Coalescer Filter Element
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Coalescer Filter Element for Removing Solid Particles from Gases

Coalescer filter element is constructed of multiple composite materials after special processing. It has good hydrophilic property and is mainly used in gas-liquid separation and liquid-liquid separation applications in the chemical industry. It not only removes solid particles from gases, but also separates trace liquid droplets (water droplets or oil droplets) from the gas through demulsification, and coalesces these small droplets into larger droplets for further medium purification.

A vertically placed coalescer filter element is displayed.
Working Principle

The medium enters the coalescer filter shell and is distributed to each coalescing filter element by the coalescing filter tray. The liquid flows from inside to outside of the coalescer filter element. Firstly, the liquid passes through the filter layer and filters out solid impurities, and then flows through the demulsification layer and separates the emulsified water from oil. Finally, small droplets coalesce on the coalescence layer and forms larger droplets. The larger droplets settle to the bottom of the shell due to gravity. The whole filtration process of the coalescer filter element is finished.

The coalescing process of the coalescer filter element
A ball of polyester fiber is displayed

Polyester Fiber Coalescer Filter Element

It is usually made of synthetic polyester fiber that has good compatibility with various fluids. The filter cartridge is spirally rolled in a multi-layer structure, with each layer using fibers of different properties. The desired filter rating is achieved by controlling parameters such as the shape, size, thickness and density of each fiber layer.

A ball of glass fiber is displayed.

Glass Fiber Coalescer Filter Element

It is made of high density gradient glass fiber that can efficiently coalesce liquid mists and liquid droplets in the airflow with high filtration precision. In addition, it has a stable structure, no media fiber shedding, no pollution to the environment and downstream products. It has good compatibility with various fluids, and good environmental protection property.

  • Cellulose Paper/Fine Filter Paper. It is used to filter out solid impurities from the media.
  • Non-woven Support Fabric. It absorbs tiny liquid droplets onto the surface and separate oil from water.
  • Supporting Tube. It is generally made of stainless steel or carbon steel to provide support for the filter media and offer good acid and alkali resistance and corrosion resistance.
  • Water Absorbent Material. It absorbs small droplets and gathers into larger droplets.
  • Glass Fiber Matt. It allows larger droplets to fall off and finish the water-oil prefiltration.
  • Reinforced Support Mesh. It provides great outer support for the filter element.
The coalescer filter element structure  with every layer structure and material
Pleat Type

Standard pleats

Deliver effective impurities removal efficiency.

M pleats

Offer increased effective filter area.

End Cap Type

As coalescer filter element filters out impurities from inside to outside and then coalesces tiny droplets, so it is single open ended. Generally, bolt in end caps or end caps with a handle are adopted for the sealing end while flat end caps or threaded end caps are used for the opening end.

The end caps are made of integral thermally bonded polyester, polypropylene, or metal. As for filter elements with a metal flat end cap , their seal rings can be constructed of NBR, Viton, EPDM or silicone rubber. Customers can customize the end cap type and seal material according to their needs.

End cap with a seal ring

Offers good seal effect.

Thread connection

Makes the filter element installation more stable.

Seal end bolt connection

Makes the filter element installation firmer.

Coalescer filter element with a handle end cap

Makes the installation and removal easier and faster.

  • Filter rating: < 0.3 μm, 0.3 μm, 0.5 μm, 1 μm, 5 μm, 10 μm
  • Initial differential pressure: < 0.05 MPa
  • Water separation capability: water content ≤ 0.05%
  • Dirt holding capacity: 1.3 g (L/min)
  • Free and emulsified water content after filtration: diesel < 50 ppm, jet fuel/avgas < 15 ppm
  • Solid impurity content after filtration: < 0.26 mg/L
  • Fiber content after filtration: < 10 PCS/L
  • Operating differential pressure: 0.1 MPa
  • Construction strength: 0.7 MPa
  • Recommended operating temperature: 115 °C
Coalescer filter element specification coding interpretation
Table 1: Specifications of Coalescer Filter Element
Model Length (mm) Inner Diameter (mm) Outer Diameter (mm)
BD-C-29 290 89 152
BD-C-58 580 89 152
BD-C-73 730 89 152
BD-C-86 860 89 152
BD-C-114 1140 89 152
BD-C-145 1450 89 152
Notes: Other specifications are available upon request.
Filter Element Replacement Conditions
  • Pressure rises. It may lead to reduced flow rate and affect the fluid flowing.
  • Damaged end cap. It may result in plastic chips circulating in the filter and further leading to filtration failure.
  • Flattened pleats. Contaminants in the coalescer filter element are saturated, hindering the fluid flowing
  • Damaged filter media. It may cause the contaminants flowing through the fluid.
  • Multilayer composite structure filter paper is used for high filtration precision
  • Filter material after special processing is adopted to provide good coalescing effect.
  • High dirt holding capacity, long lifespan
Filtration Industries
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