General Information
April 2020 1-14 06-237619-001
1-5.4 Agent Pressure verse Temperature Formulas
See the individual Agent sections for the corresponding graphs.
1-5.5 Operating Temperature Range Limitations
The Kidde IGS has an operating temperature range of -4° to 130°F (-20° to 54°C).
During discharge the temperature within the protected enclosure will drop approx. 9-18 °F
(5 – 10 °C). The temperature will rise again after approx. 2 – 3 min.
1-5.6 Agent Storage Container Temperature Range Limitations
The temperature of the location for the Agent storage containers depends on the design of the
system.
1-5.6.1 Balanced System Agent Storage Container Temperature Range
In balanced systems, where Agent flow through each nozzle is equal, the Agent cylinder
storage temperature range is -4° to 130°F (-20° to 54°C).
1-5.6.2 Unbalanced System Agent Storage Container Temperature Range
In unbalanced systems, where Agent flows through the nozzles at varying rates, the Agent
cylinder storage temperature range is 60°F to 80°F (16°C and 27°C).
The latest version of the flow calculation software is written and tested for a 70°F (21°C) Agent
cylinder storage temperature (for more information see latest version of the Flow Calculation
Software User’s Guide 06-237621-001). If the Agent cylinder storage temperature is outside
of this range, an insufficient quantity of Agent may be discharged from one or more nozzles in
an unbalanced system, resulting in one or more hazards receiving an insufficient concentration
of Agent.
1-5.6.3 Storage
The seamless steel container is filled to 300 bar at 15°C (4351 psig at 59°F) or 200 bar at 15°C
(2901 psig at 59°F) as listed on the label. The pressure of the stored Agent varies substantially
with temperature changes, as illustrated by the temperature verses pressure graphs shown
previously for each Agent. When discharged, the Agent is a gas and is uniformly distributed as
it enters the fire area.
Table 1-3. Agent Pressure Verse Temperature Formulas
Agent Temp. Unit 200 bar 300 bar
IG-100 °F P = 0.555(t) + 167.2 P = 0.894(t) + 247.1
°C P = 0.999(t) + 185.0 P = 1.610(t) + 275.7
IG-55 °F P = 0.575(t) + 166.0 P = 0.943(t) + 244.2
°C P = 1.035(t) + 184.4 P = 1.697(t) + 274.4
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