What is a twin screw pump?

A twin screw pump is a positive displacement pump that uses two screws to move fluids or sludge through a chamber. The intermeshing of the two rotors form volumetric chambers, and these chambers fill with fluid that is carried from the suction side to the higher-pressure discharge side of the pump. This type of pump is often used in viscous applications or when high pressures are required. Let’s take a closer look at how the pump work and its potential applications.

1. How do twin screw pumps work?

2. What are the potential applications for this pump?

3. Why are twin screw pumps becoming more popular?

4. How can you benefit from using a twin screw pump?

5. How to choose the right twin screw pump for your needs?

6. How to properly maintain your twin screw pump?

7. Tips for using a twin screw pump


1. How do twin screw pumps work?

Twin screw pumps are positive displacement pumps device that uses a pair of screws, the screws mesh to provide fuel or fluid transfer. The pump inlet and outlet ports are used for the fluid intake and delivery process. The rotors, which act like screws, create voids between the surrounding spaces as they rotate in the same direction within the pump housing. At the area of overlap of the rotating screw profiles, the suction pressure is created drawing fluid or fuel into these voids. As the rotor of the pump rotates, it operates in an intersection zone where they pass each other, these voids decrease pushing fluid along from this area toward the discharge end. This type of pumping system is self-priming and efficient as they can start with practically no flow speed, providing constant and progressive flow rates with low pulsation characteristics, assuring precise delivery of fluids at consistent pressure values with minimal shear on particles suspended in any mediums being conveyed by them.


2. What are the potential applications for twin screw pumps

Twin screw pumps provide an innovative solution for many challenging applications. These positive displacement pumps have a large range of potential uses, such as industrial process circulation, wide-range viscous material metering and transferring, fuel oil handling, high discharge pressure operations, and multiphase pumping.

Their ability to pump suspended and abrasive solids without clogging or losing efficiency makes them ideal for applications such as lubrication systems, printed circuit board production, fuel injection, paper mills, filter aid transport, asphalt and bitumen operations, food production (sugar, honey, etc), personal care industries and wastewater treatment.

Two screw pumps are highly efficient and can deliver precise volumetric flow without cavitation or pulsation, making them ideal for shear-sensitive flows that require reliable performance. They have superior suction performance and offer superior handling of low or variable-viscosity materials with no damage to the pump’s gears. As well as being great for pumping fluids with suspended solids, their design also makes them suitable for packing extreme temperatures that can reach up to 450℃ and differential pressure (1~80 bar) with proper coatings, pump casing, and mechanical seals.

Additionally, their construction from corrosion-resistant materials makes them well-suited for pumping corrosive compounds.

With all these diverse capabilities twin screw pumps have become an extremely versatile option for numerous industries requiring durable yet powerful and efficient pumping solutions including chemical processing, distributed generation systems, hygienic applications; beverage manufacturing, and more.


3. Why are twin screw pumps becoming more popular


In recent years, double screw pumps have become increasingly popular in a variety of industrial applications due to their significant advantages compared to other pump designs.


They offer a prominent performance in demanding applications across various industries.


Their simple design, long service life, and easy adaptability to various fluids make them a reliable choice for many operations. Their ability to effectively handle higher pressures and our wide range of viscosities gives them an edge over traditional centrifugal pumps. They have a great advantage in transferring high viscous media which makes them popular in such as the petrochemical industry, personal care industry, and food industry (stainless steel type). And when transferring low-viscosity fluids, It also has the outstanding advantages of stable conveying, no stirring, and no pulsation.

The positive displacement design results in consistent volumetric efficiency for the duration of service life without energy losses or pulsations that are typically found with centrifugal pumps.

Furthermore, they require less maintenance and make future repairs easier due to a sanitary design that is constructed of fewer moving parts. With a greater understanding of twin screw pump technology comes their increased popularity as the preferred pump choice for many applications.


Twin screw pump — a great solution for businesses seeking an economical and efficient method for moving liquids.


4. How can you benefit from using twin screw pumps

Twin screw pumps are a great resource to make processes more efficient. These pumps are designed for low-flow, also fit for low inlet pressure, and high-pressure applications and can be used with lubricants and non-lubricating fluids.


What is more, a two-screw pump has high performance for high viscous material handling.


This type of pump offers a number of advantages over other types of pumps, making them the ideal choice in many applications. Due to their high volumetric and high-pressure capability, twin screw pumps can reduce the total power consumption and energy costs by up to 20%.


Furthermore, since they are non-pulsating and lubricated, they create an even fluid flow without any vibrations or agitation which helps to protect surrounding equipment from high shear stresses or cavitation, reducing the cost of ownership, and also making them ideal for use when transporting sensitive or abrasive materials such as edible oils or creams. With this pump, there is also less chance of clogging which results in minimal maintenance and downtime.

Overall these features make twin screw pumps an effective and efficient solution that offers great value for any operation.  By using this pump in your industrial system, you can reduce operational costs and minimizes maintenance costs while benefiting from increased reliability and performance.


Dalian Baosteel Metallurgy manufactured and only manufactured twin screw pumps in the pump field for many years, and we achieved many patent technology in this field. For example, our double-suction twin-screw type pump has been carefully built by our R&D personnel and has realized effective measures such as easy seal replacement and quick adjustment of helical surface clearance. The spiral curved surface with independent intellectual property rights developed by our company is at the domestic leading level. Besides, our pump has the ability to reverse flow: it can work in both directions. Last but not least, our products have great advantages in high viscous material transfer, Medium conveying viscosity: ≤ 5000000mm2/s (the higher the viscosity, the higher the efficiency of pumping, the more energy-saving and efficient)


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Our twin screw type pump has superior suction performance with excellent lift capability and low NPSHr provides installation flexibility and increases product recovery. The optimized gearbox design (minimizing noise emissions), mechanical seal, oil chamber design (minimizing gearbox running temperature and increasing bearing life), and other self-setting designs make our pump hydraulically balanced, offer process flexibility, and excellent hydraulic performance. Balanced loading of the shaft assembly reduces vibration and provides quiet pump operation increasing component life and reliability.

If you have issues with Net Positive Suction Head (NPSH), entrained air in your product(process fluids like beer), pump high viscous material (honey, chocolate) or with large solids, or are concerned about line pulsation, then a twin screw pump may be a product worth considering.

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5. How to choose the right two screw-type pumps for your needs?

When choosing the pump for your needs, there are several factors to consider. In general, the size and power of a pump should be chosen based on the pumped fluid, the desired flow rate, and pressure, as well as the application ( hygienic design, FDA-conforming materials, mechanical seals, etc). Additionally, you should think about the performance of the pump in relation to demands such as suction head and shear sensitivity. The ideal pump should not only perform consistently over its lifetime but also be easy to maintain and handle any overloads. Finally, it is crucial to factor in other associated costs such as installation fees or energy consumption while making a decision on whether external control systems are needed or if reliability standards must be met. By taking all these points into consideration when choosing a two-screw pump, you will find one that is perfectly suited for your specific needs.


6. How to properly maintain your twin screw pump

Maintaining the pump is a simple process that can be used to extend the longevity and efficiency of your pump. Regularly inspecting your pump for any wear or damage will help reduce the risk of unplanned downtime. Additionally, keep your pump lubricated at all times, particularly if you are using it with materials that are abrasive. Always remember to consult with your manufacturer’s instructions when cleaning and replacing parts; in some cases, specialized tools may be necessary to complete maintenance safely and effectively. Finally, don’t forget to test and observe your pump regularly; this will ensure ongoing performance and quality assurance.


7. Tips for using a twin screw pump

7.1 When using a pump, it’s important to ensure that the product you’re pumping is compatible with the materials of construction used in the pump.

7.2 Cleaning in place. Proper clearances should be set to achieve optimal performance from the pump.

7.3 To reduce wear on the outer casing and internals of the pump, maintain a consistent flow and ensure that any changes upstream or downstream throughout its operating cycle do not increase or decrease head pressure or cause any unusual torque loads on the rotating components.

7.4 Operating your pump at its intended design rate and following operating principle helps keep wear and tear down and increase process uptime.


With careful attention to these maintenance tips and operation guidelines, your pump will have many successful years of operation and you can also cut the operating costs.



If you’re looking for a reliable and efficient pump for your industrial or commercial application, a twin screw pump may be the right fit. These pumps are increasingly becoming more popular due to their many benefits, including being able to handle viscous liquids without clogging. We can help you select and implement the ideal twin screw pump for your needs. Contact us today to get started with using this type of pump in your business.


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