Design and Installation
06-236115-001
4-3
October 2014
4-2.2.2.1 Adjusting for Altitude or Pressure
The procedure for determination of the agent quantity assumes that the protected enclosure
is at sea level or has an internal pressure of 14.7 psia (101.4 kPa). The design agent quantity
must be adjusted where the protected enclosure is at an altitude or pressure that differs by
more than 11% from sea level values. Table 4-2 lists "Atmospheric Corrections Factors" as a
function of altitude or pressure. Calculate the adjusted (altitude-corrected) agent quantity as
follows:
Adjusted quantity = (Sea-level quantity) x (Atmospheric Correction Factor)
Note: Use the value of Atmospheric Correction Factor corresponding to the highest possible
enclosure pressure where the pressure can be varied, by design, from the prevailing
barometric pressure at the altitude of the installation. This procedure assures that the
agent concentration will not be less than the design concentration at the highest achiev-
able enclosure pressure.
Table 4-2. Atmospheric Correction Factors
Altitude
Above Sea
Level
Enclosure
Pressure
Atmospheric
Correction
Factor
ft.
m
psia
kPa
-3000
-920
16.25
112.1
1.11
-2000
-610
15.71
108.3
1.07
-1000
-300
15.23
105
1.04
0
0
14.70
101.4
1.00
1000
300
14.18
97.8
0.96
2000
610
13.64
94.1
0.93
3000
920
13.12
90.5
0.89
4000
1,210
12.58
86.8
0.86
5000
1,520
12.04
83
0.82
6000
1,830
11.53
79.5
0.78
7000
2,130
11.03
76.1
0.75
8000
2,440
10.64
73.4
0.72
9000
2,740
10.22
70.5
0.69
10000 3,050
9.77
67.4
0.66
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