is the agent volume requirement (in cubic metres per cubic metre); i.e. the quantity Q (in cubic metres) of agent required at a reference temperature of 20 °С and a pressure of 1,013 bar per cubic metre of protected volume to produce the indicated concentration at the temperature specified:
Qr =m-SR
where
Sr is the specific reference volume (in cubic metres per kilogram); i.e. the specific vapour volume at the filling reference temperature for superheated IG-01 vapour at a pressure of 1,013 bar which may be approximated by the formula:
Sr = ^i+A27r
where k = 0,56119; k% = 0,0020545; 7r is the reference temperature (in degrees Celsius); i.e. filling temperature (20 °С in the table).
К . ( 100
от = — In
^100-cJ
is the net volume of hazard (in cubic metres); i.e. the enclosed volume minus the fixed structures impervious to extinguishant.
is the temperature (in degrees Celsius); i.e. the design temperature in the hazard area.
is the specific volume (in cubic metres per kilogram); the specific volume of superheated IG-01 vapour at a pressure of 1,013 bar may be approximated by
S = k^ + Л2 ■ T .
is the concentration (in percent); i.e. the volumetric concentration of IG-01 in air at the temperature indicated, and a pressure of 1,013 bar absolute.
Table 4 — IG-01 reference extinguishing and design concentrations
|
Fuel |
Extinguishment % by volume |
Minimum design % by volume |
|
Class В Heptane (cup burner) Heptane (room test) |
39,1 39,8 |
51,7 |
|
Surface Class A Wood crib PMMA PP ABS |
30,7 31,6 31,6 32,2 |
41,9 |
|
Higher Hazard Class A |
a |
49,2 |
|
The extinguishment values for the Class В and the Surface Class A fuels are determined by testing in accordance with EN 15004-1:2008, Annexes В and C. The minimum design concentration for the Class В fuel is the higher value of the heptane cup burner or room test heptane extinguishment concentration multiplied by 1,3. The minimum design concentration for Surface Class A fuel is the highest value of the wood crib, PMMA, PP or ABS extinguishment concentrations multiplied by 1,3. In the absence of any of the 4 extinguishment values, the minimum design concentration for Surface Class A shall be that of Higher Hazard Class A. See EN 15004-1:2008, 7.5.1.3, for guidance on Class A fuels. The extinguishing and design concentrations for room-scale test fires are for informational purposes only. Lower and higher extinguishing concentrations than those shown for room-scale test fires may be achieved and allowed when validated by test reports from internationally recognized laboratories. |
||
|
a The minimum design concentration for Higher Hazard Class A fuels shall be the higher of the Surface Class A or 95 % of the Class В minimum design concentration. |
||
5 Safety of personnel
Any hazard to personnel created by the discharge of IG-01 shall be considered in the design of the system.
Potential hazards can arise from the following:
the extinguishant itself;
the combustion products of the fire.
For minimum safety requirements, see EN 15004-1:2008, Clause 5.
Physiological information for IG-01 is given in Table 5.Table 5 — Physiological information for IG-01
|
Property |
Value % by volume |
|
No observed adverse effect level (NOAEL) |
43 |
|
Lowest observed adverse effect level (LOAEL) |
52 |
|
These values are based on physiological effects in human subjects of hypoxic atmospheres. These values are the functional equivalents of NOAEL and LOAEL values, and correspond to 12 % minimum oxygen for the no-effect level and 10 % minimum oxygen for the low-effect level. |
|
6 System design
Fill pressure
The fill pressure of the container shall not exceed the values given in Tables 6, 7 and 8.
The relationships between pressure and temperature are shown in Figure 1 for various levels of pressurization.
Table 6 — Storage container characteristics for IG-01 — 160 bar
|
Property |
Unit |
Value |
|
Filling pressure at 15 °С |
bara |
160 |
|
Maximum container working pressure at 50 °С |
bara |
188 |
|
Reference should be made to Figure 1 for further data on pressure/temperature relationships. |
||
|
a 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2. |
||
Table 7 — Storage container characteristics for IG-01 — 200 bar
|
Property |
Unit |
Value |
|
Filling pressure at 15 °С |
bara |
200 |
|
Maximum container working pressure at 50 °С |
bara |
235 |
|
Reference should be made to Figure 1 for further data on pressure/temperature relationships. |
||
|
a 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2. |
||
Table 8 — Storage container characteristics for IG-01 — 300 bar
|
Property |
Unit |
Value |
|
Filling pressure at 15 °С |
bara |
300 |
|
Maximum container working pressure at 50 °С |
bara |
362 |
|
Reference should be made to Figure 1 for further data on pressure/temperature relationships. |
||
|
a 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2. |
||
Key
X temperature, °С
Y pressure, bar
a pressure at 15 °С, bar
Figure 1 — Temperature/pressure graph for IG-01 to 160 bar, 200 bar and 300 bar
Superpressurization
Containers for IG-01 are not superpressurized.
Extinguishant quantity
The quantity of extinguishant shall be the minimum required to achieve the design concentration within the ENZ15004Uir2008t7e6minimUm eXpeCted temPerature' determined using Table 3 and the method according to
The design concentrations shall be those specified for relevant hazards in Table 4, including a 1 3 safetv factor on the extinguishing concentration. ’ 3
Consideration should be given to increasing this for particular hazards, while seeking advice from the relevant
