Ever wonder how factories efficiently mix large volumes of liquid inside a tank. It is not the same as household mixing. This is why we use an Alfa Laval agitator. Alfa Laval tank agitators are designed to optimize mixing and blending in hygienic and industrial processes, supporting consistent quality, stable product performance and efficient production across dairy, food, beverage, brewing, personal care, biotechnology and pharmaceuticals. Choosing the right agitators types, including agitator type ALT, agitator type ALTB, agitator type ALS and agitator type ALB, helps you match the mixing duty to your tank design, hygiene requirements and product characteristics.
What is a Tank Agitator?
A tank agitator is a mixing device installed on a tank to create controlled fluid movement, helping blend liquids, disperse powders, keep particles suspended and distribute heat evenly. Alfa Laval agitators can be installed in pressurised and non pressurised tanks and they can support sterile or aseptic applications when required. Their modular design allows configuration based on duty, hygienic finish, tank geometry and process conditions. The key advantage is strong mixing performance with low energy input, helping reduce operating cost while maintaining product quality.
How does an Alfa Laval agitator work. An electric motor drives the agitator shaft either directly or through a gearbox. As the shaft rotates, the impeller generates strong circulation with low shear, improving fluid movement throughout the tank. This supports effective blending, suspension and uniformity while helping protect product quality for shear sensitive applications.
Types of Alfa Laval Agitators, ALT, ALTB, ALS, ALB
Best for: Low shear mixing for products that need gentle handling
Agitator type ALT is a top mounted Alfa Laval agitator designed for hygienic, energy efficient mixing in both atmospheric and pressurised tanks.
The Alfa Laval ALT uses a free hanging shaft and a modular system to support a wide range of tank sizes and duties. With EnSaFoil impellers, it delivers gentle product handling, low shear mixing and strong circulation with low power demand. The design supports clean in place (CIP) and is suitable for hygienic applications where consistent blending and stable product quality are critical.
Best for: High purity and sanitary applications with strict hygiene requirements
Agitator type ALTB is a top mounted Alfa Laval agitator that includes a bottom steady bearing to enhance mechanical stability for larger tanks and more demanding duties.
The ALTB agitator shares the hygienic and modular concept of the ALT, while improving shaft alignment through the bottom bearing. This makes it suitable for taller tanks, higher viscosity products and applications where improved stability can extend service life. Like ALT, it supports CIP and is designed to maintain hygienic performance with efficient, low shear mixing.
Best for: Energy efficient mixing in large tanks with minimal maintenance needs
Agitator type ALS is a side mounted Alfa Laval agitator suited for tanks with limited headroom and applications that benefit from side entry access and serviceability.
The Alfa Laval ALS is compact yet powerful, supporting hygienic mixing duties with easy maintenance, often without needing to open the tank. Its modular design and EnSaFoil impellers deliver strong axial flow with low shear, helping reduce operating cost while maintaining consistent product quality in continuous mixing applications.
Best for: Gentle, efficient mixing with optimised tank space and easy cleaning access
Agitator type ALB is a bottom mounted Alfa Laval agitator designed for aseptic and ultra hygienic mixing, with excellent cleanability and flexible configuration options.
The ALB agitator supports sterile mixing environments and is designed to work with CIP cleaning requirements. The low shear EnSaFoil impellers provide gentle product treatment, while bottom mounting can help reduce top side intrusion, supporting hygienic design goals. External access for service can also simplify maintenance planning for continuous production operations.
Applications of Alfa Laval Agitators
Alfa Laval agitators are designed for high hygiene levels and cost effective operation across a wide range of tank based duties. Below are six common applications supported by tank mixing systems.
Keeps tank contents homogeneous
Storage tanks for milk, whey, cream, mixed dairy products, UHT products and more.
Mixes different product components together
Mix tanks for drinking yoghurt, fruit juices, flavoured milk products, sugar syrup products, oils and more.
Disperses one component within another
Tanks for powder proteins, vitamins, minerals, milk powder and oil mixes.
Maintains particle suspension
Tanks for fluids such as fruit juices with solid or semi solid particles and crystallisation tanks.
Ensures even heat transfer
Tanks fitted with jackets for heating or cooling, supporting consistent temperature distribution.
Supports dairy fermentation and mixing
Fermentation tanks for yoghurt, creme fraiche, cheese cultures and related products.
Benefits of Alfa Laval Tank Agitators
When comparing agitators types, selection depends on hygiene requirement, tank geometry, viscosity, duty objective and agitators energy efficiency based on impeller design and operating speed.
- Superior mixing efficiency
- Supports thorough blending and improved process consistency across a wide range of tank duties.
- Energy efficient operation
- Impeller designs and low shear circulation can reduce power demand, with actual savings depending on duty point, viscosity and tank design.
- Flexible modular design
- Modular configuration supports customisation for tank size, hygienic finish and process duty, improving fit for specific applications.
- Easy installation and maintenance
- Designed for practical servicing, with configurations that can reduce downtime and simplify maintenance planning.
- Reduced wear and reliable uptime
- Operating concepts designed to minimise unnecessary wear, helping support stable performance in continuous production environments.
- Improved heat distribution
- Strong circulation can improve heat transfer performance in jacketed tanks by reducing temperature gradients.
Static mixers and tank mixers, what is the difference
In many fluid handling systems, static mixers and tank mixers solve different problems. Static mixers are installed in pipelines to mix fluids as they flow through the line, using internal elements with no rotating parts. Tank mixers, such as an Alfa Laval agitator, create circulation inside a vessel to blend, suspend, disperse, or distribute heat across the entire tank volume. The right choice depends on whether mixing is needed in a pipe during transfer, or inside a tank during processing and storage.
Conclusion
Whether you are blending dairy products or handling pharmaceutical formulations, Alfa Laval agitators provide energy efficient mixing solutions that can be configured to match process needs. With modular designs, hygienic construction and impeller options for low shear circulation, these agitators can improve process efficiency, product consistency and operational reliability. If you need help selecting between agitator type ALT, agitator type ALTB, agitator type ALS and agitator type ALB, contact us today to learn more.
*As an authorised Alfa Laval distributor, we are committed to delivering genuine solutions backed by technical expertise. Our partnership ensures reliable access to equipment and support tailored to your industry needs.
