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Filtration Glossary
 
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  FABRIC FINISH
  Top coating on fabric to assist in the filtering operation.
   
  FABRIC FOLDER
  A metal device used to fold moving fabric to a given shape automatically. Also prepositions the fabric.
   
  FACE VELOCITY
  The gas flow rate expressed in actual cubic feet per minute (ACFM) divided by the area of the filter element. For example, a 20 square foot filter element processing 2000 ACFM would have a face velocity of 100 feet per minute.
   
  Feed
  The raw supply liquid to the filtration unit.
   
  FIBER
  Type and/or grade of fibers used in media.
   
  FILTER
  A term generally applied to a device used to remove solid contaminate from a liquid or gas, or separate one liquid from another liquid or gas. A filter, as referred to in the industry today, is limited to a device which removes solid contaminates only. A filter may be one of a number of such types as replaceable cartridge, cyclone, edge, leaf, baffle, plate and frame, precoat, centrifuge. The term filter is sometimes erroneously used to describe the media used inside the vessel or filter case, but the correct use should be filter element, cartridge etc.
   
  FILTERABILITY
  The case of difficulty of filtering.
   
  FILTER AID
  Any material that assists in the separation of solids from liquids. Usually used on difficult filter applications.
   
  FILTER CAKE
  Solids deposited on the filter media.
   
  FILTER DRAG
  The ratio of differential pressure across the filters to velocity through the filters.
   
  FILTER EFFECT
  Gradual increase of filter resistance.
   
  FILTER EFFICIENCY
  A measurement of how well a filter retians particles. Usually expressed as a percentage of retention of particles of a specific size by a filter.
   
  FILTER ELEMENT LIFE
  The span of operation from clean unit to a predetermined pressure drop build up, usually measured in elapsed time elapsed time. Typically 2-4 times if initial required to cause differential pressure or 50-80% drop in initial flow or the downs stream measure of unacceptable particulate.
   
  FILTER MEDIUM
  The porpous material mounted on a plate or frame which separates the solids from the liquids in filtering. Also referred to as filter cloth, filter plate or septum. The material that performs the actual process of filtration.
   
  FILTER MONITOR
  Water absorbent filter element which will continuously remove dirt and water from aviation fuel.
   
  FILTER PAPER
  A permeable web of randomly oriented fibers, generally cellulose (i.e., wood pulp, cotton) or glass fiber is formed from water draining from a carefully prepared suspension of these fibers fed to a continuously traveling, endless belt of wire mesh- a paper making machine. Various grades are available and also with resin addition to give strength to the paper when wet. A wide range of filter papers is available commercially for the removal of particles from liquids and gases.
   
  FILTER PLATE
  The porous material mounted on a plate or frame which separates the solids from the liquids in filtering. Also referred to as filter cloth, filter medium or septum.
   
  FILTER SEPARATOR
  A filter separator usually has two compartments. The first compartment contains filter-coalescing elements. The second compartment contains a vane type of knitted wire mesh mist extractor. A lower barrel of boot may be used for surge of storage of the removed liquid.
   
  FILTRATE
  The liquid which has passed through the filter; the fluid that has been separated from the solids in the slurry being filtered. Also referred to as discharge liquor, effluent, mother liquor, solute or strong liquor.The end product of the filtration process; i.e., liquid exiting the filtrate outlet.
   
  FILTRATE FLUX
  The rate of filtrate flow as expressed per unit of filtration area (liters/meter sq. hour).
   
  FILTRATE SHUT-OFF VALVE
  The device used to isolate filtrate flow from a single module. It is a built-in feature of the Memcor® M10 class module.
   
  FILTRATE SIDE
  That part of a system which carries filtrate flow, including fiber lumens and all filtratecarrying manifolds and pipework. Same as Lumen Side.
   
  FILTRATION
  Removal of particles, normally solids, from a fluid. These can be contaminants or valuable products.
   
  FILTRATION BETA RATIO
  The ratio of number of particles greater than a given size (n) in the influent to the number of particles greater than size (n) in effluent fluid.
   
  FILTRATION EFFICIENCY
  A filters ability to remove particles of the specified size, expressed as a percentage or as a Beta Ratio.
   
  FILTRATION RATE
  The volume of liquid that passes through a given area in a specified time. Usually expressed as gallons per square foot per minute (or hour).
   
  FILTRATION RATING
  The diameter of the largest hard spherical particle will pass through a filter under specified test conditions. This is an indication of the largest opening in the filter medium.
   
  FLASH TANK
  A vessel used to separate the gas evolved from liquid flashed from a higher pressure to a lower pressure.
   
  FLEX
  The movement of filter media primarily during the cleaning cycles can lead to long term damage due to fiber-to-fiber abrasion. Also, new filter bags can be flexed (bent) by rough treatment during shipping and installation.
   
  FLOW DECAY
  Decrease in flow rate as a result of filter plugging or clogging.
   
  FLOW DECAY TEST
  An experiment to determine flow rate and throughput of a filter type or combination of filters on a specific liquid, usually bu using a small area filters, to determine the sizing of a filter system by extrapolation.
   
  FLOW RATE
  The speed at which a liquid flows and is measured in gallons or liters per minute. Flow rate of a liquid can be affected by the liquids’ viscosity, differential pressure, temperature, and type of filter used.
   
  FILTER RESISTANCE
  Resistance offered by filter medium to fluid flow; the pressure difference required to give unit flow of a fluid of unit viscosity through a unit cube of filter medium.
   
  FOG
  Condensed water, hydrocarbon, or other liquids which are visible to the naked eye.
   
  FUEL- GARD
  Trade name for a small, compact two-stage filter separator for use on liquid/ liquid separation. Permits the use of highly efficient medium developed for large industrial applications on low flow rates.
   
  FUMES
  Small solid particles formed by the condensation of vapors of solid materials.
   
   
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