pressures at that location.
Demand. The piping system shall be suitable to deliver 7
L/s (15 cfm) per outlet, with a demand usage factor of 100 percent. For
the purpose of determining storage capacity, designers shall analyze the
nitrogen demand of the tools and equipment intended for that facility, in
consultation with the Using Service. When this information is not
available, the required storage capacity may be estimated using
Table 9-18 (reference 9x).
per Bank *
* Assumes "H" cylinders and one complete change each week.
Sterilization Gas. Gas/vapor sterilization may be used for
treating contaminated medical equipment, implements, and certain
infectious waste. In this method, the sterilizing agent is a gaseous or
vaporized chemical. The two most commonly used chemicals are ethylene
oxide (ETO) and formaldehyde, which may be carcinogenic.
Ethylene Oxide. All precautions in the use of ETO as
outlined by OSHA (reference 9y) and NIOSH CIB 52 (reference 9z) shall be
strictly followed. ETO is regarded as a potential occupational
(a) Layout. Where ETO is planned in a facility, a separate
room for sterilizer, ETO supply cylinder, and associated piping shall be
provided. Access to this equipment and storage room shall be from the
Central Material Service work area only. The front of the sterilizer
shall be accessed from the loading room.
(b) Components. The cylinder supply line shall have a
three-way valve to permit exhausting residual ETO vapors prior to
changing the tanks. The supply, tank, and vent valves shall be labeled.
Ventilation. Ventilation shall also be provided for
the waste gases from the sterilizer evacuation line and the drain air
Emission Control. Some states have adopted legislation
that prohibits the release of ETO sterilizer exhaust gas to the
atmosphere. Presently the only available ETO emission control technology
is based on a chemical conversion or scrubber. The design shall
incorporate the necessary provisions to comply with both federal and
state legislation. Local requirements shall be coordinated with the
using Military Department and Design Agent.