"To filter or not to filter?" That is the question - or is it? The real question we need to ask ourselves is, what type of filtration do we need? In today's engineering climate, most of us will have to learn something about filtration. Most engineers do not spend a great deal of time learning about a subject unless there is an immediate application. Therefore, the fundamentals of filtration technology is here introduced in a quick and simple manner. The proceeding discussion is very basic. Filtration theory, terminology, test standards, classification and selection are outlined and explained. This information provides a solid basis of knowledge from which an engineer can make sound decisions regarding filter selection and application in most engineering projects. Filtration applications The reasons for using filtration technology are many. In some cases, filters are used to purify the product. In others, they are used to clean auxiliary fluids. Cleaner fluids can also extend equipment life by reducing erosion. Below, is a short list of examples. Increase pump, bearing, and tool life (cutting and grinding coolants) Keep valves from sticking Prevent nozzles from plugging Increase product yields (semiconductor IC manufacturing) Provide clearer cleaner products (high purity solvents, RO pre-filtration, potable liquids, edible Oil) Remove agglomerates for smoother coatings (inks, paints, and varnishes) Remove bacteria to prevent spoilage (wine, beer) Protect strata from wells (secondary oil recovery) Remove harmful by-products ( heavy metals as hydroxides, pyrogen removal) Recover precious metals Recycle fluids as much as possible to reduce disposal costs. Source: fischer-robertson.com
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