why centrifugal pump is not a positive displacement pump|centrifugal pump vs rotary

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The debate of positive displacement pump vs centrifugal pump often arises when deciding which pump to use for specific applications. Positive Displacement Pumps (PD) and centrifugal pumps are two common types of pumps used in various industries for fluid transfer. While both types of pumps serve the purpose of moving fluids, they operate on different principles and have distinct characteristics that make them suitable for specific applications. In this article, we will delve into the differences between centrifugal pumps and positive displacement pumps, focusing on why centrifugal pump is not a positive displacement pump.

Whilst centrifugal pumps are the most common type of pump installed due to their simplicity, positive displacement pumps are a solution that can handle more difficult conditions where centrifugal pumps may fail, thanks

Difference Between Centrifugal Pump and Positive Displacement

One of the key differences between centrifugal pumps and positive displacement pumps lies in their operating principles. Centrifugal pumps work on the principle of centrifugal force, where a rotating impeller imparts kinetic energy to the fluid, causing it to move radially outward. On the other hand, positive displacement pumps operate by trapping a fixed amount of fluid in a cavity and then displacing it through the pump.

Positive Displacement Pump Disadvantages

While positive displacement pumps are known for their ability to provide a constant flow rate regardless of changes in system pressure, they also come with certain disadvantages. One of the main drawbacks of positive displacement pumps is their sensitivity to viscosity changes. As the viscosity of the fluid being pumped increases, the efficiency of the positive displacement pump decreases, leading to potential issues such as cavitation and pump damage.

Positive Displacement Pump vs Diaphragm

Diaphragm pumps are a type of positive displacement pump that use a flexible diaphragm to displace the fluid. While diaphragm pumps offer advantages such as the ability to handle abrasive and viscous fluids, they also have limitations in terms of flow rate and pressure compared to other types of positive displacement pumps.

Characteristics of Positive Displacement Pump

Positive displacement pumps are known for their ability to provide a constant flow rate, self-priming capabilities, and the ability to handle high viscosity fluids. These pumps are often used in applications where precise flow control is required, such as in chemical processing, food and beverage production, and pharmaceutical manufacturing.

Positive Displacement Pump Working Principle

The working principle of a positive displacement pump involves trapping a specific volume of fluid in a cavity and then displacing it through the pump. This results in a continuous flow of fluid, regardless of changes in system pressure. Positive displacement pumps are often used in applications where accurate dosing and metering of fluids are essential.

Centrifugal Pump vs Submersible

Centrifugal pumps and submersible pumps are both types of centrifugal pumps, with the main difference being that submersible pumps are designed to be submerged in the fluid being pumped. Submersible pumps are commonly used in applications such as wastewater treatment, drainage, and irrigation, where the pump needs to be placed underwater for efficient operation.

Centrifugal Pump vs Rotary

Rotary pumps are a type of positive displacement pump that use rotating mechanisms to displace the fluid. While centrifugal pumps rely on centrifugal force to move the fluid, rotary pumps use rotary motion to create flow. Rotary pumps are often used in applications where high pressure and low flow rates are required, such as in hydraulic systems and lubrication systems.

Positive Displacement Diaphragm Pump

A centrifugal pump that is pumping against a closed valve will just build up to some maximum pressure for that pump, but a positive displacement pump will continue to discharge fluid into …

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why centrifugal pump is not a positive displacement pump|centrifugal pump vs rotary