SECTION V
UL EX-4510 12-1-01 Page 5-5
Design
APPLICATION METHOD (Continued)
Total Flooding (Continued)
Complete this step for each area protected by the system.
Example
Computer Room
• (1040 ft
3
Actual Agent Supplied Per Area ÷ 0.86 Altitude
Correction Factor) ÷ 2,500 ft
3
Reduced Volume = .484
Actual INERGEN Agent Flooding Factor
Subfloor
• (104 ft
3
Actual Agent Supplied Per Area ÷ 0.86 Altitude
Correction Factor) ÷ 250 ft
3
Reduced Volume = .484
Actual INERGEN Agent Flooding Factor
STEP NO. 12 – Determine the Design Concentration at
the Maximum Ambient Temperature for Each Area
This step deter mines the Design Concentration of
INERGEN agent in each protected area using the Reduced
Volume and the supplied quantity of agent for the area at
the “Maximum Ambient Temperature.” It is necessary to
assure that we do not over-concentrate the area due to the
additional agent actually supplied to the area and the
increased volume of agent caused by increased tempera-
ture.
To complete this step, refer to the Flooding Factor Chart on
Page 5-11. Star t by locating the Maximum Ambient
Temperature in the left column; follow this line across until
you find the Flooding Factor determined in Step No. 11.
Follow that column up to read the design concentration at
maximum temperature. NOTE: If the maximum tempera-
ture, the Flooding Factor, the Design Concentration, or any
combination of these items, are not listed, interpolation will
be required.
Complete this step for each area protected by the system.
Example
Maximum Ambient Temperature = 80 °F
Flooding Factor = .484
Design Concentration = 38.9%
STEP NO. 13 – Verify that the actual INERGEN agent
concentration is within the design concentration range
of 34.2% to 52%
This step is used to verify that the “worst case” design con-
centration will not exceed limits for fire suppression on the
low end and life safety on the high end. 34.2% INERGEN
concentration relates to 13.8% oxygen concentration and
2.7% carbon dioxide concentration in a protected area, this
is the minimum amount of INERGEN agent required for fire
suppression of most fuels. This minimum concentration of
INERGEN agent must be met in all cases. Failure to
achieve this concentration may prevent suppression of a
fire! 52% INERGEN concentration relates to 10.0% oxygen
concentration and 4.2% carbon dioxide concentration in a
protected space. This is the maximum amount of
INERGEN agent allowed for normally occupied areas.
NOTE: Normally occupied space is defined as “One that is
intended for occupancy” by NFPA 2001. The appendix of
NFPA 2001 states ”Spaces occasionally visited by person-
nel, such as transformer bays, switch-houses, pump rooms,
vaults, engine test stands, cable trays, tunnels, microwave
relay stations, flammable liquid storage areas, enclosed
energy systems, etc., are examples of areas considered
not normally occupied.”
NOTE: Concentration may be between 52% to 62% in nor-
mally non-occupied areas if evacuation of these areas can
be accomplished to limit exposure to less than 30 seconds.
Refer to NFPA 2001, Paragraph 1-6.1.3, for detailed expo-
sure conditions.
Complete this step for each area protected by the system.
Example
38.9% < 52%, therefore the system design is acceptable!
STEP NO. 14 – Determine the Design Concentration at
Normal Ambient Temperature
Complete the same procedure as done in Step No. 12
using the Normal Ambient Temperature instead of the
Maximum Ambient Temperature.
Complete this step for each area protected by the system.
Example
Normal Ambient Temperature = 70 °F.
Flooding Factor = .484
Design Concentration for all areas = 38.4%
