System Design
06-237619-001 3-5 April 2020
3-6 IG-55 TOTAL FLOODING CONCENTRATION FACTOR TABLES
Table 3-2. IG-55 US Customary Units Total Flooding Quantity
Temperature
t
°F
Specific
Vapor
Volume
S
IG-55 mass required per unit volume of protected space, m/V (lb/ft
3
)
Design Concentration (volume %)
ft
3
/lb
34% 38% 42% 46% 50% 54% 58% 62%
-10 9.666 0.0430 0.0495 0.0564 0.0637 0.0717 0.0803 0.0897 0.1001
0 9.881 0.0421 0.0484 0.0551 0.0624 0.0702 0.0786 0.0878 0.0979
10 10.096 0.0412 0.0473 0.0540 0.0610 0.0687 0.0769 0.0859 0.0958
20 10.311 0.0403 0.0464 0.0528 0.0598 0.0672 0.0753 0.0841 0.0938
30 10.526 0.0395 0.0454 0.0518 0.0585 0.0659 0.0738 0.0824 0.0919
40 10.741 0.0387 0.0445 0.0507 0.0574 0.0645 0.0723 0.0808 0.0901
50 10.956 0.0379 0.0436 0.0497 0.0562 0.0633 0.0709 0.0792 0.0883
60 11.171 0.0372 0.0428 0.0488 0.0552 0.0620 0.0695 0.0777 0.0866
70 11.386 0.0365 0.0420 0.0478 0.0541 0.0609 0.0682 0.0762 0.0850
80 11.601 0.0358 0.0412 0.0470 0.0531 0.0597 0.0669 0.0748 0.0834
90 11.816 0.0352 0.0405 0.0461 0.0521 0.0587 0.0657 0.0734 0.0819
100 12.031 0.0345 0.0397 0.0453 0.0512 0.0576 0.0645 0.0721 0.0804
110 12.246 0.0339 0.0390 0.0445 0.0503 0.0566 0.0634 0.0708 0.0790
120 12.461 0.0333 0.0384 0.0437 0.0494 0.0556 0.0623 0.0696 0.0776
130 12.676 0.0328 0.0377 0.0430 0.0486 0.0547 0.0613 0.0684 0.0763
m =(V/s)·ln(100/(100-C)), agent mass, lb
FF = m/V=(1/s)·ln(100/(100-C)), mass flooding factor, lb/ft3
C = agent concentration, vol %
V = volume, ft3
s = a + b*t, specific volume of agent, ft3/lb, where a and b are agent-specific constants
IG-55: a = 9.8809 ft3/lb
IG-55: b = 0.0215 ft3/lb-°F
t = temperature, °F
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