The difference between centrifugal pump and screw pump:

Centrifugal pumps with impeller designs are ideal for high-transfer applications and water-like fluids that require a variable flow rate to be pumped through a network of pipes. Through their engineering principles, it is easy to understand why so many operators rely on centrifugal pumps in a variety of common fluid handling applications. However, we all know that different pumps are usually better suited for different jobs.

Screw pumps are becoming increasingly popular in industries where standard centrifugal pumps do not provide the required flow and energy efficiency, or where they have difficulty handling high-viscosity liquids and other materials that tend to affect performance.

Twin-screw and three-screw pumps have a positive displacement design and have proven to be more versatile and reliable in certain applications - particularly in industries such as chemical processing, petrochemicals, and oil and gas, where viscosity is often an issue for centrifugal pumps.

Disadvantages of centrifugal pump:

Because of familiarity, operators often rely on centrifugal pumps. These were the pumps they were used to, and they found ways to adapt them to different performance requirements. They know how centrifugal pumps work and have adapted their processes to pump what they need to pump. We often see oil processing plants mixing or heating crude oil to reduce viscosity before it passes through a centrifugal pump system. This is a common practice, but it can be an unnecessary step. What if you could eliminate the heating or mixing phase by simply installing a pump system that better handles the viscous stock solution?

In fact, centrifugal pumps rarely operate at their optimum efficiency point (BEP) because they are adapting, tuning, and being used for applications for which they may not be suitable. At the same time, screw pumps can provide the required performance for high-viscosity fluid transfer without having to make these other sacrifices.

Advantages of screw pump:

A screw pump contains multiple screws that mesh with each other as they rotate to form a sealed chamber inside the pump housing. As the screw drive rotates, the fluid moves steadily and continuously through the pump. It produces a volume consistent flow rate that is not affected by pumping pressure or viscosity, which may reduce the speed of the centrifugal pump.

Some of the advantages of screw pumps include:

• Versatility with different flow rates, pressures, liquid types and viscosities

• Constant flow rate

• High volume efficiency

• Controllable output

• Low internal speed

• High tolerance to entrained gases or air

• Smooth and quiet operation

• Very low pulsation

• Self-priming characteristics

• Reduce mechanical vibration

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