4-5
September 2004
Argonite
®
Engineered Fire Suppression System
38-KFSARG-000
4-6.2 Pressure Monitoring
Kidde Fire Systems offers means for remote and local pressure monitoring of the content
within the cylinder.
The local monitoring is by the use of the pressure gauge on each cylinder.
The remote monitoring is by the use of a pressure gauge with supervisory pressure
switch on each cylinder. The switch, which is normally under pressure, consists of one
normally open contact that closes to annunciate loss of pressure at approximately
2200 PSI (150 bar).
4-7 SELECTOR VALVES
In systems where a common cylinder bank protects more than one hazard, selector valves
are utilized. The selector valve is a pneumatically actuated ball valve, sized according to the
system requirements.
In systems where remote indication of release into a specific area is required, a discharge
pressure switch can be fitted downstream of the selector valve.
The solenoid valve energized by the fire alarm/control panel will provide pressure to the pneumatic
actuator on the valve. The solenoid valve will close when de-energized, however the ball valve
must be closed manually.
4-8 DISTRIBUTION PIPE NETWORK AND NOZZLES
The distribution pipe network is to be designed and the nozzles selected and positioned to allow
an even distribution of the Argonite throughout the protected area. The piping and fittings
should conform to NFPA 2001, Power Piping Code, and all local codes and standards.
4-9 FLOW CALCULATIONS
Flow calculations are to be based on the design drawings and should be verified prior to installation
of the nozzles. Any significant changes should be evaluated, and if necessary, the flow calculation
repeated and orifices in restrictor and nozzles replaced to ones suitable for the as-built situation.
All calculations to determine the size of restrictor orifice pipe dimensions and nozzle orifices
must be carried out utilizing the approved Argonite software.
4-10 PRESSURE RELIEF VENTING
When released, fixed fire extinguishing systems employing compressed gases will create a
considerable extra volume of gas within the room due to expansion. To compensate for the
overpressure, suitable means of pressure relief venting must be employed. The free area of
these openings/vents shall be appropriately sized to avoid structural damage.
Normal rooms will withstand an increase of pressure of approximately 5 millibars (2 in. H
2
O).
Pressure relief vents should be located at a high level on the wall or on the ceiling, clear of any
direct nozzle discharge. At the end of the discharge the pressure relief vents shall close in order
to maintain the extinguishing concentration for as long as possible.
The fire rating of all pressure vents should be equal to or greater than the rating of the structure.
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