Delta P
Describes pressure drop through a component relating to difference in pressure between two points
Demand
Flow of air under specific conditions required at a particular point
Desiccant
An adsorption type material used in compressed air dryers industry standards are activated
alumina, silica gel and molecular sieves
Desorption
Opposite of absorption is adsorption, in filtration, it relates to the downstream release of particles
previously retained by the filter.
Dew point
Of a gas is the temperature at which the vapor in a space (at a given pressure) will start to
condense (form dew) dew point of a gas mixture is the temperature at which the highest boiling
point constituent will start to condense
Filter
A device that removes solid contaminates, 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, inter-l by pass
Filter separator
Filtering unit that separates solids and liquid droplets from gas (air) widely used in removing oil
from a gas or air
Flow
The volume of a substance passing a point per unit time, e.g., meters per second, gallons per hour,
etc.
Flow control valve
A valve controlling flow of air that passes through the valve used often for retardation or timing
circuits, but especially for regulating the piston speed in cylinders
Flow meter
An instrument for measuring the amount of air flow of a compressor measured in CFM
Flow rate
The rate flow measured in liters, 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, and
ICFM
Full load
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
Gauge
An instrument for measuring, testing, or registering
Gauge pressure
A pressure as determined by most instruments and gauges
Heatless dryer
Heatless reactivated dryer by means of expanding cold dry air to near atmospheric pressure inside
the regeneration tower, the dryer air picks up moisture from the saturated desiccant bed and purged
to atmosphere
Horsepower (HP)
A unit of work equal to 33,000-foot pounds per minute, 550-foot pounds per second, or 746 watts
Humidity
The moisture content of air
Humidity specific
The weight of water vapor in the air vapor mixture per pound of dry air
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