cylinder, the portion of the piston rod that travels in the crankcase
section does not travel in any portion of the air-cylinder section, and
with provision to prevent the flow of lubrication oil along the piston rod
into the air-cylinder section]. A pressure gauge calibrated to 2068 kPa
300 psi, and equipped with a gauge cock and pulsation dampener shall be
furnished for installation adjacent to the pressure switch. The motor and
compressors shall be directly connected or operated by V-belt drive.
Compressors shall be sequenced to start automatically when the pressure
drops to a preset point. Compressors shall be [air] [water] cooled.
2.17.3
Oil-Free Type Compressors
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NOTE: Where a suitable compressing station is shown
for delivering air to laundries, prosthetic
laboratories, and linen-repair rooms; in addition to
the shops, a duplicate compressor will be required
for compressing and delivering air. Non-oil-free
type compressors are required for delivery of air to
prosthetic laboratories and laundry, at 586 kPa (85
psig), linen repair at 552 kPa (80 psig), and
general laboratories and shops at 207 kPa (30 psig).
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Compressors shall be two-stage, V-belt drive, capable of operating
continuously against their designed discharge pressure, and shall operate
at a speed not in excess of 1800 rpm. Compressors shall have the capacity
and discharge pressure indicated. Compressors shall be assembled complete
on a common subbase. The compressor main bearings shall be either roller
or ball. The discharge passage of the high pressure air shall be piped to
the air receiver with a copper pipe or tubing. A pressure gauge calibrated
to 1034 kPa 150 psi and equipped with a gauge cock and pulsation dampener
shall be furnished for installation adjacent to pressure switches.
2.17.4
Air Receivers
Separate air receivers delivering air to dental operatories, operating,
delivery, and recovery rooms shall be designed for 862 kPa 125 psi working
pressure. All other receivers shall be designed for 1378 kPa 200 psi
working pressure. Receivers shall be factory air tested to 1-1/2 times the
working pressure. Receivers shall be equipped with safety relief valves
and accessories, including pressure gauges and automatic and manual drains.
The outside of air receivers may be galvanized or supplied with commercial
enamel finish. Receivers shall be designed and constructed in accordance
with ASME BPVC SEC VIII D1, and shall have the design working pressures
specified. A display of the ASME seal on the receiver or a certified test
report from an approved independent testing laboratory indicating
conformance to the ASME Code shall be provided.
2.17.5
Air Dryers
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NOTE: Designer will check TM 5-810-4 for air dryer
specification information.
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An air dryer shall be provided in the air supply system to medical and
dental functions. The dryers shall be installed on the downstream side of
the receiver. The dryer shall be capable of drying the maximum anticipated
SECTION 15405A
Page 58
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