Coalescer gas filter for Heavy Duty
Duplex filter for separating solids and aerosols (liquid content) from gases
Flange Connection
¾” – 8” or DN 20 – DN 200
Filter element
Fiberglass/stainless steel disposable cartridges (as normal temperature and high/low temperature design); Option available for preliminary separation using demister, cyclone, or cyclone demister all within the same housing.
Grade of filtration
0,1 - 250 µm
Operating pressure
> 500 bar (size and temperature dependent)
Filter housing
- carbon steel (St 45-8 / A106B)
- stainless steel (1.4404 / 316L)
- non-welded
General Accessories and Special Equipment
1.) Connecting elements
Flexible connection possibilities
e.g., flanged, NPT, weld-on ends, ball valves, needle valves

2.) Instruments
Differential pressure connections such as optical and optical/electrical differential pressure measurement systems

3.) Materials
Filters available on request in Duplex or Super Duplex

4.) Optional equipment
Cover lifting/pivoting mechanism
Cover safety device
Special accessories for gas filtering
- Pre-separator for liquid reduction / cyclone and cyclone demister
- In addition to standard, filters also available in Duplex and Superduplex (on request)
- Liquid level switches
- Magnetic level indicator
- Bulls Eyes
- Adaptable fluid reservoir for saving the separated fluid

Duplex coalescer gas filter for generators and turbines

The high-performance duplex filter BOLLFILTER Duplex Type BFD-C HD M is used as a gas filter and coalescence separator in chemical and petrochemical plants, in the offshore industry, and in the power plant sector. This filter is primarily used for filtering fuel gas and seal gas. In cases of heavy contamination,
the filter is combined with a pre-separator, e.g. a cyclone or cyclone demister, to separate off solids and liquids. A rapidly rotating flow of gas is required in order to separate out small and lightweight particles. Therefore, the cyclone is designed under actual operating conditions in order to achieve the most efficient separation possible.

Advantages of the BOLLFILTER Duplex Type BFD-C HD M

BOLLFILTER’s Duplex Type BFD-C HD M is a duplex filter with two filter chambers combining a coalescer and particle filter for separating solids and aerosols (liquid content) from gases. It guarantees maximum purity for gases with a filter fineness of up to 0.1 micrometres and was developed specifically for an extremely high operating pressure of up to 500 bar.

Cleaning the duplex coalescer gas filter

When the soiling level of the filter exceeds the tolerance level, the active filter half can be switched out with the clean half without any pressure surges.
A ball valve is used to make the switch while filtration is still in progress. The simultaneous shut-down of both filter chambers is prevented by the design features.

Would you like to contact us?
Jörn Grotepaß, Head of Business Unit Compressors & Turbines Boll & Kirch Filterbau GmbH
Jörn Grotepaß Head of Compressors & Turbines Filtration

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