MEDICAL LABORATORY AIR SYSTEM DEMAND
Use Factor (%)
Minimum L/s (CFM)
No. of Outlets
3 - 12
13 - 38
39 - 115
116 - 316
317 - 700
Process Air (PA). Process air (PA) may be a centrally piped
system when warranted by the application, e.g. medical service column
adjustment, shop operations, and door operators. The using Military
Department in conjunction with the Design Agent will identify PA
requirements. PA is not required to be oil free, but shall be suitable
for the application.
Air Quality Standard. Air compressors used for PA shall be
specifically designed and manufactured for this purpose. PA quality
shall be in accordance with the requirements of the equipment serviced.
Intake air shall be direct from outdoors or from some other non-
contaminated source. PA supply pressure and tolerance shall be a
function of the application and the serviced equipment manufacturer's
recommendation. Many applications shall be a minimum of 830 kPa (120
psig), with a tolerance of +35 kPa (5 psig) tolerance.
The number of compressors for a PA
PA System Components.
system shall be a function of the application two or more for critical
applications and one acceptable for non-critical. Coordinate the
compressor arrangement with the Using Service's Design Agent. Each
compressor for critical applications shall be sized to provide 65% of the
maximum demand if any one compressor fails. Provide an alarm to indicate
compressor failure that annunciates to the master medical gas alarm
panel. All system components downstream of compressors shall be sized
for maximum combined compressor output.
PA System Demand. The number of workstations and their
functions plus the requirement of any equipment shall determine the PA
system flow demand. The using Service shall provide this information.
The designer in conjunction with the Design Agent shall establish the
Surgical Handpiece Drive Air (SHDA). SHDA may be used as a
substitute for nitrogen to power pneumatic surgical handpieces used in
dental procedures. SHDA is not used for breathing or respiratory
support. SHDA must be a separate system from DCA and dental LA; however,
DCA may be used as a first stage of compression.
SHDA Air Quality Standard. Air compressors used for SHDA
shall be specifically designed and manufactured for the given
application. SHDA quality shall be in accordance with the DCA
requirements. Intake shall be direct from outdoors or of quality better
than outside air. Locate intake in accordance with the NFPA 99
(reference 9r). SHDA shall be supplied to the outlets at 1035 kPa (150
psig). A minimum pressure of 1105 kPa (160 psig) shall be maintained at