11.
INTERIOR FUEL GAS SYSTEM
Design in accordance with NFPA 54.
11.1
Provide solenoid valve in the natural gas supply line to the
dental laboratory and the dental clinic operatories with an
emergency shut-off for each area located at the exit.
11.2
Provide solenoid valve in the gas supply to the kitchen area with
an emergency shut-off located in the area. Coordinate with the
kitchen equipment drawings.
12.
MEDICAL GAS AND VACUUM SYSTEMS
12.1
Design oxygen, medical compressed air, medical vacuum, nitrous
oxide, and nitrogen systems in accordance with current editions of
NFPA 50 and 99, Compressed Gas Association Standards, Master
Specification 15491, and the following:
12.2
During early stages of the project, perform the following:
A.
Test water or obtain analysis from the medical center to
determine if additional water treatment is required for liquid
ring equipment. If so, describe additional requirements in the
specifications. Suitable water quality for no treatment is:
pH - 7.0 minimum
Chlorides - 10 mg/L (ppm) maximum
Hardness - 200 mg/L (ppm) maximum
Total Dissolved Solids - 200 mg/L (ppm) maximum
B.
Establish water pressure at the pump and compressor locations
to determine if booster water pumps are necessary. If pressure
is less than 345 kPa (50 psi), the pump or compressor may not
perform adequately. Investigate several manufacturers'
requirements to maintain competition and to reduce the
incidence of change orders.
12.3
In renovation projects, survey the medical center to ascertain the
type of existing medical gas station outlets and medical vacuum
terminal inlets. The master specification requires that new
outlets and inlets match the existing terminal connections. In the
case where existing station outlets or terminal inlets are not
U.L. approved, or not gas specific as defined in NFPA 99, the
contract specification must be left open for competitive bids on
new outlets and inlets. This may require the medical center to
reterminate the connectors on existing medical devices and
equipment which normally connect to the existing outlets and
inlets.
12.4
Central Supply Systems:
A.
Design medical gas and vacuum systems to deliver the following
pressures at the points of use:
1.
Oxygen, nitrous oxide and medical air: 345 kPa (50 psi).
In designing oxygen systems with adult ventilators, size
the piping system based on the instantaneous demand based
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