as indicated.
2.2.6.1
Surge Control and Silencer for Turbine Pumps
Provide an automatic modulating surge control to bleed air into the turbine
when system operates at less than 50 percent capacity. Mount the surge
control device in the vertical pipe extending from the central separator to
the turbine suction or inlet. For inlet part of the bleed valve, provide a
baffled, sound-absorbent, lined muffler to silence air noise. Control the
bleed valve by a motor current sensing device.
2.2.6.2
Motor Controls
Provide automatic, adjustable, vacuum-sensing, hand-off-automatic, electric
switch; NEMA ICS 6, Type 12, UL-Listed, dustproof control panel; circuit
breakers for each control circuit; hour meter; magnetic starter; and
heavy-duty alternator for the motors.
2.2.6.3
Separators
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NOTE: When the first or primary separators are to
be incorporated in the factory-built dental
equipment, provide secondary or final separators
ahead of the evacuation pump.
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Fabricate separators of welded steel hot-dip galvanized or with a factory
applied corrosion preventative lining. Provide fittings and openings for
the [central] [and] [individual station] separators as indicated. Provide
float switches, drain pumps, sediment strainers, ball floats, quick opening
springs, flushing water supply globe valves, disinfectant funnels and
cocks, cleanout openings, and tangential intakes. Provide water flushing
alarm and high-level cutout float switch.
2.2.7
Bulk Liquid Oxygen Systems
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NOTE: Bulk liquid oxygen (LOX) tanks are normally
purchased; however, they may be leased from the LOX
supplier. In either case, the designer must
coordinate the project design requirements with the
supplier, Contacting Officer, and station
accordingly.
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NFPA 50 and NFPA 99. Provide liquid oxygen storage tanks, evaporators,
piping, and controls.
2.2.7.1
Reserve Oxygen Back-Up
Provide an oxygen cylinder bank, as specified in the paragraph entitled
"Medical Gas Cylinder Manifold Systems," to back-up the bulk liquid oxygen
system. Provide automatic switchover switch with the "Reserve In-Use"
switchover alarm.
2.2.7.2
Liquid Oxygen Storage Tank
Submit manufacturer's data for evaporative coil, liquid level gage, inner
SECTION 15217N
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