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Filtration Glossary
 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 
  BACK PRESSURE
  A backward surge of pressure from downstream to upstream of the filter. Can be the result of closing a valve or air entrapped in a liquid system.
   
  BACK WASH
  Reversed flow through a filtration media, as an attempt to clean or “regenerate” a filter.
   
  BAFFLE
  Component of a housing which constitutes a stage when used; removes liquid and solids by impingement; may be either upstream or downstream of the basic filter medium. May also be a plate to protect filter elements from the velocity of flow into a housing.
   
  BAG-HOUSE
  An air filtration structure utilizing fabric filter bags for the purpose of removing solid particulate from the gas stream; dust collector.
   
  BAG-ON-CAGE
  The concept of selling both the bag and cage as one unit. Normally installed together by the plant.
   
  BAR
  A unit of pressure. One bar = 14.5 psi.
   
  BASKET
  Element for a basket strainer. A device normally using a screen as its medium for removal of coarse bulk solids.
   
  BASKET STRAINER
  A vessel for the removal of coarse bulk solids from liquids, air or gas. The element is usually a steel perforated basket, or a mesh lined basket.
   
  BCP
 
A design code for pressure housing based on the manufacture’s best commercial practice.
   
  BETA RATIO
  The ratio of the number of particles colliding with the filter to the number of particles passed through the filter. Also, an indication of how a filter performs throughout the life of the filter. B10 represents the filtration ratio at 10 micrometers of the ratio of the upstream to downstream particles larger than 10 micrometers.
   
  BLEED THROUGH
  Particulate migration through the interstices of the filter bag fabric.
   
  BLINDING
  Fabric blockage by dust, fume, or liquid not being discharged by the cleaning mechanism, results in a reduced gas flow of increased pressure drop across the filter media.
   
  BLIND SPOTS
  A area of the filter media where no filtration takes place. Also referred to as dead areas.
   
  BLOWDOWN
  The use of pressure to remove liquids and/or solids from a vessel.
   
  BOYLE’S LAW
  If the temperature of a given kind of gas is held constant, the volume of a sample of gas varies inversely with the pressure.
   
  BRIDGING
  material of particulate blockage across an opening, often of a pore or filter medium.
   
  BROWNIAN MOTION
  The continuous zig-zag motion of suspended minuscule particles. The motion is caused by impact of the molecules of the fluid upon the particles.
   
  BRUST PRESURE
  The pressure causing rupture. The inside-out differential pressure that causes outward pressure on the structural of a filter medium, filter or housing.
   
  BUBBLE POINT PRESSURE
  A test to determine the maximum pore size openings of a filter.
   
  BUNA-N
  A synthetic rubber gasket material, used for vessel closures, flanges and filter elements.
   
  BURSTING STRENGTH
  General - A material’s ability to resist rupture by pressure. Specific - Force required to rupture a fabric by distending it with the force applied at right
angles to the fabric plane under specified conditions. Usually expressed in pounds per square inch.
   
  BY-PASS
  A condition that occurs when the filter media is violated and permits unfiltered fluid to pass through.
   
   
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
 
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