MIL-HDBK-1191
9.6.21
Nitrous Oxide (NO). Nitrous oxide is an anesthetic gas
capable of inducing the first and second stages of anesthesia when
inhaled. It is classified as a nonflammable gas; however, it can
increase the range of flammability of other materials and gases when
present in sufficient concentration. Its storage requires proper
construction and ventilation in accordance with NFPA 99 (reference 9r).
Nitrous oxide manifolds shall not be located outside in cold climates due
to the low vapor pressure of nitrous oxide at low temperatures. Nitrous
oxide shall be supplied at a minimum of 345 kPa (50 psig) at all outlets
with a tolerance of +35 kPa (5 psig).
System Demand. The piping system shall be designed to
9.6.21.1
provide for a demand of 20 L/min (0.7 cfm) per outlet with the usage
factors from Table 9-16 (reference 9x).
TABLE 9-16
NITROUS OXIDE SYSTEM UTILIZATION FACTORS
Percent Usage
Number of Outlets
1--3
100
4-12
75
13-20
50
21-40
31
41 or more
25
For determining storage capacity for predominantly inpatient facilities,
Designers may use Table 9-17. For predominantly outpatient facilities,
designers shall determine storage requirements from historical
consumption data of similar facilities, or by consulting the Using Agency
as to the probable flow rate and duration for the planned healthcare
procedures.
TABLE 9-17
NITROUS OXIDE SYSTEM MANIFOLD SIZING
1
Number of Cylinders/Bank
Number of Beds
50 - 100
2 expandable to 4
100 - 250
4 expandable to 6
250 - 500
6 expandable to 8
Special Study 2
500 or More
1
Based on "G" cylinders and one complete change each week.
2
The special study shall include an analysis of an
appropriate diversity factor and the cost effective
option between cylinder and bulk storage.
Nitrogen (NI). Nitrogen is an inert gas primarily used as an
9.6.22
operating or driving means for medical and dental handpieces and
equipment, and as an inert gas environment for laboratory uses. The
cylinder manifold system shall be designed and installed in accordance
with NFPA 99 (reference 9r). Nitrogen shall be supplied at a minimum of
1105 kPa (160 psig) at all outlets with a tolerance of +138 kPa (20
psig).
Control Cabinet. Each individual nitrogen use location
9.6.22.1
(e.g., individual operating room, dental treatment rooms) shall be
provided with a nitrogen control cabinet with pressure gauges and
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