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Filtration Glossary
 
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  PACKED BED
  Discrete materials such as sand, graval, anthracite, fabricated rings or saddles, assembled in a confined space as filtration medium for liquids or gases.
   
  PAPER
  Medium used in many elements. A very general term applied to resin impregnated cellulose. Many types of paper or cellulose, made to specification, are used as a filter medium.
   
  PARALLEL FILTRATION
  Branching a filtration setup so that two assemblies of the same pore size are in parallel, to increase flow rate or simplify filter changes.
   
  PARTICLE
  Any discrete unit of material structure: a discernible mass having an observable length, width, thickness, size, and shape.
   
  PARTICLE SIZE DISTRIBUTION
  The size range and quantity of particles which are measurable in a dry or liquid sample. Used to determine the appropriate filter media for a specific process.
   
  PARTICULATE
  Any solid or liquid material in the atmosphere.
   
  PART NUMBER
  A number used to describe a unique item. Each filter, filter support and accessory item has its own part number.
   
  PERFORATED
  Material in which holes have been punched, such as the material used to make the center tube of a cartridge.
   
  PERMEATE
  The product, or filtrate, of Reverse Osmosis or ultrafiltration.
   
  PH
  A value of indicating the acidity or alkalinity of a material. A pH of 7.0 is neutral, less than 7.0 is acidic, and more than 7.0 is basic.
   
  PLEATED
  A filter element whose medium consists of a series of uniform folds and has the geometric shape of cylinder, cone, disc, plate, etc.
   
  PLEAT SUPPORT/ SPACERS
  Used to prevent the collapse of pleats in a pleated paper or membrane cartridge when under the action of differential pressure.
   
  PLUGGED
  The condition of a filter when it has collected its full capacity of contaminants and will not pass any more fluid.
   
  PM10
  A US EPA standard that includes additional controls on particulates sized 10 micron and smaller.
   
  PM2.5
  A US EPA standard that includes additional controls on particulates sized 2.5 micron and smaller.
   
  POLYESTER
  Any of several polymeric resins formed chiefly by condensing polyhydric alcohol’s with dibasic acids. Fibers formed
   
  POLYPROPYLENE
  Polymerized polypropylene thermoplastic resin used primarily as a coating.
   
  PORE
  Small interconnecting passage through a membrane. The size and irregular path of a pore determines the removal efficiency of a membrane.
   
  PORES
  A term used to describe the openings in a filter material normally a membrane. Small interconnecting passage through the membrane. The size and irregular path of a pore determines the removal rating of a membrane.
   
  PORE SIZE
  The equivalent diameter of the smallest part of any channel through a membrane.
   
  PORE SIZE-ABSOLUTE RATING
  The rated pore size of filter at which particles equal or larger than the rated pore size are retained with 100% efficiency
   
  PORE SIZE-NOMINAL RATING
  The pore size at which a particle of defined size will be retained with efficiency below 100% (typically 90-98%). Rating methods vary widely between manufacturers.
   
  POROSITY
  The percent of open areas per unit volume of fabric. -A term used to describe a filter materials structure - sometimes known as a void volume.
   
  POTABLE
  Drinkable (water).
   
  PPM
  Parts per million. A unit of concentration; e.g., 3 ppm would be 3 pounds of solids in 1,000,000 pounds of water.
   
  PRE-COAT
  A deposit of material (usually inert), such as filter aid on a septum prior to beginning filtration.
   
  PRE-FILTER
  A device installed upstream of the main filtration process to remove large solids.
   
  PRE-FILTRATION
  Removal of coarse particles/ contaminants prior to final normally finer filtration.
   
  PRESSURE
  An increase in the force exerted on something above standard atmospheric conditions, measured as gauge pressure (psig, bar g).
   
  PRESSURE, ABSOLUTE
  Gauge pressure plus 14.7 psi (1 bar).
   
  PRESSURE, ATMOSPHERIC
  The force exerted by the atmosphere at sea level which is equivalent to 14.7 psi (1 bar).
   
  PRESSURE DROP
  A measure of the resistance the gas stream encounters as it flows through the baghouse. May refer to pressure differential across the cloth, across the baghouse, or the pressure drop across the entire system.
   
  PRESSURE DROP, CLEAN
  Differential pressure (drop) across a housing at rated flow on new elements with clean product.
   
  PRE-TREATMENT
  The chemical or physical action of cleaning up a fluid prior to final treatment or filtration.
   
  PROCESS FILTRATION
  Filtration used as an active part of producing finished products.
   
  PSI
  Pounds per Square Inch; a unit of pressure; 1 psi equals 27.7” water gauge or 2.04” mercury (Hg).
   
  PTFE
  Polytetraflouroethylene. Highly durable and resistant to a broad range of temperatures and chemicals. Used to form a heat-bonded, expanded membrane on filter media to provide high efficiency among other properties. PTFE is hydrophobic.
   
  PURIFICATION
  Removal of water of hydrocarbon in vapor from an air or gas stream. Differs from entrainment removal in that the dew point of a gas stream will be lowered by vapor removal.
   
   
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