How Does a Coalescer Filter Cartridge Work?
To choose the right model, you first need to understand the mechanism. Unlike standard particulate filters that simply trap dirt, coalescing filters typically operate with an inside-to-outside flow path and rely on mechanical coalescence.
A premium Ayater coalescer cartridge usually consists of three distinct functional layers:
Inner Layer (Prefiltration): Captures solid particulate matter (rust, scale, dirt) to prevent the delicate coalescing media from prematurely clogging.
Middle Layer (Coalescing Media): Usually made of specialized borosilicate micro-glass fibers. As the fluid flows through, microscopic water droplets are forced to collide with the fibers and merge (coalesce) into much larger water drops.
Outer Layer (Drainage): Designed with materials like cotton, polyester, or Teflon. It allows the enlarged, heavy water drops to easily fall away from the filter into the collection sump by gravity, while the dry fluid passes through.
5 Key Factors to Determine the Right Coalescer Model
When cross-referencing an existing filter or designing a new filtration housing, you must evaluate the following five specifications to determine the correct coalescer model:
1. Fluid Compatibility and Application
What exactly are you filtering? Different fluids have different Interfacial Tensions (IFT) and chemical properties.
Aviation Fuel (Jet A-1) & Diesel: Require high-efficiency media to meet strict cleanliness standards (e.g., API 1581).
Natural Gas / Air: Gas-liquid coalescers require specific media to handle aerosol mists without collapsing under high gas velocities.
Turbine Lube Oil: Often requires high-temperature resistant materials.
2. Micron Rating & Separation Efficiency
Coalescers serve a dual purpose: particle filtration and water removal. You must determine the absolute or nominal micron rating your system requires. Common ratings are 1μm, 5μm, 10μm, or 25μm. The right media will ensure your effluent water content drops strictly below your target (e.g., less than 15 ppm).
3. Operating Parameters (Flow Rate & Pressure Drop)
Flow Rate (GPM or L/min): This dictates the physical size and the number of cartridges required in your housing.
Pressure Drop (Delta P): Coalescing filters should generally be replaced when the differential pressure reaches 15 PSID (1.0 bar). Knowing your system's maximum operating pressure ensures the cartridge core (usually tin-plated steel or stainless steel) won't collapse.
4. Physical Dimensions
If you are replacing an old filter, precise measurements are non-negotiable. Please measure and note:
Outer Diameter (OD): Common sizes include 6" (152mm), 4.5" (114mm), etc.
Inner Diameter (ID): E.g., 3.5" (89mm).
Length: Standard lengths range from 11", 14", 33", 44", up to 56".
5. End Cap Styles and Seal Materials
How does the filter connect to the housing manifold?
Styles: Double Open End (DOE), Single Open End (SOE), Threaded Base (typically used in aviation coalescers), or Open End with O-rings (like 222 or 226).
Seals/Gaskets: Depending on the fluid, you must choose the right gasket material-Buna-N (Nitrile) for standard oils, or Viton (FKM) for high temperatures and aggressive chemicals.
Popular Coalescer Cross-Reference: Upgrade to Ayater
Many customers overpay for OEM brand labels. Ayater Filtration manufactures 100% interchangeable replacement coalescer filter cartridges that meet or exceed original OEM performance at a fraction of the cost.
If you are using any of the following popular models, Ayater can provide a direct drop-in replacement:
| Original OEM Brand | Common Series / Part Number Examples | Ayater Replacement Capability |
| Pall | CS604LGH13, CC3LG02H13, PhaseSep Series | 100% Interchangeable, Exact Fit |
| Parker (Velcon) | CAA Series, I Series (e.g., I-644C5) | 100% Interchangeable, Exact Fit |
| Facet (Jonell) | CC Series, CM Series, CAA Series | 100% Interchangeable, Exact Fit |
| PECO / PECOFacet | FG Series, NGGC Series | 100% Interchangeable, Exact Fit |
(Note: Ayater can replace hundreds of models. If your brand is not listed above, simply contact us with your part number!)
Why Choose Ayater for Your Coalescing Filtration Needs?
Premium Materials: We source top-tier imported fiberglass and structural materials to ensure maximum water-removal efficiency and zero media migration.
Cost Savings: Reduce your maintenance budget by switching to Ayater without sacrificing system safety or fluid cleanliness.
Custom Manufacturing: Dealing with a non-standard housing? Our engineers can design and manufacture custom coalescer elements tailored exactly to your flow rate and dimensions.
Need Help Selecting Your Coalescer Filter Model?
Don't let water contamination damage your expensive machinery. Let Ayater's filtration experts do the heavy lifting for you.
Whether you need a direct replacement for a Pall, Parker, or Facet filter, or you need a custom solution, we are here to help. Send us your part number, dimensions, or working conditions, and we will provide a precise model match and a competitive quote within 24 hours.
