Amico CSA Triplex SCD Modular Stack Mount - Manual (Page 9)

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6.4 Medical Air Systems Glossary
Definitions
ICFM • Conditions at the inlet of the compressor prior to any restrictions or
temperature changes. (i.e., inlet filters, inter-coolers, discharge manifolds
etc).
Displacement • Theoretical physical volume of the air in the compressor chamber based
upon 100% pumping efficiency, with no allowances made for heat,
friction, clearances, or other losses in the compression cycle.
Peak Calculated • The maximum estimated demand a medical facility will require of a
Load (PCL) medical air system.
• Calculated at SCFM at 100 psig.
Oil-Free Compressor • Compressor with oil within the compressor but absent from the
compression chamber by means of seals and visible vented distance
piece, and a dry compression chamber.
Simultaneous Demand • Operating reference to a condition where all compressors (Lead and Lag
compressors) run simultaneously to satisfy demand in excess of lead
compressor(s) capability.
Dew Point • Temperature and pressure at which medical air will condense water
vapor into liquid water within the medical air pipeline system.
Continuous Duty • Air compressors which can operate continuously (24 hours per day) if
Rated necessary but normally only operate on demand.
LPM • Abbreviation for Liters per minute; a measure of the flow rate of a gas.
Quadruplex System • Medical air system with four compressors (4), each sized for 50% PCL.
ACFM • Actual Cubic Feet per Minute is an expression of actual air volume,
generally corrected for and reference to a particular pressure.
Continuous Duty • Operational reference to compressors operating 24 hours a day,
continuously.
Duplex System • Systems comprised of two (2) compressors, each rated for 100% Peak
Calculated Load (PCL).
Desiccant Dryer • Consists of two towers, whereby the desiccant bed in one tower dries the
air stream while a purge of dry air regenerates the desiccant bed in the
other tower.
NTP • “Normal Temperature and Pressure”, generally accepted as 20˚C (70˚F),
14.969 psi/29.92” Hg barometric pressure, and 36% relative humidity.
Dew Point/CO Monitor • Monitors dew point and carbon monoxide levels in medical air.
Oil-Less Compressor • Compressor with no oil contained within the compressor.
SCFM • Standard Cubic Feet Per Minute is an expression of air at NTP.
Triplex Systems • Medical air system with three compressors (3), each sized for 100% PCL.
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