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Polymer Filtration Systems

Over 3000 Systems Worldwide

For All Your Polymer Processing Needs

In addition to polymer filter elements, we also design and manufacture complete filter systems, including in-line systems for batch processing and duplex systems for continuous, uninterrupted service. Incorporating advances made through our unsurpassed flow modeling and CAD/CAM technologies, Pall filter systems are in service around the world, in critical applications throughout the polymer processing industry. Advanced computer modeling allows Pall engineers to optimize the flow field design of each element tube bundle, diverter valve and filter housing. The result is filter systems with minimum pressure drop, no low flow areas, and maximum on-stream life between filter change-outs.

Inline Systems

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Pall's Inline systems allow users who are interested in running batch processes to easily filter at all performance levels.  Inline or "simplex" systems utilize a single housing to filter at the required efficiency level.  These housings can be oriented in either horizontal or vertical configurations and can house either discs or candles.  The flow rate range for inline housings is nearly boundless - anywhere from 1 to 250 elements have been used depending on system requirements.  Each one is sized specifically with your application, process conditions, and quality requirements in mind.  Like all of Pall's filter systems, these have been specially designed to reduce flow flow areas, decrease overall residence time, and enable easy filter changeout.

 

There are a variety of options available based on your flow rate, element type, changeout schedule, and budget.  Horizontal housings can come with a "hardback" option - this allows users to simply disconnect the housing from the wearplate and lift it out without having to disconnect any process lines during filter changeout.  There is also the option instead for a straighthrough design to eliminate extra elbows and turns which can help keep residence time and pressure drop low.

 

Vertical simplex housings also come with a variety of options.  Once again a "hardback" or hanging cage design is available.  This makes changeouts quick and efficient since the hanging cage self-aligns and requires only 6 bolts to be removed without any process connections being broken.

 

 

self aligning inline system

Self-aligning hanging cage design.

self aligning inline system

Easy, quick bolt attachment.

horizontal inline system
vertical inline system

Continuous Filtration Systems

Pall's Continuous Filtration Systems (CPF) operate using parallel filter circuits that permit continuous, uninterrupted process filtration.
Pall's Continuous Filtration Systems (CPF) operate using parallel filter circuits that permit continuous, uninterrupted process filtration.
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Our CPF systems are designed for ease of operation and maintenance, and they eliminate the need for breaking heating connections and disassembling interconnecting piping during filter housing changes. As a result, CPF housing changes can be completed in less than 30 minutes. Custom systems may be designed for specific applications requiring enhanced flow properties and all CPF systems are designed to offer safe, dependable and uniform heating.

 

In operation, one filter housing and element assembly is on-stream until a predetermined differential pressure is reached. Then, by operating the two handwheels or an automated actuator, the spool valves are repositioned, in proper sequence, to progressively close off flow to the housing containing the “dirty” filter elements, and divert flow to the off-stream housing containing the clean filter elements. Vent valves are incorporated to purge the air during the filling of the off-stream housing to maintain balanced system pressure and prevent entrainment of air in the processstream. Upon completion of the changeover sequence and the “dirty” housing/element assembly can then be removed and replaced with a clean assembly. CPFs can be designed to work with candles or discs.  Depending on your process needs, there may be a polymer filter element design that will work best for you.

 

100 Series CPF System - For applications with low flow rates.

 

 

Our CPF Model 100 series are standard horizontal systems with a compact design, ideal for applications with low flow rates and/or limited space.  The valves are operated manually and can provide a smooth, “bumpless” changeover, with no disruption to the down-stream process.

 

Nearly all 100 series models involve only two (2) bolts in the housing removal and installation process.  Since no process connections are broken and handling fixtures are incorporated into the design, exchanging a clean filter bundle for a dirty one is simple and efficient and can be done while the parallel housing continues to process and filter the polymer melt. 

 

 

cpf 100 system

DESIGN CRITERIA:

 

  • System Pressure: to 345 bar
  • System Temperature: to 330 ̊ C
  • Differential Pressure: to 210 bar depending on element configuration
  • Heating: liquid, vapor or electric

 

CONNECTIONS:

 

  • Process: Butt weld standard; Clamp or flange style available.
  • Heating: Butt weld standard. Flange style available.

 

MATERIALS OF CONSTRUCTION:

 

  • Valve Bodies: Type  304 stainless steel
  • Filter Housings: Type 17-4 PH stainless steel
  • Seats &Gaskets: Aluminum
  • Packings:RYTON® standard (others are available)
  • Heat Exchanger: Carbon steel, double wall construction (liquid or vapor) Aluminum (electric)
  • Insulation: High temperature fiberglass blanket with non-stick outer covering standard (stainless steel cover available)

 

 

 

200 Series CPF System - For applications with special requirements and/or hIgh flow rates.

 

 

Our CPF Model 200 series are large, vertical systems designed for applications with special requirements and/or high flow rates. They are available configured for manual operation, or in fully automated, computer-controlled designs. With the complete computer-controlled valve package, the Model 200 ensures consistently smooth, “bumpless” changeovers, and significantly reduces operator error and safety risks.

 

In Model 200 CPF systems, the filter housing and heat exchanger together form a simple, self-aligning mechanism that enables the removal and installation of the filter housing in less than 30 minutes. Similar to the 100 series, only 6 bolts are required for installation/uninstallation. Since no process connections are broken and handling fixtures are incorporated into the design, exchanging a clean filter bundle for a dirty one is simple and efficient and can be done while the parallel housing continues to process and filter the polymer melt. 

 

 

200 series cpf system

DESIGN CRITERIA:

 

  • System Pressure: to 345 bar
  • System Temperature: to 330 ̊ C
  • Differential Pressure: to 210 bar depending on element configuration
  • Heating: liquid, vapor or electric

 

CONNECTIONS:

 

  • Process: Butt weld standard; Clamp or flange style available.
  • Heating: Butt weld standard. Flange style available.  Complete heating manifolds available.

 

MATERIALS OF CONSTRUCTION:

 

  • Valve Bodies: Type  Type 17-4 or 304 stainless steel
  • Filter Housings: Type 17-4  or 304 stainless steel
  • Seats:Aluminum
  • Housing Seals: Stainless steel o-ring
  • Packings:RYTON® standard (others are available)
  • Heat Exchanger:  Carbon steel, double wall construction (liquid or vapor) Aluminum (electric)
  • Insulation: High temperature fiberglass blanket with non-stick outer covering standard (stainless steel cover available)

 

 

 

Diverter Valve

 

 

 

diverter valve

One of the most important aspects to a continuous filtration system is the diverter valve.  It is important that they be design specially for polymer melt applications and that they focus on a bumpless and transparent changeover.  Pall systems incorporate specially designed spool type diverter valves, known for their exceptional dependability and reliability. The pressure balanced spool design operates smoothly and consistently with minimal force.

 

Through use of state-of-the art Computational Fluid Dynamics (CFD) analysis, Pall has developed a contoured spool valve that optimizes the flow path of the polymer through the valve.  This valve eliminates low flow areas where polymer can easily hang up.  The spool geometry creates a unique flow path which results in optimal residence time distribution and smooth flow of polymer through the valve. Contact us to learn more about how this valve can drive end product quality.  

Pilot Systems

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We understand that sometimes customers have needs outside of buying full-sized systems for high-throughput lines.  Therefore, we designed a single element housing made specially for pilot, R&D, and lab scale sized jobs.  This pilot polymer filter system is designed to accommodate 10 inch (25.4 cm), 20 inch (50.8 cm), and 35 inch (88.9 cm) length elements.  Housing ares constructed of 316L stainless steel for strength, compatibility, and corrosion resistance.

 

They can fit both fan and Ultipleat Plus candles and have a straight through design.  The quick connect/disconnect fittings allow for easy install and removal and the vent fittings and ports for pressure & temperature measurements assist in process development.  Custom designs are available too - contact one of our experts to learn more about getting the right single metal element filter housing for you.

Let’s find the right solution, together.

Let’s connect. We want to share our innovative filtration solutions with you today. Contact our knowledgeable subject matter experts for information on how we can help. Thank you and we look forward to assisting you shortly.

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