed.
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