【Daily Question】Theoretical Foundation 2019.11.19
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Fill-in-the-blank: Before starting a centrifugal pump, it must be primed; otherwise, ( ) will occur； The installation height of the centrifugal pump should be less than (greater than, less than, equal to) the allowable installation height; otherwise, ( ) will occur. Answer: Gas entrapment, cavitation. Hint: An additional reward will be given to those who can explain the problem-solving process; the answer can be found in the response!
Air entrapment and cavitation: If the pump is not filled with fluid before starting, non-condensable gases (such as air) remain inside the pump, which can lead to air entrapment during operation； If the installation height is higher than the allowable level, cavitation is likely to occur even if the pump is primed before startup, as the liquid being transported vaporizes.