System Design
April 2020 3-20 06-237619-001
• 360° Nozzles-360° nozzles must be located as close to the center of the enclosure
as possible. 360° nozzles have a maximum coverage area defined as any square that
can be inscribed in a circle of radius 25.2 ft (7.7 m, diagonal of a square 17.8 ft x 17.8
ft). Refer to Figure 3-5 for further information.
• Multiple Nozzles-Nozzles whose discharge patterns will intersect must be placed at least
10 ft (3.3 m) apart to assure adequate Agent distribution.
• Reduced Coverage Area-Consideration should be given to reducing nozzle spacing when
obstructions that would impede the uniform distribution of the Agent throughout the area
are present. Nozzle coverage area must be reduced to 25 ft x 25 ft for enclosure heights
six to twelve inches (7.5 m x 7.5 m for heights 0.15 to 0.3 meters).
Limits on Nozzle Conditions:
• Minimum average nozzle pressure-The nozzle pressure must be a minimum of 12.9 bar
(188 psig) for the nozzle to effectively distribute the Agent and mix the Agent into the air
of the enclosure being protected.
• Maximum pressure variance-The maximum pressure variance between nozzles is 10.9
bar (147.0 psig).
• Maximum arrival imbalance-The maximum arrival imbalance between nozzles is 2.4
seconds.
Maximum Elevation Differences in Pipe Runs:
There are no limits on the Maximum Elevation Differences in Pipe Runs.
3-15.3 Tee Split Limitations
The following table outlines the tee split limitations:
Table 3-11. Tee Split Limitations
Tee Style Orientation
Maximum
Split
Minimum
Split
Bull Tee Standard 50:50 10:90
Side Tee Standard 50:50 10:90
Vertical 50:50 10:90
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