By Kenneth S Sutherland, George Chase
Filters are utilized in such a lot industries, specially the water, sewage, oil, fuel, foodstuff and beverage, and pharmaceutical industries. the hot variation of this validated name is an all-encompassing sensible account of ordinary filtration apparatus and its purposes. thoroughly revised and rewritten, it really is a vital booklet for the engineer operating in a plant situation-who calls for counsel and knowledge on what is to be had and no matter if it truly is compatible for the activity. Co-published with the establishment of Chemical Engineers.
Co-published with the establishment of Chemical Engineers.
*The top sensible engineering consultant to filtration innovations, platforms and their applications
*Meets the wishes of all key sectors the place filtration is a severe method, together with chemical processing and manufacture, nutrition, oil and gasoline, air-conditioning and water
*A complete sourcebook and reference for plant engineers, technique engineers, plant designers, clear out media and filtration experts and kit specifiers
Read or Download Filters and Filtration Handbook, Fifth Edition PDF
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Additional resources for Filters and Filtration Handbook, Fifth Edition
Surface vs depth ﬁltration It has been stated that a ﬁlter medium is a porous (or at the very least semipermeable) barrier placed across the ﬂow of a suspension to hold back some or all of the suspended material. If this barrier were to be very thin compared with the diameter of the smallest particle to be ﬁltered (and perforated with even sized holes), then all the ﬁltration would take place on the upstream surface of the medium. Any particle smaller than the pore diameter would be swept through the pores, and any particle larger than that (assuming the particles to be rigid) would remain on the upstream surface.
It should be noted that the beta ratio will be different from that determined by this test if it is used in a system that contains particle distributions that differ from the distribution used in the test. Many ﬁlter elements exhibit beta ratios that degrade signiﬁcantly as pressure drops increase. A multi-pass test must therefore be run to a terminal pressure drop that is higher than the operational setting of the dirty element warning device in say a real hydraulic system, to obtain realistic beta ratios for the entire expected life of the ﬁlter.
Energy consumption in operation) and mechanical strength. A weak material, but one with the required ﬁltration performance, can be strengthened by supporting it on a stronger substrate – but at an increase in cost per unit of ﬁltration area. It is not unusual that a ﬁlter medium is over-speciﬁed, and consequently costs more than it need do. As seen in Section 1A, some ﬁlter media are extremely expensive, and there would appear to be little point in purchasing a costly or technologically advanced medium, when there is a well tried, tested and less expensive alternative available.