shield exposed moving parts. A three position "hand-off-automatic"
selector switch shall be provided for each motor. Cooling water shall be
served from a partial water recirculating system containing a water
recirculation reservoir with liquid level gauge, water metering valve,
manual fill valve, strainers and solenoid valve, air gap, aquastats, and
isolation valves. System shall conform to NFPA 99.
2.19
MEDICAL GAS SYSTEMS
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NOTE: References to nitrous oxide will be deleted,
if use of nitrous oxide is not required. Bulk
storage of oxygen and nitrous oxide will be
specified for hospitals of 200 beds or more, or
where consumption is estimated to exceed 1,000 cu.
meters (35,000 cubic feet) per month in areas where
bulk-storage service is available. Bulk oxygen
systems will conform to the requirements of both
NFPA 50 and NFPA 99. If bulk storage systems are
required, the paragraphs will be revised
accordingly. A paved and fenced area should be
provided with sufficient space for easy entrance of
trailers and trucks and having the following
dimensions: For hospitals with less than 500 bed
capacity, 5 x 5 meters (16 x 16 feet); for 500 bed
capacity, 5 x 7 meters (16 x 22 feet); for 750 and
1,000 bed capacity, 6 by 9 meters (20 by 30 feet).
Storage area should be located near a good road and
should be surfaced with a concrete mat. Precautions
should be taken in selecting a site away from oil
tanks; sources of intense heat, such as furnaces and
boilers; and away from areas under medium-voltage
electric wires. The storage area should be enclosed
by chain-link fence 2 meters (6 feet) in height,
with double gates of suitable dimensions provided
with stop and lock. Manifold regulating and control
equipment should be provided by the medical gas
supplier. Piping should be underground and conform
to TABLE II. Piping should terminate with capped
ends suitably protected and easily accessible at a
corner of the paved bulk-storage area. Wiring for
the alarm system should be installed underground and
extended to the corner where the medical gas piping
terminates. Floodlights should be provided for the
storage area.
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Medical gas systems comprising medical and dental compressed air, nitrous
oxide, oxygen and nitrogen systems shall conform to NFPA 99. The systems
shall not be used for the distribution of combustible anesthetic gases.
Higher-than-use pressures as indicated shall be used in hospitals for
distribution of medical gas systems, with reduction valves contained in
shutoff valve boxes after the zone shutoff valves. Systems shall be of the
bulk primary source type with cylinder primary systems utilized only as
indicated.
2.19.1
Valves
Valves shall be brass-bodied, packless, diaphragm type with renewable seats
SECTION 15405A
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