Liquid Bag Filter Products

Process Engineering & Equipment Co.

A cooling system filter manufactured by Process Engineering & Equipment Company will provide 100% filtration of your circulated cooling tower or process water. Particulates no larger than the element you specify will be allowed to pass the filter to plug or contaminate your system. A typical liquid bag filter package will consist of 2 to 10 number 2 size bag filters, mounted on appropriately sized inlet and outlet headers with isolation valves for each housing.  Liquid bag filters can be serviced on-line by isolating one liquid bag filter housing at a time. Liquid filter bags can be throw-away or cleanable (your preference).

Our liquid bag filters package uses a Rosedale Model 8 standard #2 filter bag. At P.E.C.O. we stock a large inventory of these liquid bag filters in SS304 and carbon steel for quick delivery or prompt assembly of any custom liquid bag filters needed.

Rosedale

Rosedale is a leader in the liquid filtration industry. With more than 50 years of experience, we have the filters for your filtration needs.

  • Single Bag Liquid Bag Filter Housings
  • Multi-Bag Liquid Bag Filter Housings
  • Polypropylene Liquid Bag Filter Housings
  • Indicating Filter
  • Centrifugal Separators
  • Backwashing Systems
  • Coolant Filter Systems
  • High Capacity Elements
  • Filter Bags

Rosedale Filter Housings come in many sizes and styles, and all serve as liquid bag filters, cartridge filters or basket strainers. Housing covers are easily removed without special tools, and the element is easily cleaned or replaced.

Features

  • Single, multi-basket, cartridge, duplex and multiplex units available
  • Low pressure drops
  • Permanently piped housings
  • Sure-sealing covers, opened without special tools
  • Carbon steel, stainless steel (304 or 316), or all-plastic (polypropylene) construction
  • Large-area, heavy-duty baskets or cartridge internals
  • Easy to clean liquid bag filters!
  • Adjustable-height legs (single units) or low profile (multi-units)
  • Differential pressure indicators (optional)
  • ASME code stamp available
  • Liquid displacers that minimize product loss basket or bag removal (optional)
  • Dual stage straining/filtering (optional)

Multi-Basket Liquid Bag Filters offer a wide range of flow capacities and contaminant-holding capabilities. They contain 2 to 23 same-size baskets and can handle flows from 400 to 4500 gpm. Multi-cartridge housings contain 2-205 cartridges.

Eaton-Ronningen Petter

Mechanically Cleaned Filters

In 1991, we introduced the Ronningen-Petter family of mechanically cleaned filters. Designed to address the challenges of increasing environmental pressures, loss of valuable product, and operator safety, the DCF was like no other filtration system. 

Ronningen-Petter mechanically cleaned filters are based on a simple concept:  A cylindrical stainless steel housing contains a filter screen; unfiltered liquids enter the inlet; solids are deposited on the interior surface of the filtration media; and filtered fluid exits at the outlet. 

When the media requires cleaning (based on time, pressure differential, or manual selection), a cleaning disc travels down and up the screen, removing concentrated solids. This cleaning process happens while the filter remains in service, thereby maintaining process efficiency and dramatically reducing loss of valuable product.

Tubular Backwashing Filters

The Ronningen-Petter tubular filter is an in-line pressure filter with reusable elements. It protects both product and process by removing contaminants from a variety of liquids.

Single Filters are offered in several models with flow rates up to 250 gpm.

Duo filters consist of two-single filter units connected in parallel to 3-way valves. Duo filters are usually rated for the same flow as Single Filters. That’s because in most applications one filter unit is valved offstream for cleaning while the other continues filtering. 

Multiplex filters consist of two or more single filter units valved in parallel to common headers. Multiplex Filters can handle continuous flow rates to 5,000 gpm and higher.

Four media types with filtration levels from 10 mesh to nominal 1 micron provide a wide particle-removal range.

Here’s How It Works

Unfiltered liquid enters the inlet (bottom) port. It flows upward, around, and through the media, which is a stainless steel or fabric screen reinforced by a perforated, stainless steel backing. Filtered liquid discharges through the outlet (top) port. Because of the outside-to-inside flow path, solids collect on the outside of the element so screens are easy to clean.

Media Filters (Sand Filters)

Pep Media Filters operate using a proprietary media sieved and polished to provide consistent, accurate particulate removal from a flow source. While PEP manufactures several designs of media filters, the primary method of operation is very similar. Liquid enters the vessel over the top of the media, flows down and through the media bed, and out an underdrain system. While the systems can be manual, PEP’s forte is automated, self-cleaning, pre-packaged, skid-mounted filtration systems.

As the liquid travels through the media, contaminants are trapped between the individual beads of media. The media is specifically selected to provide reliable, consistent levels of particulate removal. As the void spaces are filled with diret, the pressure differential across the media increases. Once the differential pressure teaches a preset level, a backwash is initiated. The valves reverse themselves, and flow enters below the media flow upward and out of the vessel, taking trapped contaminant with it and to the drain. The backwash duration depends on the type of filter in operation. When the backwash is complete, the valves move back to the forward flow (filtration) mode.

  • Flows from 17 gpm
  • Pressures to 600 psi
  • Fiberglass, carbon steel, or stainless steel construction
  • ASME code vessels available
  • Variety of coatings available
  • UL panels standard
  • Skid-mounted single point utility connections
  • Filtration as low as 0.5 micron

DISC FILTERS

PEP’s Filters Operate using a specially designed disc filtration technology. Thin, color-coded polypropylene discs are diagonally grooved on both sides to a specific micron size. A series of these discs is then stacked and compressed on a specially designed spine.

When stacked, the grove on the tops runs opposite to the groove below, creating a filtration element with a statistically significant series of valleys and traps for solids. The stack is enclosed in corrosion and pressure resistant housing. During the filtration process, the filtration discs are tightly compressed together by the spring’s power ant he differential pressure, thus providing high filtration efficiency. Filtration occurs while water is percolating from the peripheral end to the core of the element. Depending on the micron rating, there are 18 (in 400 micron discs) to 32 (in 20 micron discs) stopping points in each track, thus creating the unique in-depth filtration. It is a fully automatic filtration system, which means that the filtration process starts once the flow of source water to the system begins, and provides a continuous supply of clean water.

ADVANTAGES

  • Filtration of solids and impurities is reliable, accurate and efficient
  • Innovative filter design, which can store larger amounts of solids, reduces need for backwashing
  • Short flushing duration minimizes flush water consumption
  • Regulated flush water volume for efficient backwash and water consumption
  • Operation is easy and automated, and requires no special tools
  • Automatic cleansing of filter element during each backwashing eliminates the need for labor-intensive, expensive, element replacement
  • Uninterrupted water supply during backwashing