User's Manual

Design
P/N 81-CO2MAN-001 3-17 September 2013
3-5.2.5 DISCHARGE RATES
For surface fires, the design concentration shall be achieved within 1 minute from the start of
discharge.
(Equation 11)
Where:
= Minimum discharge rate, lb./min (kg/min)
= Minimum quantity of agent to be supplied from Equation (3), lb. (kg)
= Maximum design discharge time 1 minute, min
Equation (11) may be applied to determine the minimum discharge rate for a complete system,
single hazard, or single nozzle, depending on the value used for
Paragraph 3-7 discusses the effect of combination systems with respect to calculating the
discharge rate.
From Equation (8)
Where is the High Temperature Correction Factor and is the Degrees Fahrenheit
Above 200°F.
=  5
= 50  5
= 10%
From Equation (9)
Where is the Low Temperature Correction Factor and is the Degrees Fahrenheit
below 0°F.
=  1
= 15  1
= 15%
<
Therefore, =

H
T
High
5=

H
T
High

H
T
High

H

H

L
T
Low
1=

L
T
Low

L
T
Low

L

L

H

L


L
W
T
 W
C
W
L
W
V
++=
W
T
0.15 9 0 0++=
W
T
1.4 lb.=
q
min
W
min
t
dmax
=
q
min
Wmin
t
dmax
W
min