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Compressed Air Glossary of Terms :: F ::
Glossary Index
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FAD
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Free air delivery. Air at the atmospheric conditions of the
site and unaffected by the compressor. Flow is measured at the
discharge valve of the compressor, after the aftercooler, the
water separator and built in check valve. Capacity and power
consumption are corrected to ISO 1217 standard reference
conditions: Ambient temperature = °20C, Ambient pressure = 1
bar(a), Relative humidity = 0%, Cooling water/air = 20°C,
Effective working pressure at discharge valve = 7 bar(a).
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Fatigued
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A structural failure of the filter medium due to flexing
caused by cyclic differential pressure.
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Ferrography
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An analytical method of assessing machine health by
quantifying and examining ferrous wear particles suspended in the
lubricant or hydraulic fluid.
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Fick's law of diffusion
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A law of chemistry and physics: the rate of diffusion of one substance in
another is proportional to the negative gradient of the concentration of the
first substance.
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Filter
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A device that removes solid contaminants, such as dirt or
metal particles, from a liquid or gas (air is a gas), or that
separates one liquid from another, or a liquid from a gas. The
term filter describes the complete unit ... housing, filter
element, internal by pass.
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Filter breather
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A filtering unit for vented enclosures installed to prevent
dirt and foreign matter from entering the enclosure. Also prevents
oil loss by retaining oil droplets and draining the oil back to
the sump.
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Filter coalescing
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A filter unit that combines three principles to filter out oil
aerosols: 1)
Direct interception
- A sieving action, 2)
Inertial impaction
- Collision with filter media fibers, 3)
Diffusion
-Particles travel in a spiral motion, presenting
an effective frontal area thus capturing particles within the
filter medium.
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Filter efficiency
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The ability of a filter to remove specified test contaminants
under specified test conditions from a specific test fluid, air,
gas or liquid. Expressed as a percentage of the quantity of test
contaminant introduced into the inlet of the filter test
system
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Filter element
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The porous device which perform the actual process of
filtration.
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Filter head
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An end closure for the filter case or bowl that contains one
or more ports.
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Filter housing
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Something that covers or protects the filter
assembly.
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Filter inline
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Inlet and outlet connections are located at the same level on
opposite sides of the filter or other device installed on the
pipeline.
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Filter life test
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A type of filter capacity test in which a clogging contaminant
is added to the influent of a filter, under specified test
conditions, to produce a given rise in pressure drop across the
filter or until a specified reduction of flow is reached. Filter
life may be expressed as test time required to reach terminal
conditions at a specified contaminant addition rate.
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Filter medium
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The porous material contained inside the filter to (a)
separate the contaminants from the incoming air, gas, or liquid.
(b) separate the liquid from the gas. Filter medium is usually
made of paper, wire mesh, special cellulose, or a
combination.
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Filter oil bath
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A labyrinth type filter having the active surfaces
continuously splashed with oil. Most pollutants are absorbed by
the oil which when circulated releases its pollutants, which sink
by gravity to the bottom of the oil pan.
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Filter separator
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Filtering unit that separates solids and liquid droplets from
gas (air). Widely used in removing oil from a gas or
air.
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Filtration
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The physical or mechanical process of separating insoluble
particulate matter from a fluid, such as air or liquid, by passing
the fluid through a filter medium that will not allow the
particulate to pass through it.
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First law of
thermodynamics
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The amount of work done on or by a system is equal to the
amount of energy transferred to or from the
system.
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Fixed compression
ratio
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is the design (built-in) compression ratio for a rotary unit
having this feature
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Flange
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A bolted rim used for attachment to another object.
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Flash point
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Is the lowest temperature to which oil must be heated under
standardized test conditions to drive off sufficient inflammable
vapour to flash when brought into contact with a flame. Flash
points of petroleum based lubricants increase with increasing
pressure.
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Flexible mounting
-
Vibration isolation mount. Provides reductions in vibration
transmission.
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Flow
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The volume of a substance passing a point per unit time (e.g.,
meters per second, gallons per hour, etc.).
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Flow control valve
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A valve that controls the flow of air that passes through the
valve. Used often for retardation or timing circuits, but
especially for regulating the piston speed in cylinders.
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Flow diagram
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A schematic flow sheet showing all controls involved with the
system.
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Flow meter
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An instrument for measuring the amount of air flow of a
compressor. Measured in CFM.
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Flow rate
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The rate (in liters or gallons per minute, cubic meters or
cubic feet per second, or other quantity per time unit) Air
related flows are usually expressed in CFM, SCFM, ACFM, ICFM
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Flushing
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A circulation process designed to remove contamination.
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Foot
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A device for mounting cylinders.
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Forced draft fan
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A fan that generates (by pushing) a flow of ambient air over
the exterior of the finned pipes to dissipate the sensible heat.
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Fouling
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Accumulation of foreign matter, such as mud or debris, in a
cooler, pipe, or valve. In a cooler, H
2
O
D
P and
D
T will be
seen to increase, as well as CTD.
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Free air (FAD)
-
Free air delivery. Air at the atmospheric conditions of the
site and unaffected by the compressor. Flow is measured at the
discharge valve of the compressor, after the aftercooler, the
water separator and built in check valve. Capacity and power
consumption are corrected to ISO 1217 standard reference
conditions: Ambient temperature = °20C, Ambient pressure = 1
bar(a), Relative humidity = 0%, Cooling water/air = 20°C,
Effective working pressure at discharge valve = 7 bar(a).
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Friction
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Surface resistance to relative motion, which slows down
movement and causes heat.
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FRL
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Filter, Regulator and lubricator sometimes combined in one
unit
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Frost point
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Is the unique temperature to which the air (or any gas) must
be cooled in order that it shall be saturated with respect to ice.
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Full load
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Achieved when the air compressor is running at full RPM with a
fully opened inlet and discharge, delivering the maximum volume at
the rated pressure.
Glossary Index
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D
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F
G
H
I
J
K
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M
N
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P
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T
U
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X
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Z
Thanks to Impact RM for permission to reprint the glossary.
Compressed Air Glossary © Impact RM
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