|ABSOLUTE RATING - The size of
microns of the largest spherical particle that will pass through the element.
Submicron particles suspended in air, gas or
vapor. A fog, fume, or smoke.
ALKYLATION - A
gasoline refining process.
AQUEOUS CONTAMINATE -
AREA - The surface exposed to the flow of a fluid.
BAR - A unit of pressure
One (1)bar = 14.5 PSI.
BETA RATIO - The ratio of the number of
particles greater than a specified micrometer in the influent fluid to the number of
particles larger than the specified micrometer in the effluent fluid.
BUBBLE POINT - The
differential gas pressure which when applied to a filter element submerged near the
surface of a test fluid causes the first steady emission of gas bubbles from the filter
BULK DENSITY - Ratio of
total mass or weight of the material divided by the volume of the
BUNA N - a
Nitrile rubber seal compound. This is a generic term covering many formulations.
CENTIPOISE - A unit of
absolute viscosity. One centipoise equals .01 poise.
CENTISTOKE - A unit of kinematic viscosity. One centistoke equals .01 stoke.
PRESSURE - The minimum differential pressure that a filter element
is designed to withstand without permanent deformation.
CONTINUOUS PHASE - The
basic product flowing through a filter or filter/separator which
continues on through a system after being subjected to solids and/or
CYCLE - Filtration interval; length of
time filter operates before cleaning.
DEGREE OF FILTRATION - A measure of the
effiency of a filter element. Expressed in terms of percentage retention of standard
contaminants, under defined test conditions (NOMINAL RATING); and the size in microns of
the largest hard spherical particle that will pass through the filter element (ABSOLUTE
DELTA (D) P - Pressure drop.
DIFFERENTIAL PRESSURE - The difference in
pressure between two points in a fluid system usually in filtration systems expressed as P
between a housing inlet and outlet.
DISCONTINUOUS PHASE -
The phase dispersed in the
continuous phase; water is a discontinuous phase to be separated from a
hydrocarbon liquid or from air or gas.
DISPOSABLE FILTER ELEMENT - A filter
element which is not recleanable and is therefore discarded and replaced at the end of its
useful life. (Sometimes referred to as throwaway or non-cleanable element).
The quantity of liquid which
makes up one spherical mass; a liquid globule.
A minute drop which may coalesce to
EFFECTIVE FILTRATION AREA - That area of
the fluid medium in a filter element which is exposed to flow.
EFFICIENCY - The ability of a filter
element to remove/retain a specific artifical contaminant in a specified concentration
under controlled test conditions. Efficiency is expressed in percent.
Stream of fluid at the outlet of a
filter or filter/separator. Opposite of influent.
A dispersion of fine droplets in
the continuous phase.
ENTRAINED WATER -
Discrete water droplets carried by
a continuous hydrocarbon phase.
FIBER MIGRATION -
Carry-over of fibers from filter or
separator media material into the effluent. Fiber migration is a
qualitative part of total media migration.
FILTER ELEMENT - A porous device which
performs the actual filtration process.
FILTER MEDIA - The porous structure upon
which, or in which, fluid system contaminants are trapped.
The fluid which has passed through
filtering media. Also referred to as effluent from filters.
FLOW FATIGUE RESISTANCE - The ability of a
filter medium to resist structural failure or deterioration from cyclic loading.
GPH - Gallons per hour.
GPM - Gallons per minute.
GRAVITY SEPARATION -
Separation of immiscible phases
resulting from a difference in specific gravity (Settling).
Water accepting or water wettable.
Opposite of hydrophobic.
Not-water wettable. Opposite of
Liquids which are mutually
insoluble; opposite of miscible.
Stream of fluid at the inlet of a
filter or filter/separator. Opposite of effluent.
INLINE TYPE FILTER - A filter assembly
whose inlet, outlet, and filter element have a common centerline.
MEDIA MIGRATION -
Carry-over of fibers and particles
from filter or separator media material into the effluent. Includes
fiber migration measured in milligrams per liter.
MEDIUM - The porous material that performs
the actual process of filtration.
MICROMETER OR MICRON - A unit of length. A
micrometer is one millionth of a meter or 0.000039" (39 millionths of an inch).
Expressed in convenient terms 25 micrometers are approximately equal to one thousandth of
an inch (.001").
Liquids which are mutually soluble.
Opposite of immiscible.
MULTI-PASS TEST - A test used to determine
the Beta Ratio of a filter element.
NOMINAL FILTRATION RATING - An arbitary
micrometer value established by a filter manufacturer as a relative indication of aveage
PERMEABILITY - The relationship of flow
per unit area to differential pressure across a filter medium.
PHOSPHATE ESTER BASE FLUIDS - Fire-resistant
PRESSURE DROP -
The difference in pressure between two points, generally at the inlet
and outlet of a filter or a filter/separator. Measured in pounds per
square inch, inches of mercury, kilograms per square centimeter, or bars
(1 bar = 14.5 psi).
PSID (P) - Pounds per square inch
PSIG - Pounds per square
inch gauge = PSIA minus atmospheric pressure (14.696).
RATED FLOW - The optimum flow rate for
which a filter is designed.
SAYBOLT SECONDS UNIVERSAL - (SSU) A measure of viscosity. The time in seconds for 60 cubic centimeters (cc) of oil to flow through a standard orifice at a specific
SPECIFIC GRAVITY -
The ratio of weight
of any volume of a substance to the weight of an equal volume of
standard substance; i.e. water for solids and liquids, and air of
hydrogen for gases.
STATIC GENERATION -
Unbalanced or net electrical charge
produced in a following hydrocarbon liquid.
Surface-active agents, which are
also called detergents, emulsifiers, or wetting agents. Polar compounds.
A filter/separator containing two kinds or types of replaceable
The time rate of motion or speed in
a given direction.
VISCOSITY - A measure of the internal
friction or the resistance of a fluid to flow. The standard unit of measure is poise or