Advantages and Disadvantages of Positive Displacement
Pumps
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Advantages
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Disadvantages
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PD
pump has a low operating cost.
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These
are less efficient pumps than
dynamic pumps.
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These
have a low initial cost.
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Low
efficiency.
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They
are best appropriate for high viscosity fluids.
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These
can’t deliver pulsating free flow.
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It
has a high-pressure ratio for small sizes.
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These
are not best for high-pressure applications.
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These
pumps don’t have priming issues.
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They
generate high noise.
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These
don’t have cavitation problems.
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Low
discharge capability.
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Advantages and Disadvantages of Rotary Vane Pumps
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Advantages
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Disadvantages
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It
has low noise.
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These
pumps have low efficiency of up to 30%.
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It
generates low vibration.
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The
Vane pump requires pressure relief valves to prevent the pump from the sudden
closure of output supply.
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These
pumps are fully oil-free.
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These
are best for abrasive fluids.
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Rotary
vane pumps have very easy maintenance.
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This
pump needs a good seal to avoid leakage.
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The
vanes of this positive displacement pump have a long life cycle.
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Foreign
media may cause the failure of the pump.
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They
provide pulsation-free fluid flow.
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These
need a good filtration system.
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Advantages and Disadvantages of Rotary Gear Pumps
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Advantages
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Disadvantages
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A gear pump has a very simple and
compact design.
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It is best suitable for abrasive fluids due to the
meshing
of gears.
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It has a low maintenance cost.
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These have high noise.
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It can handle high viscous fluids.
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It can’t use for large bulk flow due to the
limited pump
size.
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These pumps use to produce high pressure such as 3000psi
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It has less efficiency than a centrifugal pump.
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These can work in both directions.
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It has unadjusted displacement.
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Advantages and Disadvantages of
Screw Pump:
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Advantages
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Disadvantages
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These
are highly efficient pumps because of the internal compression.
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It
needs a gas ballast to pump the light gases.
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It
has high robustness.
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Less
efficient than the centrifugal pump.
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It
has high tolerance against contamination and fluid vapors
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It
can’t scale down for small pumping speeds applications.
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These
pumps have a high pumping speed.
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It
has a high initial installation cost.
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