User's Manual

Design
P/N 81-CO2MAN-001 3-49 September 2013
3-6.3.3 NOZZLES
Type "S" and Type "M" nozzles are used when applying a Rate-by-Volume local application
system.
A sufficient number of nozzles shall be used to adequately cover the entire assumed volume.
Nozzles shall be located and directed so as to retain the discharged carbon dioxide within the
hazard volume by suitable cooperation between nozzles and flow obstructions. Nozzles shall
be located so as to compensate for any possible effects of air currents, winds, or forced drafts.
Figure 3-5 is provided as an illustrated example. Actual configurations may differ significantly,
as dictated by the geometry of the hazard.
From Equation (30):
Where is the Minimum Discharge Rate, is the Design Flow Rate per Unit Volume, and
is the Volume of the Assumed Enclosure.
From Equation (29):
Where is the Open Area of the Assumed Enclosure Walls and is the Total Area of
Assumed Enclosure Walls.
= (7-1/2 x 5) + (9 x 5) + (7-1/2 x 5) + (9 x 5)
= 165
ft.
2
= (7.5 x 5) + (9 x 5)
= 82.5
ft.
2
= 0.75 x (  ) + 0.25
= 0.75 x (82.5  165) + 0.25
= 0.625 lb./min./
ft.
3
= x
= 0.625 x 337.5
= 211 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 q x
= 1.4 x 211 x 0.5
= 148 lb.
q
min
q
v
V=
q
min
qV
V
q
V
0.75 A
O
A
W
 0.25+=
A
O
A
W
A
W
A
W
A
O
A
O
qV
A
O
A
W
qV
qV
q
min
qV
V
q
min
q
min
W
min
1.4 qt
liq
=
W
min
t
liq
t
liq
W
min
t
liq
W
min
W
min