Instruction Manual

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6.4 Medical Air Systems Glossary
Denitions
ICFM   • Conditionsattheinletofthecompressorpriortoanyrestrictionsor
temperature changes. (i.e., inlet lters, inter-coolers, discharge manifolds
etc).
Displacement  • Theoreticalphysicalvolumeoftheairinthecompressorchamberbased
    upon100%pumpingeciency,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ow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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