Oil-water separators with compressed air

Economical & environmentally friendly

Our products

Function & Structure

Frequently asked questions about oil-water-separators

Oil-water-separators – Economical & environmentally friendly

Compressed air condensate mostly consists of water. However, compressing air introduces considerable amounts of impurities and hydrocarbons. To avoid disposing it as hazardous waste – which is expensive – treatment with specialised oil-water-separators offers a cost-efficient solution.

FST’s oil-water-separators reliably separate oil and particles from the water. The result is pure condensate water that conforms to the regulations of the German federal water act. It can be disposed of in wastewater without any concern.

Our products

FST’s high quality oil-water-separators are available in three different product series called CSQ, CSJ and CSW.

Oil-water-separator CSQ

The modern oil-water-separators in our CSQ series utilise the innovative principle of active separation to treat condensate efficiently and extremely hygienically.

Its cartridges are permanently flooded with water and even when saturated only reach a maximum load of 25 kg. This effectively prevents the formation of, and contact with harmful bacterial cultures. Clean and ergonomically favourable maintenance is a blessing for every service technician. Thanks to a smart, electronic control system, monitoring the CSQ oil-water-separator is child's play.

Depressurised condensate is guided through the filter cartridges with the aid of a small amount of compressed air and arrives in the collector after being purified. At the end, it can be disposed of via the clean water tank.

Nom. volume flow

600–5.400 m³/h

Connection

G ½”

Product data sheet

Oil-water-separator CSW

Zwei verschieden große Öl-Wasser-Trenner CSW der Firma FST

Our CSW series oil-water-separators are a compact unit separating oil from water – all this without any additional energy requirement. This separator efficiently adheres to the threshold set by the federal water act (WHG) while also being approved by the „Deutsches Institut für Bautechnik (DIBt)“. By the way: Freely accessible sedimentation stages make for easy maintenance.

Nom. volume flow

108–6.000 m³/h

Connection

G ½”

Product data sheet

Oil-water-separator CSJ

Öl-Wasser-Trenner CSJ der Firma FST nach dem Zweikammer-Prinzip

Our CSJ series oil-water-separators achieve impressive residual oil values of less than 10 ppm. This means they separate water and oil even more efficiently than the threshold required by § 7 of the federal water act (WGH).

In this series, we only use durable, high-performance filter elements made of polypropylene and activated carbon. Due to its high dirt holding capacity, this separator works especially economically. The filter element almost completely absorbs the oil, meaning that no additional oil tray is necessary.
Employing the 2-container-principle, the condensate consecutively flows through both containers. A float indicator indicates the filter elements‘ saturation. If need for a change arises, FST customers can simply swap the polypropylene and activated carbon bags with a new SEWAPAC-package.

Nom. volume flow

120–3.600 m³/h

Connection

G ½”

Product data sheet

Does your company require higher volume flows, different voltages or operating pressures? Separable, emulsified condensate requires a special design of the oil-water-separator or the use of emulsion separation systems.

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Oil-water-separators – Function & Structure

Oil-water-separators reduce the condensate’s contamination to specific thresholds. They commonly employ a two-container principle. In those containers, the condensate and oil are separated and treated in multiple stages.

Separating oil from water does not require energy: Purely mechanically the condensate flows through singular containers of different height. Highly modern oil-water-separators, such as FST’s CSJ series, have the same functionality. However, all chambers are combined into a single, compact unit.

[Translate to English:] Flussdiagramm veranschaulicht Aufbau und Funktionsweise des Öl-Wasser-Trenners CSW der Firma FST

Venting chamber with condensate inlet

In the first step, the condensate is fed into the venting chamber of the oil-water separator, possibly having a small residual pressure. There, the pressure is eventually reduced to atmospheric levels. An activated carbon filter rids the venting expansion air of any smell.

Sedimentation stage with oil outlet

Condensate “rests“ in the sedimentation stage. Heavier contaminants sink to the bottom while big oil droplets rise to the top. The latter form an oil layer on the water surface. This oil then leaves the oil-water-separator flowing out of the oil outlet.

Oil storage filter

Subsequently, the oil storage filter removes small, non-floating oil droplets from the condensate. The storage filter consists of a fine knitted fabric of oil-attracting (oleophilic) material. Small droplets of oil adhere to its surface and are then stored in the filter and filtered out of the water.

Activated carbon adsorption with water outlet

Finally, an activated carbon filter removes dissolved residual hydrocarbons from the condensate. Filtration with activated carbon finally completes the condensate treatment process.

The end product "dischargeable" water then drains out of the oil-water separator via a water outlet. It can now be discharged into the sewers or other bodies of water without worry. Using a test valve, trained personnel can take a condensate sample from the activated carbon filter. This way it is possible to determine the saturation – and thus if a filter change is due.