Kidde Fire Systems Surge Protector P/N 81-CO2MAN-001 Manuale Utente
Design
P/N 81-CO2MAN-001
3-51
September 2013
All closed sections of pipe (i.e., upstream of a Pneumatic Discharge Delay, Lockout Valve, Stop
Valve, etc.…) shall be fitted with a Safety Outlet (Part No. 81-803242-000).
3-7
COMBINATION SYSTEMS
Large, complex hazards may be divided into smaller hazards that are protected by either a total
flooding or local application design. In such cases, a single agent bank and pipe network may
be used for the entire hazard. When a system utilizes both total flooding and local application
design methods, it is necessary to make adjustments to the design flow rate of the total
flooding portion. The discharge rate for the total flooding portion shall be computed in
accordance with Equation (11), using the total discharge time (i.e., liquid and vapor) calculated
from Equation (31).
(Equation 31)
Where:
= Total system discharge time (liquid and vapor), min
= Duration of liquid discharge of local application portion, min
EXAMPLE 13 - COMBINATION SYSTEMS - Total Flooding Discharge Rate
Consider a room with dimensions of 20 ft.
by 30 ft.
by 10 ft.
and containing
ordinary combustibles. Determine the minimum discharge rate for this hazard if the carbon
dioxide system will also include a local application portion.
From Equation (11):
Where
is the Minimum Discharge Rate of the Total Flooding Portion,
is the
Minimum Agent Quantity of the Total Flooding Portion, and td is the Total System Discharge
Time.
From Equation (3):
Where
is the Quantity of Agent for the Design Concentration,
is the Quantity of Agent
to Compensate for Leakage,
is the Quantity of Agent to Compensate for Ventilation, and
is the Quantity of Agent to Compensate for Extreme Temperatures.
From Equation (2):
Where
is the Basic Quantity (34%) and
is the Material Conversion Factor.
t
d
1.4
t
liq
=
t
d
t
liq
L
W
H
q
min
W
min
t
d max
=
q
min
W
min
W
min
W
C
W
L
W
V
W
T
+
+
+
=
W
C
W
L
W
V
W
T
W
C
W
B
f
C
=
W
B
f
C