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Mechanical Engineering

cryon

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  1. If you are asking why a centrifugal pump does not continue operation while there is some "air" inside the liquid, this is not necessarily "air" but can be other dissolved gases within the liquid that liberate as bubbles when the pressure is less than NPSH (Net Positive Suction Head) of the pump. These are dangerous since when the bubbles travel to high pressure side, they implode by pressure which creates hot fluid jets which heat the pump metal and create pits. More important then this, the trouble in unstable characteristic of the fluid - mainly liquid but including some gas bubbles - the compressor vibration increase which causes alarm and trip. Therefore, you have to be sure that no gas bubbles form at suction of the pump if you wish stable operation of the pump and extended life of it.
  2. Welcome to the forums cryon :)

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