MARINEENGINEERINGKNOWLEDGE – Page 4

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

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Advantages and Disadvantage of Various pumps: Gear, Vane, Positive displacement

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