IG 55 inert gas agent, defined in EN15004-9 and ISO 14520-12, is a blend of Nitrogen (50-52%) and Argon (48-50%). These two gases are mixed in these specified proportions to form the agent.
Benefits of IG 55 Inert Gas:
- Zero Ozone Depleting Potential (ODP): Environmentally friendly with no impact on the ozone layer.
- Space-Efficient Storage: Requires minimal storage space compared to some other agents.
- Residue-Free: Leaves no post-fire residue, eliminating the need for cleanup.
- Non-Damaging: Does not harm protected equipment during or after discharge.
- Electrically Non-Conductive: Safe for use around electrical and electronic equipment.
- Occupant-Safe: Suitable for a wide range of normally occupied hazard areas.
- SNAP List Approved: Recognized as safe and effective under the U.S. EPA’s Significant New Alternatives Policy (SNAP).
- No Atmospheric Lifetime: Does not persist in the atmosphere after discharge.
- No Global Warming Potential: Has no contribution to global warming, ensuring environmental sustainability.
System Design Calculation
IG 55 System design comprises two primary elements. The first is risk assessment, which involves determining the Hazard class and necessary type of protection and evaluating factors such as ventilation, structural openings, restrictions, and the placement of equipment. The second is gas quantity calculation, which includes determining the required amount of IG-55 inert gas. This calculation accounts for floor and ceiling voids, nozzle positioning, electrical requirements, and other system-specific considerations.
IG 55 Calculation TableS
IG 55 Equation for Quantity Requirement
The minimum required agent quantity is determined based on the hazard volume, the lowest anticipated temperature, and the necessary concentration. The following equation is used to calculate this minimum quantity:
m = Required Agent Quantity (Kg)
V = Hazard Net Volume (m3) (enclosed volume minus the fixed structures imperious to the ext.)
CAlt = Altitude Correction Factor
C = Required IG-551 concentration. (% by volume).
S = Specific Volume (m3/kg)
