What Is a Candle Filter Housing?
A candle filter housing is a sealed pressure vessel for precise solid-liquid separation. Designed to withstand pressures up to 20 bar, Filson candle filter housing resists pressure and heat without deformation. According to customer requirements, Filson is able to manufacture candle filter housings that comply with ASME standards.
Candle filter housing seamlessly integrates into large-scale production and operates fully automatically without manual intervention to carry out the entire sequence of filtration, backwashing, and waste discharge. Both direct and precoat filtration modes are supported by the equipment, allowing operators to switch between them.
Candle Filter Housing Features
Candle filter housings are specifically designed with a backwashing system to ensure automated cleaning cycles without requiring manual supervision/operation.
The fully automated online control system can be seamlessly integrated into existing or newly constructed industrial production lines.
Backwashing starts automatically when preset differential pressure is reached. Separated solids drop to the bottom automatically.
Multiple filter elements inside the housing provide a large filtration surface area, allowing for high-flow rates.
They operate in a sealed system, which helps prevent volatile chemical leaks and reduce potential risks to the environment.
They have good corrosion resistance and can be used in aggressive environments. This extends their service life and maintains product purity.
Short gas pulses rapidly and completely discharge the filter cake, which is then collected and discharged within 10–30 seconds.
Filter Elements
Welded from stainless steel wedge wire and rods, it features a narrow outer gap and a wide inner gap, offering high mechanical strength. This is a surface filter with a micron rating down to 10 microns.
This depth filtration element is made by high temperature sintering of metal powder, providing excellent filtration accuracy. It is ideal for applications demanding high purity of filtered liquids.
A filter cloth must be fitted for filtration. During the filtration process, the filtrate enters the support tube, then flows downward into the central collection tube, and finally discharges upward.
Candle Filter Housing Applications
Candle filter housings are designed for applications that require continuous removal of fine particles and high-purity filtration. They are ideal for fine chemicals, drinking water, pharmaceuticals, and industrial processes.
Closed-loop design prevents volatilization and contamination during the manufacturing of bulk drugs, drug intermediates, agrochemicals, dye intermediates, and similar processes.
Micron-level filtration (down to 0.2 microns) effectively removes sediment, greatly improving water clarity while providing reliable mechanical filtration without contamination.
Filson offers candle filter housings made with FDA-compliant gaskets and O-rings, and internally polished surfaces designed for pharmaceutical manufacturing.
With high filtration accuracy and continuous operation, candle filter housings are ideal for recovering expensive catalysts and removing carbon in industrial processes.
Candle Filter Housing Vs. Cartridge Filter Housing
Both candle filter housing and cartridge filter housing are used for precision filtration, but there are also many differences between them.
Candle filter housing is ideal for filtering liquids with low solids, typically below 5–10%. The controlled filter cake layer is easy to remove by backwashing, so the system can run continuously. If the solids content is high, the filter cake builds up quickly, causing more frequent backwashing. Its precision filtration performance relies on filter cake retention.
Equipped with a filter cartridge that requires periodic replacement, cartridge filter housing operates intermittently. It supports both gas and liquid filtration, while candle filter housing is primarily for liquid filtration. The filtration depends on interception by the filter cartridge rather than the filter cake layer formed during operation.
More About Candle Filter Housing
To ideally match the sanitary requirements of potable water filtration, food & beverage, pharmaceutical processing, and laboratory use, we provide SS 304/316L housings with top-level performance, and FDA-compliant components are available.
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| Housing Material | SS304/SS304L/SS316/SS316L/Carbon Steel/ Duplex/Hastelloy/Titanium |
| Sealing Material | PTFE/Viton/Silicone/Buna-N/EPDM |
| Micron Rating | 0.2–150 microns |
| Flow Rate | 10–300 m3/h |
| Max. Temperature | 300 ℃ (Depending on sealing material selection) |
| Max. Pressure | 20 bar |
| Filtration Area | 0.5–50 m2 |
| Inlet & Outlet Size | 2’’–24’’ |
| Housing Diameter | 250–2500 mm |
| Housing Height | 1,000–4,000 mm |
| Candle Length | 10’’, 20’’, 30’’, 40’’, 50’’, 60’’ |
| Candle Diameter | 2.5’’–6’’ |
| Cake Thickness | 0–35 mm |
| Suspended Candle Connection | Snap-fit/Flange/O-ring |
| Standards | ASME Section VIII/FDA |
- Filtration Requirements: Define solid content, particle size, and required clarity to choose the right micron rating.
- Capacity Planning: Calculate flow rate and filtration cycle time to make sure the filter can handle the volume.
- Construction Materials: Choose materials that handlethe temperature, pressure, and chemicals involved for safe and reliable use.
The heating or cooling coil keeps the fluid temperature stable to prevent blockages. This is especially useful when filtering highly viscous or crystallization-prone fluids.
Yes, they can. Lithium ore extraction produces a lot of suspended solids. Candle filters effectively separate fine suspended particles and provide high filtration efficiency. They are used in lithium ore extraction, lithium salt production, lithium compound precipitation, and lithium recovery.
Available in PP, PE, PA, NY, and other materials, with micron ratings from 0.5 to 1000 microns.
Provides safe filtration in harsh conditions with fewer welds and excellent sealing.
Compatible with filter bags or cartridges, offering filtration efficiency up to 99.98%.
Features an electro-polished inner surface with a surface finish of 25 Ra.
Why Choose Filson as Your Supplier?
Each candle filter housing supplied by Filson is guaranteed top quality and long service life to serve in plenty of industries. If the working conditions are awfully harsh or the production processes of your products need to comply with certain management standards/regulations, we also support filter housing manufacturing guided by ASME standard with a U-stamp.
Filson candle filter housings have customized interface designs for easy compatibility with various industries. Each product comes with a Material Test Certificate (MTC), and all parts can be traced back to their original furnace number. For more information, please feel free to contact us anytime!
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