15.1
Dental compressed air systems and equipment shall be completely
independent of the medical and laboratory air systems and
equipment.
15.2
Central Supply System: Verify with the VAMC the pressure
requirement for Dental Clinic and design the system accordingly.
A.
Dental air compressors shall be designed specially to produce
1200 kPa (175 psi) // 860 kPa (125 psi) //air with a single
stage, without excess noise and vibration. The system shall be
capable of producing //Grade H // Grade D // air, as defined
by Compressed Gas Association Standard G-7.1.
B.
Dental air compressors shall be // multiplex // duplex //
tripled // with a single receiver. Size compressors such that
100 percent of the design load is carried with the largest
single unit out of service.
C.
Include // primary // and // secondary // air dryers, filters,
pressure regulators, and continuous line dewpoint and carbon
monoxide monitoring, all with valve bypass.
D.
Locate compressors in a clean, relatively cool environment
[i.e., not with steam equipment, not to exceed 38 degrees C
(100 degrees F) ambient temperature.] Locate equipment in an
area where it can be monitored regularly by qualified
personnel.
E.
Place a source shut-off valve at the immediate outlet of the
source regulator, so that the entire supply source, including
all accessory equipment, can be isolated from the entire
pipeline system.
F.
Locate the dental air compressor system intake outdoors above
roof level, at least 7500 mm (25 feet) [may be more depending
upon prevailing wind direction and velocity] from any building
opening or other intake, and where no contamination from
engine exhausts, fuel storage vents, vacuum system discharges,
particulate matter or odor of any type is anticipated. Air
that is already filtered for ventilation system use is an
acceptable source of air for dental air compressors. Combined
intakes must be sized for no restriction while flowing maximum
intake possible, and provided with an isolation valve at the
header for each compressor served.
15.3
A.
Design pressure system to deliver a regulated // 965 kPa (140
psi) // 690 kPa (100 psi) // and not to exceed 35 kPa (5 psi)
loss from source to point of use.
B.
Provide 13 mm (1/2 inch) riser for each utility junction
center (UJC) in the dental treatment rooms. Connect riser to
branch or main line.
C.
Each branch riser supplied from the main line shall have an
in-line shut-off valve adjacent to the main. Conceal in-line
shut-off valves (e.g. above ceiling with ceiling tag, or in a
locked equipment room.)
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