Pumps Vs Compressors
Pump
1.
2.
3.
4.
5.
6.
A Pump is a device that transfers fluid from one
place to another required place.
The pump is used to transport fluids like water,
oil and so on.
The pump is mostly used to increase the energy
of an incompressible fluid.
The pressure of the fluid may or may not change
in the Pump.
While transferring or sending or moving the
fluid the volume remains constant from inlet or
outlet.
In domestic places the pumps are used at
several places like in the washing machine,
lifting water from the ground to tank, it is also
used in several systems like Areophane, ship and
so on.
Compressor
1.
2.
3.
4.
5.
6.
A compressor is a device that is used for the
storage of squeezed gas and supply whenever
needed.
The compressor is used to transport only gases.
The compressor is mostly used to increase the
energy of the compressible fluid.
The pressure of the fluid must change in the
compressor.
In compressor the inlet and outlet is different
that means the volume does not remain
constant.
The compressor is also used in a domestic place
like filling the air into or motorcycle, car and so
on.
Pump Vs Compressors
•
Can we use Pumps instead of compressors and vice versa ?
Fluid properties
Viscosity
Density
Compressibility
Relation
between P & T
Viscosity
 Which is more viscous ?
 𝜇𝐿𝑖𝑞𝑢𝑖𝑑 ≫ 𝜇𝑔𝑎𝑠
 High gas leakage
•
External Leakage (appear as drip and puddles that collect on plant floors or
equipment)
•
Internal Leakage (Internal leakage includes leaks within the high-pressure
water system. It can be intentional to provide lubrication for various valve
components, unintentional internal leakage can be as problematic as
external leakage.)
Internal leakage
N ≈ 5000 rpm
N ≈ 1500 /3000 rpm
Steam turbine drive
Electric motor drive
Gas turbine drive
External leakage
Carbon ring seal
Click for video
Mechanical seal
Click for video
Oil-lubricated seal
Packing seal
Click for video
Click for video
Dry gas seal
Density
 Which is more denser?
 𝜌𝐿𝑖𝑞𝑢𝑖𝑑 ≫ 𝜌𝑔𝑎𝑠
•
Large gas volume to mass
•
Light gas inertia
Machine size
Machine speed and rigidity
N ≈ 100 rpm
N ≈ 1000 rpm
Compressibility
 Liquids are incompressible
 Gasses are compressible
Stage size
Storage
Large quantities can be stored in small
volumes
• Safety problem (P < 10 bar)
Relation between Pressure and
Temperature
 For liquids
𝑇≠𝑇 𝑃
 For gases
 𝑷𝑉 = 𝑚𝑅𝑻
𝑇∝𝑃
Cooling
Compressed Air production line
Atmospheric air
Dry clean
compressed air
Coarse
filter
Compressed Air preparation
Pressure
switch
Compressor
Safety
valve
Click for video
Air
receiver
Air
cooler
Condensate
drain
Fine filter
Refrigerant
dryer
Desiccant
dryer
Dry clean
compressed air