Cartridges

TECHNI FILTRATION SPRL

Le Spécialiste en Filtration Industrielle

Cartridges Process liquid /solid

There is a very large range of filter cartridges.

The choice of it is determined by a successive elimination according to the operating conditions and the results. .

- Depth filters

- Pleated filters

Depth filters are available in absolute or nominal pore size. The proposed micro ratings are from 200 µm till 0.5 µm. The materials of construction of Depth filters are polypropylene, nylon and polyester .

Pleated cartridges are also available so well in absolute or nominal pore size from 100 to 0.05 µm, these last one call pleated membranes . The available constructions materials are vast and numerous as polypropylene, polysulfone, nylon, glasswool , PVDF ....

Standard dimensions are for the length 10, 20, 30 or 40" and with a diameter of 2.5" . Other less common sizes are also available.

The proposed end connections adapt to any filter housing and therefore the interchangeability is assured.

Depth filters are generally made of polypropylene. Polyamide or polyester can also be used for improved chemical resistance to certain organic products. Filtration is always done from the outside to the inside.

How the depth cartridge is manufactured plays an important rol on the performance, especially for the capacity of retention, the permeability and the cut off.

The particles are filtered through the depth of the media. The larger particles on the outside and the tinner near the inner diameter. The quality of the cartridge is of course playing well a big part in this repartition.

The standard outside diameter of the cartridge is 2.5". There are exceptions such as the High-Flow cartridges that can handle a very large flow with a retention capacity 60 times greater than normal cartridges.

The other major category of cartridges are the pleated cartridges. Filtration here is made on the area of the pleated media and not on the depth.

The pleated media may be a monofilament or a membrane. The materials are varied : Polyethersulfone, nylon, polypropylene, .The pleated media is maintained by a cage.

Pressure drop curve of a blank depth cartridge for different micro rating .

Pressure drop curve of a blank pleated cartridge for different micro rating. The curves change obviously with the saturation of media. Thez are therefore stiffer than those show above.

The red curves represents the effectiveness of a 10 µm absolute cartridge. In yellow, a nominal 10 µm with 90 % of efficiency and in green a 10 µm nominal with 80 % efficiency.

To avoid bypass there are flat seals or caps with O-rings

Above pictures of different end caps available.

Above a summary of the ordering information.

Stainless steel cartridges

Stainless steel cartridges are also process cartridges. They are used where the polymer medium can not agree as for :

- Filtration of very viscous product

- High temperature filtration

- Steam filtration

- Filtration of products chemically incompatible with polymers

- etc, ...

Below are 4 types of the most experienced stainless media :

2. The cartridge above is made by using a stainless steel filter cloth supported on the inside by a metal support to counteract the significant pressure drop during filtration of a viscous liquid

The above cartridges are similar to the previous one except that the gauze filter is pleated and is providing a larger filter area.

4. The media cartridge above is made from stainless steel sintered pellets . The filtration in this case is also on the depth of medium unlike previous cartridges with gauze .

The media here is manufactured from stainless steel sintered fibers that forms a king of metal flet which is then narrows to make the cartridge. The media is supported by an outer cage for the filtration of viscous liquids

Air cartridges

There are different types of cartridges for air filtration. Here are the main ones :

- Cartridges with PTFE membranes for venting tanks

- Stainless steel cartridges for steam filtration

- Cartridges for compressed air

- Cartridges for air induction

Note that some cartridges can filter liquids as well as gas. In this case the cut off is 10 times smaller for gases than for liquids.

Vented cartridge with a pleated hydrophobic PTFE membrane for air sterilisation. The cut off is typically 0.2 µm

Sintered stainless steel cartridge for steam filtration.

Cartridges for compressed air. The media's are varied because there are different steps before sterile filtration on a PTFE membrane. The endconnections and a stainless steel frame allow a steam sterilisation of the cartridges.

This type of cartridges are often used to protect the compressor. The media is generally in cellulose fiber (paper).

Activated carbon cartridges

Cartridges with activated carbon allow to deodorize and also the decolour water.

They consist of an activated carbon sintered block with a very large area to absorb the contaminants.

This last one is protected by a layer of polypropylene pre-filtration.

Hydraulic cartridges

Hydraulic cartridges are used for filtering the oil of hydraulic systems