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S. Berliner, III's Fluid Filtration Page
Updated: 08 Feb 2001, 21:15 ET
[Ref: This is flfilter.html (URL http://home.att.net/~Berliner-Ultrasonics/flfilter.html)]
FLUID FILTRATION Page
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FLUID FILTRATION
This page was been created (24 Jan 99) to provide a place for comments and queries about
FLUID FILTRATION
.
INTRODUCTION to FLUID FILTRATION
Fluid filters (as opposed to electronic filters, an unrelated field), are porous materials and other means used to remove particulates and other solid and semi-solid contaminants from a fluid. Non-solid contaminants, such as dissolved gases or other materials can not be filtered; they must be removed by absorbtion, adsorption, distillation, and other means beyond the purview of this monograph. Entrained gases (in bubble form) may be removed by modified filter media.
A fluid can be either a gas (air, steam, oxygen, nitrogen, etc.) or a liquid (water, oil, hydraulic fluid, gasoline, etc.).
Porous materials can be cleanable (reusable) or disposable. They can be made of wire mesh or felts or papers or perforated sheets, wound strands, etc.
Reusable mesh or porous metal can be sinter-bonded to prevent movement of fibers or particles relative to one another, thus assuring absolute pore size control and, thus, the flow rate through the medium.
Pore size and shape determines the maximum particle size that can pass the filter. Porous material construction determines the maximum differential pressure which can be imposed upon the medium. Cores and other reinforcements and backup materials placed against the downstream face of the porous medium can enhance the ability to withstand great differntial pressures.
Accessories such as bypass valves and differential pressure indicators and alarms are commonly fitted to filters.
Design philosophies must take into account whether it is better to have fluid flowing at all times, regardless of contamination, or to have flow interrupted rather than allow contaminant downstream of the filter medium.
More to follow - stay tuned.
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