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Filtration · Final Stage Polishing

Cartridge Filter Housings

Fine filtration, ordinarily applied as the final stage ahead of the product or process. A cartridge housing accommodates one or more replaceable elements and is normally installed downstream of a coarser filter, since cartridge media is not intended to carry a heavy solids loading. Where contamination is below approximately 100 ppm, cartridge filtration is the appropriate selection.

Single and multi cartridge housings are manufactured in simplex and duplex configuration, with cartridge count and length selected against the flow rate and the required change out interval.

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Flair cartridge filter housing installed on a process line Photograph of completed unit
Cartridge Filter Housings
Construction & Types

Configuration and element fit

A cartridge housing accommodates one or more replaceable cartridges within a pressure vessel, sealed by an end fitting appropriate to the cartridge selected. Housings are specified as simplex or duplex, and cartridges are specified by their sealing arrangement.

Simplex Standard duty

A single housing accommodating one or more cartridges. The most economical configuration, applicable where the line may be isolated briefly for element change out.

Duplex Continuous duty

Two housings with a changeover valve, permitting flow to continue through one chamber while cartridges are changed out in the other. Specified where the process cannot be interrupted.

DOE Cartridges Double open end

Sealed against the housing at both ends using flat gaskets and an adaptor. A simpler, more economical fitting arrangement, suited to less critical duties.

SOE Cartridges Single open end

Sealed at one end only through a fitting such as code 3, 5, 7 or 8, giving a more positive, bypass-free seal. The more common choice for process plants.

Specification

Standard range

Where a stated range does not cover a particular requirement, equipment is engineered to the customer specification.

Cartridge length 10, 20, 30 and 40 inch, and multiples thereof
Cartridge type DOE, SOE code 3, 5, 7 and 8
Construction Simplex or duplex, fabricated
Design code ASME Sec VIII Div 1 where required
Filtration range 0.5 to 100 micron according to element
End connections Flanged, screwed, or triclover for sanitary duty
Closure Swing bolt, eye bolt, clamp or quick opening
Options Differential pressure gauge, vent and drain connections, internal polishing for pharmaceutical duty, legs or skid mounting, air release
Materials of Construction

Grades routinely handled

Carbon Steel SS 304 SS 316 SS 316L FRP PP

Stainless steel is the standard specification for pharmaceutical, fine chemical and sanitary duties, with an internal mirror polish offered where a clean, non-particulate-shedding finish is required. Carbon steel housings are supplied for general service and utility duties, and FRP or PP construction is offered where the process fluid calls for it. The cartridge element is selected independently of the housing material, against its own filtration and chemical compatibility criteria.

Applications

Where these units are installed

Final polishing filtration on product lines Pharmaceutical and fine chemical process filtration requiring an internal polish Pre-filtration ahead of reverse osmosis membranes Solvent, resin and coating filtration Compressed air and gas filtration
FAQ

Common questions

A DOE (Double Open End) cartridge is sealed against the housing at both ends using flat gaskets and an adaptor, while a SOE (Single Open End) cartridge seals at one end only, using a fitting such as code 3, 5, 7 or 8. SOE is the more common choice in process plants as it gives a more positive, bypass-free seal. Confirm your preferred code at enquiry stage and we will configure the housing accordingly.
Cartridge filtration is the appropriate choice where the fluid is already relatively clean, ordinarily below about 100 ppm solids, and where a finer, more consistent micron rating is required than a basket or bag can provide. Where the solids loading is higher, a bag or basket filter is fitted upstream to protect the cartridge and extend its life.
Cartridge count and length are sized against your flow rate, the viscosity of the fluid, and the change out interval you want to achieve. A higher flow rate or a longer interval between change outs generally calls for more cartridges, more surface area, or a longer element. Send us your line size, flow rate and fluid and we will size the housing for you.
Cartridge elements are available across a wide range of micron ratings, from sub-micron absolute grades used in fine polishing duty up to coarser nominal grades for general clarification. The rating is selected against the contaminant size you need to remove, so confirm your target clarity or the downstream equipment you are protecting.
Yes. Housings for pharmaceutical, fine chemical and food-grade applications are supplied with an internal mirror polish and, where required, triclover end connections in place of flanged or screwed joints, to suit clean-in-place and sanitary handling requirements.
Yes, this is a routine specification. The housing is selected against the process fluid and pressure rating, while the cartridge element is selected on its own filtration and chemical compatibility criteria, so the two are specified independently.
Standard housings are built to ASME Sec VIII Div 1, and IBR construction is offered on request where the application requires it. Advise us at enquiry stage so the unit is engineered and documented accordingly from the outset.
A differential pressure gauge, vent and drain connections, legs or skid mounting, and an air release valve can all be fitted. Specify the process conditions and duty and we will confirm which options are relevant.
Enquiry

Request a quotation for Cartridge Filter Housings

Give us the line size, flow rate, fluid and operating conditions and we will engineer directly against them. Most enquiries are answered the same working day.