System Design
06-237518-001
3-5
July 2018
3-3.1
LPCB Redbook Listed Extinguishing Values
The listed Redbook LPCB values for the Agents are listed below.
3-4
DISCHARGE TIME
For Industrial systems, ISO 14520/EN 15004-1, NFPA 2001, and VdS requires that 95% of the
minimum design quantity of the required agent be released within 120 seconds for Class A fires
and 60 seconds for Class B. Standard Australia requires the extinguishing concentration to be
achieved within 60 seconds and the remaining agent up to the minimum design concentration
be discharged within 120 seconds.
In reality, in very few cases will the calculated quantity based on only the MDC be sufficient to
meet the discharge time requirements, so the flow/time conditions shall always be verified
using the Flow Calculation software.
3-5
MINIMUM DESIGN CONCENTRATIONS (MDC’S)
The resulting oxygen concentration (ROL) of the hazard area after a discharge shall always be
within the project/safety regulations (NOAEL 43% / LOAEL 52%)
Abbreviations used in table below:
EC = Extinguishing Concentration
SF = Safety Factor
MDC = Minimum Design Concentration
MDQ = Minimum Design Quantity
ROL = Residual O2 Level (Concentration)
Values calculated at 20 degree Celsius and atmospheric pressure 1.013 bar. For certain Class
B fuels, should the MEC be below the heptane, the value for heptane shall be used to calculate
the MDC.
Table 3-3. LPCB Design Concentrations for IG-01 and IG-55
Fuel
IG-01
IG-55
Extinguishment
Concentration
Verified
Design
Concentration
Extinguishment
Concentration
Verified
Design
Concentration
Class A Standard
32.6
42.4
29.9
38.9
Class A Cable
50.2
44.2
Class B
39.7
51.6
35.3
45.9
Table 3-4. LPCB Design Concentrations for IG-100 and IG-541
Fuel
IG-100
IG-541
Extinguishment
Concentration
Verified
Design
Concentration
Extinguishment
Concentration
Verified
Design
Concentration
Class A Standard
29.9
38.9
30.1
39.1
Class A Cable
43.2
42.1
Class B
35.4
46.0
34.3
44.6
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