Gas dryers, filters and purifiers are designed to remove particulates and purify a gaseous process stream. Gas dryers may be an integral part of a gas filter, or a substantive feature. Gas purifiers can remove gaseous contaminants to levels as low as one-part-per-trillion.

Applications

Gas filtration and purification products are used in gas extraction and natural gas processing systems, as well as applications that require the removal of moisture, hydrocarbons and oxygen that can decrease yields or form oxides and hazes.  Some products are designed to reduce or eliminate point-of-use impurities in gases such as helium, hydrogen, methane, nitrogen, or carbon dioxide. Such gas impurities may cause distribution leaks, improper purging, and system breaches.

Filter Medium and Housing

Some gas dryers, filters and purifiers use a multiple bed format and special sorbents. Others use adsorptive materials to capture and retain hydrocarbons and halocarbons. 

When selecting products, filter medium material and housing material are important specifications to consider. Choices for filter medium material include activated carbon, activated clay, diatomaceous earth (DE), cellulose, ceramic, cotton, glass fiber, ion exchange resin, metal, minerals and sand, nylon, and paper. Also available are filter media made of polyethersulfone (PES), polyester, polypropylene (PP), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyvinylidene chloride (PVDC), polysulfone (PSU), and synthetic fiber.

Housing materials for gas dryers, filters and purifiers consist of aluminum, plastic, steel, stainless steel, and Teflon® (DuPont).

Configurations

There are two basic configurations for gas dryers, filters and purifiers: in-line and return line.

  • In-line filters are assemblies in which the inlet, outlet, and filter element axes are in a straight line.
  • Return line or closed loop filters catch all debris generated by the system’s components. They are designed to be the last component passed before returning to the system reservoir.

The GlobalSpec SpecSearch database contains information about both types of products.

Assembly or Element Type

Gas dryers, filters and purifiers may use bag filter elements, cartridge filter elements, or wire mesh.

  • Bag filter elements are used to filter sand, rust, and pipe-scale from plant process waters; metal shavings and wear particles from recycled cutting, quenching, flushing and hydraulic oils and coolants; and to filter contaminants that can plug nozzles in spray systems.
  • Cartridge filter elements are disposable, but cost more than bag filter elements.
  • Wire mesh (woven screen, wire cloth) is a metallic filter medium that is formed by weaving fine wires into a cloth with a controlled pore size.

Other unlisted or specialized filter types for gas dryers, filters and purifiers are also available. 


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