Kidde Fire Systems Argonite, Инструкция по проектированию, установке и обслуживанию

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3-1
September 2004
ENVIRO-55™ Engineered Fire Suppression System
38-KFSARG-000
3-1 INTRODUCTION
Design guidelines for Argonite
®
systems are as established in NFPA 2001, Standard for Clean
Agent Fire Extinguishing Systems . Argonite has been designated IG-55 in NFPA 2001 as a blend
of two inert gases: Nitrogen and Argon (50% and 50%, respectively).
3-2 DESIGN STANDARDS
An Argonite system shall always be designed in accordance with the latest version of applicable
design standards, taking into consideration requirements specified by local authorities having
jurisdiction.
• NFPA 2001,
Standard for Clean Agent Fire Extinguishing Systems
3-3 PERSONAL SAFETY
When extinguishing a fire using Argonite, the oxygen level in the protected
room is reduced to a level that will not sustain combustion. This could create an
imminent risk to personnel occupying the enclosure if the residual oxygen level
becomes less than that which can support life. Products of combustion from the
fire must also be considered a hazard.
Suitable safeguards shall always be provided to ensure prompt evacuation from and prevent
entry into a hazardous atmosphere, and include a safe means for prompt rescue of any trapped
personnel. Safety items such as personnel training, warning signs, discharge alarms, self-
contained breathing apparatus, evacuation plans and fire drills shall be considered and
implemented as required.
Personnel should be acquainted with the fact that Argonite presents a noise
hazard during discharge and may result in damage to hearing if personnel are
present without protection during discharge.
Consideration shall be given to the possibility of migration of Argonite to adjacent areas outside
of the protected space (pressure relief vent openings, etc.).
Argonite systems may be designed for a residual oxygen level of 12% (sea level equivalent) if
personnel can vacate the area within five minutes (exposure time of 5 minutes or less), but may
be designed to have a residual oxygen level of 10% (sea level equivalent) if personnel can
vacate the area within 3 minutes (exposure limited to 3 minutes or less).
Argonite systems designed to reduce oxygen levels to below 12% should only
be provided in normally unoccupied areas.
Should the possibility exist for the oxygen level to drop below 10%, personnel must be evacuated
prior to such oxygen depletion. A design concentration resulting in an oxygen level of less than
10% may only be used in normally unoccupied areas, and only if the personnel who could
possibly be exposed can vacate the area within 30 seconds.
However, in all of situations it is necessary that personnel evacuate the hazard
prior to
system discharge. Hence the need to include both predischarge alarms and time delays into
all system designs.
CHAPTER 3
DESIGN GUIDELINES