Category Archives: Sanitary Cartridge Filters

Your Guide To Different Types Of Industrial Cartridge Filters

With the vast array of industrial cartridge filters available on the market today, it can be difficult for you to figure out what shape, size, and type is right for his or her specific filtration needs.

The fact that most cartridges have complicated, jargon-filled names like “2.5 DOE” and “Type 226 Option G” can add another layer of confusion to the decision making process.

In a continual effort to help our clients and provide you with information that is applicable to their responsibilities, we have created this guide for you to help clarify cartridge filter terminology and simplify your ordering and re-ordering process.

DOE vs. SOE Cartridge Filters

One of the most common and simple classifications of cartridge filters is as either DOE or SOE.  They both have their own advantages and disadvantages:

  • DOE – The most common filter cartridges found are DOE, or Double Open Ended.  These cartridges have no built in seals on either end, thus the name.  Instead the filter cartridge housing is relied upon to seal one side and stop contaminants from bypassing the cartridge.
  • SOE – As the name indicates, Single Open Ended cartridges have one end sealed.  This seal is usually accomplished by using a polyporpylene cap.  By using a cap on one end, filter bypass is impossible, so systems that require higher purity filtration typically implement this type of cartridge filter.  The higher cost associated with the end cap prevents this type from being used in general applications.

Cartridge Filter Naming Terminology

In addition to the SOE and DOE divisions, industrial cartridge filters can be named by type, function, or after a component of the filter.

  • Type 222 – This type of filter is almost always SOE, utilizing a cap on one end.  They contain double gaskets that seal against the cartridge filter housing to provide better bypass protection than a typical DOE cartridge.
  • Type 226 – Also known as sanitary cartridge filters, Type 226’s have double gaskets which are similar to the Type 222.  Locking fins are included with this type of cartridge, which ensures proper installation of the filter.  When installing this type of cartridge into the sanitary cartridge filter housing, it must be properly lined up with the opening and twisted as it is pushed in.  This ensures a full lock and proper bypass protection.
  • Flat End – Typically used with DOE and Type 222 compatible cartridge filter housings, flat end cartridges are SOE with a flat plastic cap used for the seal.
  • Spear – An SOE cartridge with a pointed cap instead of a flat one.  It utilizes a bracket to eliminate the ability of the cartridge to sway, allowing it to maintain a seal.  Type 226 cartridges may also have this end configuration.
  • High Flow Cartridges – Designed for high flow rates, these cartridges have a much larger surface area than standard cartridges.  Most are 6.5″ diameter by 40″ long with a maximum flow rate of 350 gpm, whereas standard 2.5″ diameter by 10″ long cartridges have a maximum flow rate of 5 gpm.

Just imagine the impact a perfect cartridge filter would make for your specific application… Call us now at 248-427-9090, we’ll be happy to help you get the right filters.

How To Avoid Problems When Changing Filter Cartridges

Although Filtra-Systems is known for designing and manufacturing great industrial filtration systems, we have also earned our reputation by providing excellent customer support to our clients around the world.

In addition to standard field service and replacement parts, we believe that educating our clients on product maintenance and best practices ensures that our clients are getting the most out of our systems for their business’ needs.

Minimizing potential issues for our customers is what we hope to achieve with this 8-step guide on how to properly replace cartridge filters.

Proper replacement of these cartridges reduces the risk of future problems occurring and maximizes floor cleanliness.

Your 8-step cartridge filter changing guide:

  1. Isolate the filter housing.  Closing valves on both the inlet and the outlet will ensure that fluid is not introduced into the housing while it is open.  Backpressure from the system may cause fluid to flow back into the housing, so it is important to close the outlet isolation valve as well.
  2. Open the vent valve.  Venting the housing will allow excess pressure to bleed off, eliminating dangers when opening the housing.  It will also prevent the housing from air locking when attempting to drain it.  The vent should be plumbed to an upstream tank, to minimize operator exposure to process fluids.
  3. Open the drain valve.  The housing must be drained before the cartridges can be accessed.  Drain the fluid from the housing, and reintroduce it to the system upstream of the filter.  A process should be developed that will ensure maximum plant cleanliness.
  4. Open and remove the lid.  Remove the top plate so that the cartridges may be accessed.
  5. Remove cartridges, and discard.
  6. Install new cartridges.  If Type 226 cartridges are used, remember to twist the cartridge into the base of the housing, so that they lock.  Re-install the top plate, and tighten so that there can be no fluid bypass of the cartridges.
  7. Check the vessel gasket for defects, and make sure that it is in the proper position.  Replace the lid.
  8. When refilling the housing, make sure that the drain is closed, and vent is open.  Open the inlet, and leave the outlet closed.  Venting the housing while refilling it will prevent air from being trapped in the housing.  When the housing is full, and no air bleeds through the vent, close the vent and open the outlet.  The housing is now back online.

Filtra-Systems cartridge housings are designed to be simple, safe and easy to use.

Following these easy steps will eliminate spillage and will ensure that leakage does not occur while the filter is in operation.

To see our full line of cartridge housings, click the link below or call 248-427-9090. >