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parsottam

can pump run with AIR/Gas

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A centrifugal pump can tolerate some cavitation.

Centrifugal compressors can pressurize air but a very low pressure centrifugal "air pump" is called a blower and if often found in heating, ventilation and air conditioning systems. 

Using an impeller which was designed to move liquids would be very inefficient when moving a gas. 

Edited by HydraBob
misunderstood question

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Why do you want to waste power by using a centrifugal pump(Fluid) having more expensive construction and higher power requirement rather than using a less expensive machine requiring much less power centrifugal blower?

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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.

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The density of gases is insufficient for centrifugal forces to be developed at the rotational speed of a conventional pump.  A bladed compressor is similar in principle to an axial pump but designed for gases,

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There is a slightly different question: Can air be used to pump, e.g. lift and transfer a liquid/water? The answer: Yes. I have been working on a project that uses the principles of fluid dynamics to create pumping actions and successfully proved that the functions of a pump can be created using compressed air (or gas). I have made a 3D printed 2-piece unit that can be used as a submersible pump or a borehole pump - WITHOUT ANY MOVING PARTS

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If you use a centrifugal pump to blow air or gas it will be a very inefficient way of blowing air or gas. You will have very low output because the impeller designed in centrifugal pump are to deliver liquid and the rpm is also different in case of PUMP. But if you use compressor then you can develop necessary pressure for your requirement. Otherwise you may use centrifugal blower according to your requirements.

 

thanks  

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