Receive our newsletter – data, insights and analysis delivered to you


Customised Oil-Mist Separators

Wiedhof 9,
31162 Bad Salzdetfurth,

The growing concern for environmental protection and the introduction of strict pollution standards for exhaust air were the basis for developing a filtration system which efficiently eliminates oil mist from the exhaust air of the lube oil system of rotating machines like turbines, motors, generators, etc.

Being both a designer and a specialised manufacturer of oil mist separators, FRANKE-Filter GmbH offers customised solutions for any type and size of:

  • Gas and steam turbines
  • Hydro turbines
  • Gas and diesel motors
  • Turbo-compressors and generators
  • Engines and gearboxes, etc.


Our systems are used worldwide in many power stations, refineries, sugar mills etc. wherever power is being generated. Renowned turbine manufacturers are including FRANKE-Filter oil mist separators in their package for newly erected power plants and also the retrofit business has an increasing demand for these separators. Turbine manufacturers applying our systems are e.g.:

  • GE: Frame 3,5,6,9, GFA – 7FA
  • Siemens: all gas turbines, all steam turbines
  • Alstom: GF 9,11,13
  • Hitachi: H25
  • Misc: Francis turbines, Pelton turbines, Kaplan turbines


The mode of operation of oil mist separators made by FRANKE-Filter is based on the coalesce effect. A vacuum is produced in the lube oil system and the air containing oil mist passes through micro-fibre filter cartridges where oil droplets are separated and flow back to the lube oil tank via an oil return pipe. Clean and dry exhaust air with a residual oil content of up to 1mg/m escapes into the open air or into the room.

Advantages offered by the system include:

  • Excellent cost / performance ratio due to customised solutions
  • Compliance with strict international exhaust air standards contributes to environmental protection
  • Recovery of expensive lube oil – depending on the size and volume flow of the turbine up to 2,000L of oil are separated from the exhaust air and fed back into the lube oil tank annually
  • Nearly no maintenance required: filter cartridges regenerate themselves and have a very long service life
  • Exact adjustment of depression in the lube oil system
  • High filter efficiency of 99.9% – mechanical separation of micro particles
  • Residual oil content in clean and dry exhaust air is far below 20mg/m


Apart from oil mist separators – our scope of supplies comprises oil and emulsion mist eliminators for machine tools, smoke filters for welding and soldering filters for the elimination of finest noxious substances.

Oil Mist Separator

Oil Mist Separator is the technical term for filter systems that are installed at electricity generating turbines and generators.

Olkiluoto 3 1600MW Nuclear Power Plant

Construction of the Finnish Olkiluoto 3 1,600MWe nuclear power plant reached a milestone on 22 June 2010, after installation of the reactor pressure vessel in the reactor building. This marked the beginning of the installation activities of nuclear components, coinciding with the start-up testing of electro-mechanical systems.

FRANKE-Filter at Hydro 2018 in Poland

FRANKE-Filter is an industrial company, which is specialised in manufacturing oil mist separators for lube oil tanks of rotating equipment such as gas, steam and hydro turbines, compressors, gas and diesel engines and generators.

2 August 2018

Franke-Filter at World Nuclear Exhibition in Paris, France

Franke-Filter is an industrial company, which is specialized in manufacturing oil mist eliminators for lube oil tanks of rotating equipment such as gas, steam and hydro turbines, compressors, gas and diesel engines and generators.

22 March 2018

Filtration of Oil Mist for the Hydro Sector

Franke-Filter, alongside its long-term partner and representative in Austria, Schmachtl GmbH, will participate at the 18th International Seminar on Hydropower Plants, taking place on 26 to 28 November in Vienna, Austria.

10 November 2014


Wiedhof 9
31162 Bad Salzdetfurth

NEWSLETTER Sign up Tick the boxes of the newsletters you would like to receive. The top stories of the day delivered to you every weekday. A weekly roundup of the latest news and analysis, sent every Wednesday. The power industry's most comprehensive news and information delivered every month.
I consent to GlobalData UK Limited collecting my details provided via this form in accordance with the Privacy Policy