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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
 
  ABRASION
  Migration of foreign material which enters the fluid stream fom system components that wear from closed tolerances, vibration or shock.
   
  ABRASION RESISTANCE
  Ability of a fiber or fabric to withstand surface wear.
   
  ABRASION - SURFACE
  Fabric wear on the surface created by particulate erosion, rubbing or scuffing.
   
  ABSOLUTE PRESSURE
 
The pressure above an absolute vacuum. One atmosphere (14.70 psi) greater than gauge pressure. Symbolized as psia when the pressure is expressed in psi units.
   
  ABSOLUTE RATING
  An term used to describe or define the degree of filtration.
Various methods are used to determine absolute ratings which are not necessarily interchangeable. Generally absolute means 100% removal of solids above a specified micron size.
   
  ACIDITY
  The quantitative capacity of aqueous solutions to react with alkalis.
   
  ACID DEW POINT
  The temperature at which liquid droplets which are acidic condense from the vapor phase.
   
  ACID GAS SCRUBBER
  Process equipment where an alkaline solution is introduced into the gas stream in a finely atomized spray. It reacts with gas stream constituents to be scrubbed, creating neutralized particles that have absorbed acids and can be collected.
   
  ACFM
  Actual Cubic Feet per Minute. The volume of the gas flowing per minute at the operating temperature, pressure and composition.
   
  ACRYLIC
  Any of a group of synthetic fibers derived from a compound of hydrogen, cyanide, and acetylene, and made into fabrics.
   
  ACTIVATED CARBON
  Any form of carbon characterized by high adsorptive capacity for gases, vapors, or colloidal solids. The carbon or charcoal is produced by destructive distillation of wood, peat lignite, nut shell, bones, vegetable or other carbonaceous matter, but must be activated by high temperature steam or carbon dioxide which creates a porous particle structure.
   
  ADHESIVES
  Used in the essential bonding process between cylinders of pleated filter paper and end caps in paper filter element production.
   
  ADSORPTION
  The attraction and/ or the retention of particles by molecular attraction or electrostatic forces present between the particles and a filter medium. Also, the attraction of gasses, liquids or solids to surface areas of textile fibers, yarns, fabrics, or any similar type of material.
   
  AEROSOL
  A dispersion of small liquid particles in a gas.
   
  AFFLUENT
  Fluid entering the filter or filter system. Commonly described as influent, it is the opposite of effluent.
   
  AGGLOMERATION, PARTICLE
  Multiple particles joining or clustering together by surface tension to form larger particles, usually held by moisture, static charge or particle architecture.
   
  AIR-TO-CLOTH RATIO
  The ratio between ACFM flowing through a filter and the square feet of filter area available. This can also be thought of as the velocity of the gas passing through the filter in feet per minute (FPM).
Note: In the metric system the term used is “filtration velocity” (instead of “air to cloth ratio”; defined as the relation between the m3/min. of air flowing through a filter and the m2 of filter area available.
   
  ALKALI
  A term that applies to the type of compounds which have basic properties and which will neutralize acids. Some alkaline materials are hydroxides, carbonates,etc.
   
  ALKALINITY
  The quantitative capacity of aqueous solutions to react with acids.
   
  ANEMOMETER
  A device for measuring small air velocities. See hot-wire anemometer and rotating vane anemometer.
   
  ANTI-COLLASPE RINGS
  Small diameter metal rings that surround a reverse air bag.
They are kept in place by an outer covering of fabric that is sewn to the bag. These prevent flattening (sometimes termed pancaking) of the bag during cleaning.
   
  ANTI-SNEAK BAFFLES
  A gas distribution device in which internal baffle elements within the precipitator prevent the gas from bypassing the active field or causing hopper re-entrainment.
   
  APPROACH VELOCITY
  The inlet (unfiltered) gas stream velocity as it passes around the bottoms of the filter elements to approach the filter media surfaces in pulse jet and cartridge filtration systems. The approach velocity is determined by the air-to-cloth ratio, the filter element spacing, and the filter element height. Also referred to as can velocity.
   
  AREA
  The available apparent surface exposed to the flow of a fluid for maximum utilization. Function of area in filtration is related to initial pressure drop, rate of flow, and solids retention capacity.
   
  ATMOSPHERIC PRESSURE
  The pressure of approxinmately 14.7 pounds per square inch (psi) exerted at sea level in all directions by the atmosphere.
   
  AVOGADRO’S LAW
  The law which states that under the same conditions of pressure and temperature, equal volumes of all gases contain equal numbers of molecules.
   
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