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Only one cylinder bank shall be used at one time. Switch-over from
exhausted to full cylinders shall be automatic and without pressure
fluctuation. Provide a pressure regulating valve down stream of
switch-over valves. Resetting of manifold controls shall be automatic or
manual after the replacement of empty cylinders. Pressure switch shall
actuate switch-over controls and "Reserve In-Use" alarms. House manifold
controls in a sheet steel cabinet. [Size the nitrous oxide regulators for
a flow rate of 2625 milliter per second at 5515 kPa (gage) inlet and 345
kPa (gage) 2500 cubic feet per hour (cfh) at 800 psig inlet and 50 psig
outlet pressures.]
2.2.3
Medical Air Systems
Provide medical compressed air with minimum air quality of CGA G-7.1, Grade
D.
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NOTE: Use piston (reciprocating) compressors for
air flow up to 47 liter per second 100 cfmand power
up to 19 kilowatt 25 horsepower. Use piston or
rotary for air flow greater than 47 liter per second
100 cfm and power over 19 kilowatt 25 horsepower.
The use of oil-free compressors is to exclude oil
from the air stream and compression chambers.
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2.2.3.1
Submit manufacturer, model, operating speed (revolutions per second minute
), capacity (liter per second (L/s) (cubic feet per minute (cfm), free air
delivered at indicated pressure), bearings, lubrication, receiver capacity
(liter) (gallon), electric motor (manufacture, frame, type, speed, current
characteristics, and kilowatt horsepower), thermal cutoff switch
(manufacturer, type, and model), starter (manufacturer, type, and model),
air silencer (manufacturer, type, and model), air filter (manufacturer,
type, and model), air cooler (manufacturer, type and model), and air dryer
(manufacturer, type, and model. Oil-free [piston] [or] [rotary]
compressors with steel body construction, capable of continuous operation
at indicated discharge pressures and compatible with pneumatic surgical or
medical handpieces. Provide filter-muffler intake for each compressor.
Provide outlet filters.
[2.2.3.2
Aftercoolers
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NOTE: Aftercoolers are generally required only for
piston air compressors. Delete this paragraph if
there is no aftercooler.
**************************************************************************
Steel body construction. Size aftercoolers for cooling the air to within
15 degrees of inlet water temperatures. Provide solenoid or automatic
valve to shut off cooling water when compressor is not running.
]2.2.3.3
Drives
Provide direct drives with flexible couplings or V-belt drives.
SECTION 15217N
Page 20
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