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Difference between pump and compressor

saurabhjain

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What is the difference between pump and compressor ?

When we use pump and When we use compressor?

pump.thumb.jpg.053c49e291726bd8be51c090f

 

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Nothing. To compress, something has to be squeezed, so to in pumping a compression takes place however water wont compress only the trapped gasses do so.

Not to be confused with the pictured? Neither pump nor compressor but Francis hydro turbine 82% effiient.

Flow data one litre per second at nine bar pressure supply 720 watts electricty. :-)

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Well, a compressor compresses a gas and a pump moves a liquid. Compressors are often used in refrigeration applications where gas is transformed into a liquid, so the main task for the compressor is not to move the gas but to compress it to increase its pressure. But role of pump is for displacement of fluid (mainly liquid) by applying pressure.

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I think the basic difference is that pump is used increase energy of fluids but compressor is used to increase energy of gases alone.
Another difference is that compressor achieves pressure rise by volume change alone while pumps can achieve this by either change in volume or by increasing momentum of fluid.

please correct me if my concepts are wrong.

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In practice there is little actual difference in principle operation....they both form a pumping action in order to move a fluid. The pump is generally optimised for minimum compression maximum flow whereas a compressor optimised for maximum compression....sometimes this effectively means minimum flow. (subject to required delta P).

Indeed, many are completely interchangeable...for example a high-volume air pump can also be used as a compressor as long as its operational constraints are not exceeded..., most pumps can be used as compressors, with the only penalties being significant efficiency drops due to the optimised design....and of course, in the case of displacement units, the risk of catastrophic failure.

It is worth noting though, that liquid fluids are compressible within the strains (no pun intended) of their Bulk Modulus.

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pump is used for liquid or fluid to transform it to a much higher pressure head while compressor is used for gases to transform from low to a much higher pressure. pump can handle both liquids and gases but compressor can handle only the gases due to the incompressible nature of liquids.

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Basically a Pump is used for liquid or fluid to transform it to a much high pressure head while a Compressor is used for gases to transform from low to a much high pressure.

From Mechanical Engineering point of view liquid is incompressible so Compressor cannot be used for liquid substances.

Posted by AbdulQadir Abba Sheriff on linkedin

Mr. Abdul Qadir

In case of Hermetic Type Compressor liquified gas is made to pump if at all there is leakage of liquid gas then compressor compressors servo oils

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Basically a Pump is used for liquid or fluid to transform it to a much high pressure head while a Compressor is used for gases to transform from low to a much high pressure.

From Mechanical Engineering point of view liquid is incompressible so Compressor cannot be used for liquid substances.

Posted by AbdulQadir Abba Sheriff on linkedin

That is correct, Liquid is transformed to a higher head through a pump and a compressor transform gasses to a higher pressure.

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Air compressor is a system that squeezes air amount. When used in an business feeling, they are used to work several different kinds of methods, equipment, and gas equipment. While you can effortlessly use oil centered equipment to energy most of the equipment and other items discovered at a job website, doing so with business air converters is quicker, more successful, and far less expensive than it would be if you went with the other alternative.

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S.K.Das Gupta-Basicallly pumps and compressors perform similar work.Both deliver flow with pressure.If the delivery side of the pumps and compressors kept opened without any reduction in pipe opening,we don't get higher pressure on the delivery side of the machine.A compressor is capable of delivering fluid of rated volume at rated pressure.In case of centrifugal pumps (single stage),if the delivery port is blocked or partially opened,the delivery pressure will rise slightly with reduced flow causing no damage to the equipment but in case of compressor(Positive displacement pumps,reciprocating and screw compressors),serious damage may be caused to the machine if other safety system do not work.

In short,both pumps and compressors deliver rated amount of flow..Pumps (Single stage) deliver at a lower pressure compared to compressors.We should not get confused with the terms as in some countries.oil pump is called an oil compressor.Also,since oil/water are incompressible,we term the machines handling these liquids as pumps.similarly,gases,air are compressible,we term these machines as compressor but there is no specific boundary line in between the two.

 

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The primary purpose of compressor is to create pressure to transform the physical properties of a fluid, e.g. compressor in a chiller is to compress refrigerant vapour to higher pressure so the condensation temperature is lowered, gas is compressed for storage etc. The primary purpose of pump is to create flow, to transport fluid from point A to point B.

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Basically a pump and compressor are mechanically the same device, only their design parameters vary according to the fluid they transport. A pump is used to transfer incompressible fluids from a low head to a high head by providing external work. A compressor also does the same but while increasing the fluid pressure, it also increases its density since the fluid transported by a compressor is generally a compressible (density changes with change in other properties) fluid like air or a refrigerant, but one cannot truly distinguish by having a mere look at the construction of these devices as they are built and function similarly, for e.g we have centrifugal pumps as well as compressors (turbocharger), reciprocating pumps as well as compressors, axial pumps as well as compressors. Also to confirm that they are basically the same devices, one can simply expose the suction port of a household centrifugal pump to the environment, then just put their hand near the discharge port, there will be an airflow similar to but not as intense as a blower.

One cannot merely say that a pump is just used to create a flow of fluid i.e transport fluid. Hydraulic systems use positive displacement pumps to pressurize fluid as well. Also a blower is a type of centrifugal compressor used for creating flow of fluid, so one also cannot classify compressors merely as a pressurizing device in general.

 

Edited by Ashwin Shridhar

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