User's Manual

Design
September 2013 3-34 P/N 81-CO2MAN-001
= x
= 59 x 6
= 354 lb./min
Using the same procedure, determine the minimum quantity of agent and nozzles that could
be used. It is best to use a spreadsheet for such calculations. The following table provides a
summary of the results
Nozzle
Type
Height
(ft.-in)
Flow Rate
(lb./min)
Side of
Square
(ft.)
Qty of Nozzles
Total Rate
(lb./min)
Total
M 4-0 59 3.6 2 3 6 354
4-3 62.5 3.67 2 3 6 375
4-6 66 3.74 2 3 6 396
4-9 69.5 3.81 2 3 6 417
5-0 73 3.87 2 3 6 438
5-3 76.5 3.94 2 3 6 459
5-6 80 4.0 1 2 2 160
5-9 83.5 4.05 1 2 2 167
6-0 87 4.12 1 2 2 174
S 4-0 41 3.27 2 3 6 246
4-3 43 3.33 2 3 6 258
4-6 45 3.39 2 3 6 270
4-9 47 3.48 2 3 6 282
5-0 49 3.54 2 3 6 294
5-3 51 3.61 2 3 6 306
5-6 53 3.67 2 3 6 318
5-9 55 3.74 2 3 6 330
6-0 57 3.81 2 3 6 342
Selecting Type 'M' nozzles at a height of 66 in. results in the lowest quantity of nozzles (2)
and total flow rate (160 lb./min).
From Equation (16):
Where is the Minimum Quantity of Agent to Be Supplied and is the Duration of
Liquid Discharge.
From Paragraph 3-6.1.3:
= 0.5 min
= 1.4 x x
= 1.4 x 160 x 0.5
= 112 lb.
q
OH
q
n
N
q
OH
q
OH
N
w
N
l
W
min
1.4 qt
liq
=
W
min
t
liq
t
liq
W
min
q
t
liq
W
min
W
min