Enhance process efficiency, productivity, and end-product quality with the outstanding cleanability of your process tanks. Alfa Laval rotary jet head tank cleaning machines mitigate the risk of contamination in dairy, food, beverage, pharmaceutical, and industrial applications. Select from two series of tank cleaning machines: hygienic process models and industrial process models.

The range of rotary jet heads is categorised by the application environment and the volume of the vessel being cleaned. Industrial models prioritise durability and high-impact force for removing aggressive residues. Hygienic and UltraPure models are engineered for sectors where material traceability and surface finish must meet cGMP standards to prevent bacterial growth and ensure product safety.

Industrial models such as the GJ 8 and GJ 10 utilise a gear train lubricated with food-grade lubricants. The GJ 10 is capable of fitting through an opening as small as 10 cm and is optimised for underground fuel storage or large chemical vessels. Materials of construction for these industrial units include 1.4404 (316L) stainless steel, PPS, and PTFE, providing compatibility with a wide range of cleaning fluids at temperatures up to 95 °C.

Hygienic and UltraPure configurations

Hygienic units such as the TJ20G and SaniJet 20 are designed to be self-lubricating, using the cleaning fluid itself to lubricate internal components. This prevents external lubricant from entering the process stream. For the highest purity requirements, the SaniJet 20 UltraPure and SaniJet 25 UltraPure series offer an electropolished surface finish of Ra 0.5 µm on product-contact parts and the Q-doc documentation package. This package supports process validation by providing full material traceability, including EN 10204 type 3.1 inspection certificates and FDA compliance declarations under 21CFR§177 for all product-contacted parts. The TJ40G-HD variant is available for processes involving the recirculation of cleaning media containing particles, while the TJ40G Burst variant uses a specific nozzle construction for rapid chemical wetting, delivering a complete pattern that is 20–25% faster than the standard TJ40G configuration.

Rotary jet heads are utilised wherever manual tank entry presents safety risks or where the cost of water and chemicals exceeds sustainable limits. By implementing an automated tank cleaning strategy, facilities remove residues more consistently than manual methods while protecting personnel from confined-space hazards. The high-impact nature of these units makes them effective across a broad spectrum of upstream and downstream process vessels.

In pharmaceutical and biotech industries, the SaniJet series is used in fermentation and downstream storage vessels. These units must meet cGMP guidelines, and validating the cleaning process with the Rotacheck system is often a primary requirement. Rotacheck monitors the rotation of the head and the sequence of the jets to confirm that every part of the tank surface has been contacted by the cleaning fluid, providing a digital audit trail for quality assurance and replacing visual inspection in sterile environments.

Aggressive residue removal in chemical and petroleum sectors

In chemical and petroleum processing, rotary jet heads handle more demanding cleaning tasks. The GJ 10 is specifically designed for the petroleum industry to remove residual fuel, dirt, and sludge from underground fuel storage tanks. Because these units generate high mechanical impact, they can convert heavy sludge into a liquid effluent that is easier to extract, reducing the total time the tank is out of service. In the beverage and dairy sectors, these units are often used to retrofit traditional spray balls. Because an automated tank cleaning nozzle in a rotary configuration uses a concentrated jet rather than a spray, it can reach areas behind agitator blades or baffles that static units may miss. This leads to a more thorough clean with fewer resources, reducing effluent volumes and the energy required to heat cleaning water.

For industrial applications involving hard residues such as paints, oils, and starches, units such as the GJ 4 and GJ 8 provide the throw length and mechanical impact necessary to clean tanks from 150 m³ up to 2,250 m³. The home care, chemical, pulp and paper, ethanol, and starch industries all require the removal of the most stubborn residues from large-volume vessels, and these units are designed for exactly those duties.

The operating principle of rotary jet heads is based on geared rotation driven by the pressure of the cleaning fluid. Unlike static spray balls that rely on large volumes of fluid cascading down tank walls, these units generate a high-impact jet stream that strikes the surface with significant force. This impingement is what breaks down tough residues, allowing for a thorough clean with considerably less water. The internal gear train drives a slow, controlled rotation that maximises the dwell time of the jet on the tank surface while ensuring the rotation is precise and repeatable.

The 360-degree successively denser pattern

When fluid enters the unit, it causes the nozzles to rotate simultaneously around both the vertical and horizontal axes. In the first cycle, the nozzles lay out a coarse pattern on the tank surface. As the unit continues to operate, subsequent cycles gradually make the pattern denser until a full cleaning pattern is reached. Once the full pattern is completed, the unit restarts the sequence. This geared approach ensures that every part of the interior surface is contacted by a high-pressure jet, which is essential for consistent validation in hygienic sectors. The number of cycles required to achieve a full pattern varies by stator type and flow rate, and can be selected to optimise cycle time for specific applications.

Selecting for vessel size and throw length

Throw length is the distance at which the jet maintains effective cleaning impact. Selecting the correct nozzle diameter and inlet pressure determines both the throw length and the flow rate delivered to the tank. For small vessels such as drums and intermediate bulk containers (IBCs), units in the GJ 7 and GJ 9 ranges operate at throw lengths from approximately 1.2 m up to 6 m. For large industrial tanks, the GJ 4 achieves a maximum throw length of 30.5 m at the appropriate operating pressure. The working pressure across the range varies by model: the GJ 9 operates between 3 and 70 bar, the GJ 8 operates between 3 and 28+ bar, and the GJ 4 operates between 3 and 21 bar.

Selecting for media type and particle content

Guidance for selecting a jet head must account for the viscosity of the cleaning fluid and the presence of solids. Industrial models use food-grade lubricants within a sealed gear train. Hygienic models are self-lubricating and use the cleaning fluid to lubricate the bearings. In applications where the cleaning media contains particles, a Heavy-Duty model such as the TJ40G-HD should be specified. This model is designed to allow the recirculation of particles up to 3 mm in size without clogging the internal gear train or damaging the stator. For standard models with low particle levels, a 3 mm strainer in the supply line is recommended. Where particle content is high, a 0.1 mm strainer is recommended for standard TJ40G units. For rapid chemical coverage, the Burst nozzle configuration provides faster wetting times, producing a complete cleaning pattern that is 20–25% faster than the standard TJ40G.

Selection criteria summary

Comparison with static spray balls

The primary alternative to rotary jet heads is the static spray ball. While spray balls have no moving parts and offer simplicity, they require considerably higher flow rates because they rely on chemical action and gravity alone, not mechanical impingement. Rotary jet heads use mechanical impact as an additional variable alongside temperature and chemistry. This means they can operate at lower temperatures and with lower chemical concentrations while achieving superior residue removal. The repeatability of the geared pattern ensures that the cleaning process is consistent every cycle, which is essential for facilities using Rotacheck to validate their CIP processes. In hazardous environments, units with ATEX certification meet the requirements of Directive 2014/34/EU for Category 1 installation in Zone 0/20, providing safe operation where explosive atmospheres may be present.