Category Archives: Industrial Cartridge Filters

Improve Purity and Reduce Operating Costs with our Bag and Cartridge Filters

Companies looking to improve their purification processes and who wish to reduce operating costs can utilize advanced technology through Filtra-Systems’ bag and cartridge filters. Our bag and cartridge filters are effective and uniquely formulated to help companies meet their operational needs. These filters can be implemented in a variety of ways depending on the needs of your business. This article reviews what you need to know about our bag and cartridge filters.

Companies Can Save with a Wide Range of Filter Options

Filtra-Systems offers a unique range of filters: there are single, multiple, duplex bag filter housings, as well as filter bags for various end-user applications. Cartridge filter housings and replacement cartridges are also available, and they are popular products that offer lasting results. Cartridge filters developed by Filtra-Systems process between 1 and 1200 gpm, and larger units can be built to order. Cartridge filters can be conveniently disposed of by throwing away (depending on the material they are removing).

Filtra-Systems offers an assortment of filter bags with our advanced technology, including nylon monofilament mesh, activated carbon, and polyester (needle felt) bag filters. There are also uniquely designed filter bags for oil absorption and removal. These filters trap and remove elements such as acid, waste, and other hazardous materials, and our filter bags are highly efficient, so they last. Fiber migration and material bypass are minimized.

Our Bag Filter Housings are Engineered for Multiple Industrial Filtration Applications

Filtra-Systems engineers a line of products that includes filter housings for different applications. Carbon steel, 304 stainless steel, and 316 stainless steel housings are all kept in stock. With over 30 years of experience, we can meet the unique needs of customers for applications such as brewing, biodiesel production, coolant filtration, and more. Our housing equipment is designed to have several applications. Some housing units hold one filter while others can hold a few. Housings equipment options are suitable for applications with high pressure, high flow rates and those simply with higher demands. Dual and individual operation options are also available.

Cartridge filter housings are an additional option. Cartridge filter housings are commonly used in industries relating to food & beverage production and cosmetic industries, to name a few. These options offer quality filtration needs while meeting industrial and environmental standards. Our purification options allow customers to stay in control of operating costs while maintaining energy efficiency. To speak with Filtra-Systems about your filtration needs, contact us today, and stay tuned to our blog for more on saving money with our customized filtration solutions.

The Importance of Measuring Pressure Drop

One of Filtra-Systems’ objectives is to help other companies improve their operational processes by efficiently filtering industrial water. Two solutions we offer our customers, bag filters and cartridge filters, are used in a wide range of industrial processes by companies in varying industries. Even though these filtering solutions are ubiquitous throughout industry, too many organizations neglect or improperly maintain them.

The Negative Effects of Poor Maintenance

Poor maintenance of filtering systems has a measurable adverse effect on business. One of the most overlooked aspects of proper upkeep is tracking the pressure drop across the filter housing. Both bag and cartridge filters are usually sized so that the pressure drop with clean elements is less than 1 psi. As the filter media collects dirt, sediment, and other contaminants, the pores in the media become clogged. The initial result of this is a less efficient system due to the clogged media’s restricted flow and increased pressure drop across the media. The differential pressure increases as more and more material is collected.

If left unchecked, the elements have the potential to rip, leading to a failure in filtering incoming fluid. Not only will no filtration occur, but previously captured contaminants will also be released. The failure of an operation’s filtration system can cause the entire operation to come to a halt, something every business wants to aviod. This can of course lead to missed deadlines and disappointed customers. Such negative effects are entirely avoidable if the proper measurement of pressure drop is observed.

How to Measure Pressure Drop

To prevent bags and cartridges from failing, the differential pressure across the filters should be tracked. This can be done by either using two pressure gauges (one upstream of media, one downstream), or a single differential pressure gauge. A typical bag will need to be replaced when the pressure drop reaches 10-12 psi, and most cartridges need to be changed when the pressure drop reaches 15-35 psi. Following these simple rules ensures that both bag and cartridge filters will continue to operate correctly.

Types of Industrial Water Treatment Equipment

Industrial water treatment equipment comes in a variety of implementations, all designed to suit particular operating needs. Filter presses, bed filters, cartridge filters and bag filters all excel in their intended applications. We’ll look at each type of filter and examine what applications it is most appropriate for below.

Filter Presses

Where most industrial water treatment equipment is designed to remove solid material from water, filter presses are designed to remove water from the solids. Filter presses are ideal for any filtration application where enough material needs to be removed so that more conventional filtration methods would be ineffective. A filter press operates, as the name implies, by exerting physical pressure usually in the form of either air or a water-filled diaphragm on a slurry mixture and extracting the moisture. The remaining cake of material is then disposed of.

Bed Filters

Bed Filters are filters with a bed of material (typically crushed walnut shell, sand, anthracite or activated carbon) that removes contaminants. Material is collected throughout the depth of the bed, allowing large amounts of material to be collected before a backwash cycle is initiated. Inlet water pumps through the filtration medium, which collects and suspends contaminants. Once the medium is saturated with contaminants, a backwash cycle is initiated. The filtration medium is fluidized and washed. This industrial water filtration method cleans the medium and readies the filter for use. This reuse of the filtration medium minimizes waste associated with the process.

Cartridge Filters

Cartridge filters are disposable, replaceable, self-contained filtration units. They consist of a central perforated core wrapped in layers of filtration material. Inlet water is pumped in through the top of the filter core, and passes through the walls of the filter. Contaminants can be caught throught the depth of the filter cartrige, which allows individual cartridges to achieve very high filtration efficiencies. Cartridge filters are typically used where high purity water is required.

Bag Filters

Bag filters are similar to cartridge filters in that they are also disposable and replaceable. Bag filters are shaped like a large sock, and are sometimes called sock filters or filter pots. They catch contaminants on the surface of the bag, and are typically used as a low cost option to remove particulate from wastewater streams.

Industrial Wastewater Treatment Solutions For Your Company

Selecting the right water treatment solutions for your particular needs is sometimes a difficult process.  There are a lot of contributing factors to consider: the rate of filtration, the size of expected contaminants, the harshness of the expected operating environment, and even the intended use of the filtered water.  Fortunately, there are many industrial water solutions available and, with some consideration, the best water filtration equipment for the job can be determined.

Intended Use

One of the most important factors in selecting the right water treatment solution is its intended use.  For some applications, the clean water itself is the desired product of the process.  For others, the material that is filtered is the primary concern.

If the water itself is the focus of the filtration, there are many solutions that may be appropriate.  Factors such as flow rate and minimum contaminant size become more important.  If the water you are filtering contains oil-based contaminants, walnut shell media would be a good choice.  If the water is intended for drinking, there are a number of bag filters with an activated carbon layer that would remove any unwanted tastes and smells.

Flow Rate

Desired flow rate is a signficant point to consider when selecting water filtration equipment.  Cartridge filters, bag filters, deep bed filters, and filter presses are all sized differently, and the liquid flow rate can have a large effect on the size of the filter.  It is important to have a general notion of how much fluid you will need to pass through your industrial water filter to meet your production needs.

Operating Conditions

It’s also necessary to consider the conditions under which your industrial water treatment system will operate.  Bag filters, for instance, are an excellent disposable filter medium, yet many are not rated for high-temperature applications.  The corrosivity and other chemical properties of the inlet water (eg acidity) will also determine what materials need to be used for both the filter medium and filter housing.

There is a wide range of water treatment solutions available, and we can help you find the right fit for your particular need.  Get in contact with one of our filtration experts and we can help find the right solution for you.

How Industrial Water Filters Work

Industrial water filter design centers around separating contaminants, either solid or liquid, from a process fluid.  There are generally two types of industrial water filters designed for this use: surface filters, which consist of a single layer of filter material and rely on physically straining the fluid to extract contaminants, and depth filters, which are designed to use a porous filtration medium to collect contaminants throughout the medium, rather than just on the surface.  Depth filters are used predominantly in industrial water treatment because they allow the filter to retain a higher volume of contaminants before becoming clogged. This is due to the substantially higher available collection area (since contaminants are being collected throughout the depth of the medium, rather than merely on the surface layer of the filter).

Depth filters used in industrial water filtration typically use one of two types of filtration systems: filters with a bed of media, or cartridge filters.  While both of these systems perform similar activities, they differ in their effectiveness and optimal use.  Both types of filtration systems rely on fluid being forced through the filtration medium, either by pumping or using gravity to drain through.

Fluid is driven through the filter medium following constricted, tortuous routes, and the contaminants are caught, either due to direct collision with the filtration medium or precipitated by molecular attractive forces.  The selection of the type of filter media to remove contaminants is dependant on removal goals, as well as the type of contaminant.

Deep Bed Filters

Many different types of material are used in filter beds.  Sand filters are typically used in municipal treatment plants, walnut shell filters where oil removal is needed, and activated carbon for removal of heavy metals and other contaminants.  Over time, once the filter becomes restricted with captured particulates, a backwash of the bed is initiated.  Flow is redirected so that the downstream equipment is not contaminated, and the filtering layers are mechanically agitated.  Water is circulated through the filter during the agitation process to collect contaminants and, once the process is complete, exits through the backwash screen.  This screen allows the waste to pass through while retaining all of the filter media.  The wastewater is then sent to either upstream processing equipment or waste handling, and the filter is again ready for use.

Deep bed filters are used to filter drinking water, polish wastewater or cooling water, and as pretreatment for water desalination.  They are particularly effective as a means of removing solid particulates while minmizing maintenance.  The ability to backwash deep bed filters eliminates the need to replace filter media.  If activated carbon is used as a filtration medium, the filtration process will also remove tastes and smells from the filtered water.

Cartridge Filters

Cartridge filters for industrial water treatment systems usually consist of a single piece of filter material wound around a perforated cylinder, which is made of metal or plastic.  The unfiltered fluid enters the filter and is forced through the medium.  Once the filtration medium has reached its maximum contaminant load, it is discarded.  Cartridge filters are a low cost alternative to bed filters, that can achieve very high contaminant removal efficiencies at a fraction of the cost.

DOE Cartridge Filter

A 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 an engineer to figure out what shape, size, and type is right for his or her specific filtration need.  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 educate our customers and provide them with information that is applicable to their responsibilities, we have created this guide to clarify cartridge filter terminology and hopefully simplify your business’ 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 ensure 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.

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 customers on product maintenance and best practices ensures that our customers 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.

Our 8-step 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.  Back pressure 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 to use and safe.  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 here: http://www.filtrasystems.com/industries/bag-and-cartridge-filter-products/