High viscosity Pumps

AxFlow supply a range of Pumps for high viscosity fluids. Our high viscosity pump range includes AODD, Eccentric disc, centrifugal and many more.

The definition of viscosity changes from industry to industry, the viscosity of individual liquids generally changes with temperature. Viscosity is the property of a given liquid that describes its resistance to flow. A highly viscous fluid tends to be thick, like honey or cold maple syrup. Compared to a relatively nonviscous fluid, such as water, highly viscous liquids flow much more slowly. Of course, when you add energy, in the form of heat, the molecules making up these liquids become less densely packed and are better able to slide past one another. Thus, honey becomes much less viscous when it’s hot than when it’s cold.

Here are the typical maximum viscosties of most common pump types.

As the density and thickness of a fluid increases, it becomes increasingly difficult to flow and pump with a centrifugal pump. Typically the thicker the fluid a different technology is required being positive displacement pumps, as with a centrifugal pump the thicker the fluid is the more it recirculates within the pump head.

Pumps which handle high viscosity fluids typically have larger inlets, run slower, and are consequently more efficient with such fluids than a centrifugal pump. Pumping high viscosity liquids require careful handling to prevent changes to its consistency, ensure parts of the liquid do not separate out and that solids remain in suspension.

The secret to handling viscose fluids sucessfully is a wide range of pump types something that AxFlow has in abundance.These are supported by our UK and international expertise and ability to measure fluid viscosities with our rheometer.

We are also able to supply systems that incorporate mechanical pump feeders and bridge breakers.

Why is viscosity an important factor when selecting a pump

Viscosity is an highly important factor to consider when selecting a pump because it directly affects the pump's ability to efficiently transport liquids or fluids.

• Viscosity Variation with Temperature: Viscosity changes with temperature, affecting the fluid's flow properties. Effective pumping solutions must accommodate variations, ensuring consistent performance across different temperature ranges.

• Resistance to Flow: Highly viscous fluids resist flow, making it challenging to pump them efficiently. As viscosity increases, traditional centrifugal pumps become less effective, necessitating alternative technologies for successful pumping.

• Preventing Separation and Suspension Issues: Certain viscous fluids contain solids or particles. Careful handling is vital to prevent separation, ensuring uniform consistency and suspension of solids within the liquid.

• Cavitation Risk: High-viscosity fluids can increase the risk of cavitation, which occurs when the pressure in the pump drops to a level where the fluid vaporizes and forms cavities or bubbles.

• Maintenance and Longevity: The viscosity of the fluid can also impact the wear and tear on pump components. High-viscosity fluids may cause more significant wear on impellers, seals, and bearings, potentially leading to increased maintenance requirements and shorter pump lifespan.

Examples of Highly Viscous Fluids

• Molasses: A thick, syrupy liquid extracted from sugar cane or sugar beet.
• Molten Chocolate: Chocolate in its liquid state is highly viscous, requiring careful handling during industrial processes.
• Polymer Melts: Molten polymers used in manufacturing processes often have high viscosity.
• Adhesives and Sealants: Viscous adhesives and sealants used in construction and manufacturing applications.
• Lubricating Grease: Thick, viscous lubricants used in automotive and industrial machinery.

Pumps which handle high viscosity typically have larger inlets, run slower, and are consequently more efficient with such fluids than a centrifugal pump. Some high viscosity liquids require careful handling to prevent changes to its consistency, ensure parts of the liquid do not separate out and that solids remain in suspension.

Successful handling of highly viscous fluids involves understanding viscosity changes, selecting appropriate pump types, and implementing precise operational techniques. With a wide array of pump technologies and expertise, AxFlow ensures efficient and reliable solutions for pumping challenges posed by viscous substances, ensuring consistency and quality across various industrial applications.