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The company has the following technologies patented:

Compact Flotation Unit one & several stages in 1 Vessel

Static Mixer for Flotation Gas


Retrofit of Separation Vessels using Stauper ́s Internals


Self-Cleaning and Adjusting Gas Injection Nozzle


CFU with a Secondary / Dual Reject System

The Process

The Stauper CFU is a vertical vessel, that utilize proven and well-known gas flotation principle. The main vehicle for separation of the oil from water is gas. The CFU utilizes both external induced gas as well as the gas already dissolved in water to separate the oil from water.

The CFU generates small gas bubbles that are induced into the produced water in a dedicated inlet chamber, where the gas coalesce with the oil droplets. The gas bubbles carry the oil to the top where oil, gas and fine particles are removed before cleaned water is ejected from the vessel.

The Stauper CFU efficiency is due to its internal design, process and fluid mechanics. Heavier solids are captured and flushed from the CFU as part of the process. The Stauper CFU has no moving parts and is very stable and robust.

How we differ from Competitors

Earlier generations CFUs are typically designed with one open vessel design where mixing, flotation and separation are done in one open setting. In this old design, smaller oil droplets and solids particles will follow the gravity and stream of cleaned water impeding the efficiency. 

The Stauper CFU, on the other hand, has a unique, patented design and fluid mechanics that differentiate from these older technologies. Utilising a separate inlet chamber where oil and gas are mixed and solids captured, there is no counter-current movements allowing for smaller oil droplets and solids to follow the clean water outlet at the bottom of the tank.

Separation takes place at the top of the vessel where water comes to a standstill, unlike open vessels where water is moving – often in a chaotic manner. Stauper CFU´s ability to capture and flush out solids will improve the cleaning efficiency and significantly reduce downstream wear and tear – for instance in re-injection pumps. Our design allows for better efficiency, even with very small oil droplets, which in turn may reduce dependency of chemicals and reduced OpEx.


The Stauper CFU can be configured to handle a large span of flow volumes and oil in water content.


The CFU is operating on a sequential cleaning principle, so with demanding flow composition, with very high oil in water content or very small oil droplets, additional cleaning stages may be required.

In these cases, the Stauper CFU can have multiple stages in one vessel.  The option of several stages in one vessel offers a very compact and light weight alternative to older designs depending on several vessels in series.

For high flow volumes, several vessels can be installed in parallel allowing for treatment of any flow rate and turn-down. The Stauper CFU can be tied in at inlet separator, replacing hydro cyclones, polishing equipment and de-gassers in the produced water treatment process train. Cleaned water can be reused, discharged or re-injected.

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