A U-shaped tube filled
with the specific liquid. The difference in height between
the liquid in each leg of the tube gives directly the
difference in pressure on each leg of the tube. Used
to monitor differential pressure.
MAXIMUM DIFFERENTIAL PRESSURE
The highest pressure differential
which a cartridge is required to withstand without structural
failure or collapse.
MAXIMUM OPERATING PRESSURE
The maximum pressure allowed
in the system.
MAXIMUM OPERATING TEMPERATURE
Continuous operating temperature
at which fabric will perform without deteriorating prematurely.
MEAN EFFICIENCY RATING
A measurement of the average
efficiency of a filter medium using the Multi-Pass Test
where the average filtration (BETA) ratio = 2.0.
MECHANISMS OF FILTRATION
The physical methods of
removing particles from a fluid. They are Direct Interception,
Inertial Impaction and Diffusion. Medium. A term used
to generally describe a filter material.
MEDIA
The filter material through
which air or fluid passes in the process of filtration
and which retains particles.
MEDIA MIGRATION
The carry-over of fibers
from the filter, separator elements or other filter,
in to the effluent. The contaminant or media released
to pass downstream from the filter element.
MEMBRANE
In the filtration industry,
the term is used to describe the media through which
the liquid stream is to passed or exchanged. Membranes
are usually associated with ion exchanged media such
as dialysis, osmosis, diffusion, etc., although filter
paper itself could be classified as a membrane.
MESH
A term referring to a woven
filtration medium, typically wire cloth or monofilament
woven fabric.
MESH COUNT
Number of openings, or
fractions of openings, in a lineral inch of wire cloth.
Where the fractional part of an inch is specified, for
example ½ mesh or ½” mesh, the term
is understood to mean the measurement from the center
of one wire to the center of the adjacent wire. Term
should not be confused with clear openings or scape.
MICROMETER
See MICRON.
MICRON
A unit of length, 1/1000
of one millimeter (1/24,000 of an inch) used as a measurement
of the largest diameter of a particle; 74 microns are
equal to a 200 mesh opening. Usually stated in terms
of being either absolute or nominal. Nominal micron
rating generally taken to mean that 98% of all particles
over a given micron value have been removed by specific
medium. Absolute micron rating is generally taken to
mean that all particles over a given micron value have
been removed. Naked eye can see a particle 40 micron
or larger.
MICRON RATING
The smallest size of particles
a filter can remove.
MIGRATION
Contaminate released down
stream of a filter.
MIST
Visible water or hydrocarbon
vapor; floating or falling in fine drops.
MIT FLEX
A test whereby a filter
media specimen is rapidly flexed in an arc under a specified
load until fabric rupture occurs. Test conditions are
usually: 270° arc, 180 cycles/minute, 4-pound load,
1/2-inch width specimen.
MMSCFD
Million standard cubic
feet per day.
MONOFILAMENT MESH
A woven fabric with evenlyspaced
holes. Each thread is a single filament. The mesh combines
excellent strength with little or no fiber migration.
MOTIVATING FORCE
That which cause the coalescing,
filtering or separating action to take place.
MSCFD
Thousand standard cubic
feet per day.
MUD SUMP
Area of a horizontal housing,
located upstream of the media, for the collection of
solids falling out by gravity prior to going through
the coalescing media, where gross solids are present
in the stream.
MULTIFILAMENT MESH
A type or woven fabric,
where each thread consists of many smaller diameters
threads twisted together.
