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.
