Air and gas filters
From standardized modular filter to customized filter system
When it comes to protecting sensitive components or measuring equipment, the filter element plays a decisive role. Making compromises here means accepting greater maintenance effort or machine downtimes. That is why we consistently use high-quality filter solutions with long service life in the COGA (Contec gas and air filters) product area.
We can choose from a large standard range (almost 6,000 filters) or develop custom solutions for your application. We always offer the right solution and the more economical one, for virtually any application area.
CHARACTERISTICS OF COGA® CONTEC AIR AND GAS FILTERS:
- Extensive standard product range with well over 1,000 different filter types
- Various sizes and filter types
- Various material designs
- Long service life – robust industrial quality
- Low spare parts prices
- Filtration of condensate and solids
- Protection for high-quality analysis systems and sensitive components (sensors)
- Specific separation of gases and vapors with adsorption
- Ensuring operational reliability and process availability
CONTEC® COGA AIR AND GAS FILTER PORTFOLIO OVERVIEW:
- Exhaust and vacuum filters
- Absorber housings
- Compressed air filters n Stainless steel filters
- Disposable filters
- Plastic filters
- Special designs
- Filter elements such as activated carbon filters
- Generators for air and gas treatment
We work in a highly sensitive area, so we need reliable partners who understand the problems and find practical, affordable solutions.
Simon Bayer, Rotating Equipment
Maintenance Engineer
Profitability requires quality.
We test every filter solution before it leaves our house.
Filter housings
Contec air and gas filter housings made of stainless steel, aluminum or various plastics fulfill the required industrial standards. Contec filter housings and elements can be used at high pressures and temperatures, even with aggressive media.
Filter elements
Contec filter elements are harmonized to their specific application, taking into account filtration rate, differential pressure, flow rate and of course economy. We guarantee fast, gapless, cost-effective spare parts procurement for Contec filters.
Adsorber housings and adsorbents
Fine gas cleaning sometimes requires physical and chemical separation processes as well as mechanical filtration. To this end, Contec offers adsorber housings and various adsorbents and catalysts.
FAQs
COGA is the registered term used by Contec’s Air and Gas Filtration division and stands for Contec Gas and Air Filters (COGA).
In addition to the type (or, more accurately, the physical state) of the medium to be filtered (liquid or gas), the following specifications are important for designing a filter system: the flow rate (e.g., in m³/h), the operating pressure (e.g., in bar), the operating temperature (in °C), the viscosity or density of the medium, the solids content or the quantity of particles or aerosols to be separated, and the required filter fineness or separation efficiency.
In process engineering, separation efficiency describes the effectiveness of a separation process. It defines the ratio of the material retained by the filter (e.g., dust particles or aerosols) compared to the unpurified medium fed into the system.
The burst pressure indicates the failure of the filter element when fluid flows from the inside out. At the burst pressure, the filter element is destroyed, and the unfiltered medium flows through the filter. The burst pressure is many times higher than the permissible nominal pressure or operating pressure.
Nominal pressure describes the pressure in bar/mbar/kPa for which the filter is designed at room temperature (20°C).
Service life - that is, the determined operating duration of the filter - depends on the degree of contamination in the medium to be filtered, the required separation efficiency, the filter size, and the flow rate.
Viscosity indicates how viscous a medium is. As a general rule, the higher the viscosity of the medium, the more complex the requirements for the filter system become.
In particle filters, particles are separated from gases or liquids by directing the fluid flow into a housing with two connections and through a particle filter element. The flow direction within the filter element is from the outside to the inside.
In coalescence filtration, the flow direction within the filter element is from the inside to the outside. The coalescence filter element essentially consists of two parts: an inner coalescence layer and a coarser outer layer for draining the liquid. The aerosols or droplets are captured by the fine fibers of the inner layer, accumulate as they pass through the outer layer of the filter element, and enter the collection container from there.
Viton®, Nylon®, Neoprene®, etc., are registered trademarks. For example, the Viton® brand from Chemours/DuPont refers to a fluoroelastomer (FKM/FPM). Kalrez® is also from DuPont and refers to a synthetic rubber (polychloroprene, CR). Neoprene® is an extremely flexible, elastic, and waterproof material with high resistance to chemicals, weathering, and oils. Nylon® is the brand name for a polyamide (PA). Chemraz® is the brand name for a perfluoroelastomer (FFKM) manufactured by Greene Tweed.
A filter housing essentially consists of the upper part (head) and the lower part (sump/cup), which together enclose the filter element. There is a gasket between the head and the sump, the material of which varies depending on the filter medium. The filter housing is equipped with connections (inlet/outlet), brackets, etc. The filter housing is made, for example, of aluminum, stainless steel, plastic, or combinations thereof.
Filter housings offer a wide range of connection options, primarily as female threads in inch sizes ranging from 1/8 to 3". Typical connection types include inch threads (BSPP, BSPT, NPT).
A differential pressure indicator is used to find how “clogged” a filter element is. This allows you to determine when the filter element should be replaced to ensure the system functions properly and to prevent costly downtime.
Filtration, absorption, and adsorption are separation processes:
Filtration mechanically separates solids using screens or filters. Adsorption binds substances (gas/liquid) to the surface of a solid. Absorption, on the other hand, absorbs substances into the interior of a material (by volume).
- Filtration (mechanical): A mixture of solids and liquids or gases is passed through the filter medium. The solids are retained based on their size.
- Adsorption: Adsorption refers to the attachment of atoms or molecules from liquids or gases (adsorbate) to a solid surface (adsorbent). It is often used for purifying gases.
- Absorption: Absorption refers to the uptake or incorporation of substances into another material or body. The gases or liquids to be filtered (absorbate) penetrate the interior of another substance (absorbent). This involves physical or chemical dissolution.
Drain valves on filter housings are used for controlled emptying, pressure relief, or condensate drainage. This allows the housing to be emptied, for example, before a filter change, or for contaminants to be drained without having to interrupt the filtration process.
Depending on the application, drain valves range from simple manual valves to automatic systems. Common types include manual drain valves, automatic float-type drain valves, electronic solenoid valves, and pressure relief valves.
Filter size depends on many factors, such as the separation efficiency, the desired filtration result, the expected service life, and the purchase cost. Contec will be happy to provide you with quick and expert advice, taking all necessary parameters into account.
