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Case Studies
» Oxford Filtration Wedge Wire Laterals
» Chemical Cleaning: Filtration for Submarines
» Installation of New Self Cleaning Filters at Pulp and Paper Mill in Portugal
Oxford Filtration 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
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.