【Mechanical Equipment Technology Exchange Edition】Mechanical Equipment【Daily Question】20201231
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One of the reasons for pump cavitation is (C). A. The outlet valve of the pump is closed. B. The inlet pressure is too high. C. There is air in the suction pipe. D. The coupling is not properly aligned. Please respond to the daily question in the rotating equipment section within three days.:victory: Points ranging from 5 to 15 will be awarded for correct answers; those who provide detailed explanations will receive additional rewards, while those who get it wrong will still get encouraging points. All forum members are welcome to participate actively and help promote the development of the forum! ! !
The evacuation of pump C refers to the situation where the suction line is not filled with liquid; this can be caused by a low liquid level in the suction area or by leaks in the suction line. Closing the outlet valve affects the outlet flow rate; when the pump starts, the centrifugal pump has its outlet valve closed or slightly open, in order to reduce the starting current of the motor and protect it ； A high inlet pressure helps to fill the pump inlet pipe with liquid ； The consequence of poor coupling alignment is increased pump vibration and higher relative energy consumption; it has little effect on the inlet flow rate, nor does it cause the inlet pipeline to become empty