and discs, or ball type capable of being disassembled in line for servicing
the O-ring and seating surface. The valves shall be suitable for cold
nonshock gas working pressure of not less than 2757 kPa 400 psi. Service
control shutoff valves shall be installed in recessed satin finished
stainless steel wall cabinets and shall have color-coded service indication
on valves and valve handles. Cabinets shall be identified by means of
engraved plastic nameplates.
2.19.2
Manifold
Manifolds shall conform to requirements of NFPA 99 as to design features
and pressure requirements. The manifold shall be designed so that when the
switchover from the primary service to the reserve supply occurs, there
will be no drop or fluctuation in the line pressure. The control cabinet
shall have a visual signal to indicate switchover from the primary service
to the reserve supply. Resetting of the control unit shall be accomplished
automatically. The manifold shall be provided with a bronze-bodied
poppet-type pressure-relief adjusted to relieve at 50 percent above maximum
working pressure. The manifold shall be equipped with an approved pressure
switch for actuating a warning signal when, or before, the reserve bank
goes into operation. For cylinder supply systems, manifold capacity shall
be as indicated and control valve shall be contained within a cabinet
designed to prevent tampering by unauthorized personnel. One bank of
cylinders shall be in service while the other bank is in reserve. Each
bank shall be equipped with a master manifold regulator and a gauge for 28
MPa 4,000 psi or greater cylinder-contents pressure. The manifold shall be
completely automatic in switching from the empty bank of cylinders to the
reserve, or full bank of cylinders, and shall not require resetting of the
regulators.
2.20
ALARM PANELS FOR MEDICAL GAS AND VACUUM SYSTEMS
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NOTE: For Air Force facilities the emergency room
area (nurses station or control desk) will have a
central alarm panel. Other appropriate locations,
when approved by the Air Force, are the plant
manager's office and the office/work station of the
inhouse engineer. Local alarm panels for Air Force
facilities will be located at each nursing ward
nurses station, major clinical control desks,
nurseries, and other areas when specifically
designated. Where central supervisory control
panels exist on Air Force facilities, central alarm
systems will be connected to the panel.
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Alarm panels for medical gas and vacuum systems shall be located as
specified and indicated. Each signal and gauge shall be appropriately
labeled "OPERATING" and "EMERGENCY." Each gauge and device shall be
clearly identified by means of engraved plastic nameplates. Alarms and
pressure gauges shall be installed for each medical gas system in
accordance with NFPA 99 and as specified. Alarms and gauges shall be
provided as specified for vacuum, anesthesia, and oral evacuation systems.
Alarm system shall be in a NEMA 250, Type [1] [4] [12] enclosure. Signal
systems shall be energized by the normal and emergency power systems.
SECTION 15405A
Page 61
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