Industrial strainers and filters Simplex and duplex basket strainers Kinney backwash filters

Case Studies

» Collaboration with Major Adhesives Manufacturer

» High Pressure Duplex Basket Strainers

» High Pressure Simplex Basket Strainers

» Oxford Filtration Wedge Wire Laterals

» Chemical Cleaning: Filtration for Submarines

» Installation of New Self Cleaning Filters at Pulp and Paper Mill in Portugal


Collaboration with Major Adhesives Manufacturer
screen for the self clean filter range

As a result of extensive research and development initially carried out in the sugar industry, Oxford Filtration have developed a unique new screen for the self clean filter range which could benefit many niche applications across a wide range of industries.

Once such niche application is in the adhesives manufacturing process where a very accurate determination of filtration level was required. The new media has smooth, circular holes with a sharp edged aperture and a much greater open area than previous systems. In this application, at 250 micron, the open area was more than double the conventional system.

The filter uses a pair of precision stainless steel wiper blades which remove contaminants from the surface of the new screen, keeping the tapered deep hole perforations clean and functioning far more efficiently than other types of element. The unique design of the perforated screen prevents clogging and ensures particulates are removed fully automatically without backwashing.

The self clean filter can be used not only on adhesives and other very thick viscous fluids but on virtually any liquid including water. Oxford’s self clean filters offer significant advantages over older more conventional filter systems such as baskets strainers and bag filters. These advantages include savings in labour costs and improved health & safety of operators as well as much cleaner working environments.

High Pressure Duplex Basket Strainers NEW!
High Pressure Simplex Basket Strainers

Oxford Filtration have recently manufactured a high pressure duplex basket strainer for a blending system in India on a 200 m3/hr mixing loop.

The end user having recently wire brush pigged 1000 km of pipeline dislodged significant amounts of scale which could cause damage to the pump installation. A temporary strainer was installed on the pump suction, but the installation was not designed for regular draining, and this was becoming a big problem for the operators.

Initially it was thought that the customer pipe line would clear this debris but it was decided a DN150 6" class 600 duplex basket strainer rated for 95 Barg design pressure would be required. The unit was fitted with 200 micron stainless steel baskets to remove the scale in the pipeline.

High Pressure Simplex Basket Strainers
High Pressure Simplex Basket Strainers

Manufactured in carbon steel or stainless steel designed for pressure up to 6000 psi they come with a variety of connection styles including SAE and ANSI2500 with declaration of conformity to PED 97/23/EC.

A recent example of their use is on a 6000psi hydraulic water system which operates a 30000 ton and 9000 ton forging press where the strainers are used to protect servo valves from metal particles produced in the forging process.

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Oxford Filtration Wedge Wire Laterals
Wedge Wire Laterals

Self clean filters are proven technology for the automatic filtration of most fluid types including water, oils, resins, adhesives, paint and many others. Often used for the replacement of more traditional labour intensive filtration methods they incorporate most often a wedge wire filter element specially designed and manufactured for this purpose.

However the wedge wire technology is also used on what are known as laterals. Generally the principle of the lateral is to support some type of media or catalyst inside a vessel, and the lateral will then allow flow of a fluid around and through the media, yet retaining the media within the vessel.

Usually the laterals have a slot tube, internal distribution tube with holes along its length, and then the choice of ends can be closure plate usually on one, then either threaded or flanged as shown in (fig 1.)

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Chemical Cleaning: Filtration for Submarines
Chemical Cleaning: Filtration for Submarines

Large nuclear submarines in the UK needed an efficient, fully automated system to strain sea-creatures from their cleaning materials. Oxford Filtration developed a self-clean filter which used specially-designed wiper blades to do the job.

Most large submarines are propelled by means of a nuclear reactor which uses a steam turbine to drive a generator. By removing the requirement for atmospheric oxygen, these submarines can remain submerged indefinitely.

Prolonged submersion, however, could put the vessel in contact with seawater for longer. This in turn could lead to additional contamination issues when chemicals are used to remove organic matter from the submarine's systems.

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Installation of New Self Cleaning Filters at Pulp and Paper Mill in Portugal

A Finnish company Hyxo Oy based in Kerava, Finland recently supplied Oxford Filtration Self Clean Filters to filter sealing water to a Pulp and Paper factory in Cacia Portugal.

Such a factory is nearly always built near to a lake or a river to ensure continuous raw water supply. The water can then be treated in different ways dependent on the final application. At the water station the water is usually mechanically and chemically treated. It is important to have a reliable quality of water at the entry to the plant. The cost of using poor quality raw water for process water use on applications where quality level needs to be good is too expensive at the point of use unless it is adequately cleaned at this initial stage.

At the end of the main inlet pipe is most often installed a coarse pre-screen. The filtration rate is between 10-20 mm. This ensures that no wood parts, plastics bags or other large particle sized debris would enter to the water station.

At the water station will be the final mechanical filtration with Oxford self cleaning units. The filtration rate is normally 100 - 500 µm dependent on the dirt content of water. Humus is the most common debris that should be filtered off before it would enter the factories process water circuit. Self cleaner is installed and "forgotten" as the automation control takes care of the cleaning cycle.

After the mechanical filtration the water can be used for example as cooling water. The filtered water does not anymore consist of humus that would in normal cases clog the heat exchangers surfaces. That will cause less heat exchange power.

The water can also be further treated with sand filters and chemical treatment dependent on the application where the water is used.



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