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Coalescer Cartridge

Coalescing Fuel Filter

Coalescing Fuel Filter

Good versatility and compact structure.
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Used as a first-stage cartridge in Filter/Separators.

Remove particulates and coalesce water into large water drops.

Also available in screw base design.

Coalescer Cartridges - Data Sheet #VEL1732


Cost effective particle and emulsified water removal from hydrocarbon fluids

Easy installation and replacement with one-piece design

Choice of Threaded Base or Open End cartridges

Choice of All-Fiberglass Media or Combination Fiberglass and Pleated Media

Field proven performance

Ongoing qualification testing to meet changing commercial and military requirements


Coalescer cartridges are employed as the first stage in filter/separator vessels for hydrocarbon fluids. They perform two functions: (1) coalesce (combine) highly dispersed, emulsified water particles into larger water drops and (2) filter-out particulate contaminants.

How Coalescer Cartridges Work

The top photo shows a highly magnified view of the coalescing process. Tiny droplets of water contact and adhere to strands of fiberglass. Flow pushes the droplets along the strand until they reach an intersection of strands where they combine with other droplets (coalesce) into large drops.

These large drops are then carried to the outside surface of the cartridge. Having a higher specific gravity than the hydrocarbon fluid, they release and settle to the bottom of the vessel. The larger the drops, the faster and more efficiently they fall out. (See photo to the right.) In general, particle removal efficiency increases with coalescing efficiency. This is accomplished by employing a tighter, finer filtration media.

Flow direction is from inside to outside of the cartridge. This minimizes surface velocity and helps prevent the water drops from breaking up and being carried downstream.


Coalescer cartridges are used primarily to coalesce emulsified water and remove particles from hydrocarbon fluids. The largest single application is the filtration of aviation jet fuel. They are also used with other types of fuels, process in refineries and petrochemical plants, and condensate

Other liquids can be separated if they are immiscible, the specific gravities differ, and high concentrations of surface active agents are not present. As a rule of thumb, if a sample of the mixture readily separates in an hour or two, a coalescer can probably be used. If the mixture hasn’t separated after 24 hours, coalescing probably won’t work.

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