Inert Gas System Design Calculator

Calculate inert gas (IG-541 Inergen, IG-55 Argonite, IG-100 Nitrogen) system design per NFPA 2001

Input Parameters

Results

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Design Concentration
%
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Gas Volume Required (NTP)
ft³
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80L Cylinders Required
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Residual O₂ Level
%
Note: Inert gas systems reduce oxygen to levels that suppress combustion while remaining safe for occupied spaces (NOAEL 43% for IG-541). The CO₂ component in IG-541 stimulates breathing.

Reference

NFPA 2001 Inert Gas Systems Volume formula: Vs = V × 2.303 × log₁₀(100/(100-C)) × (530/(T+460)) IG-541 (Inergen): 52% N₂, 40% Ar, 8% CO₂ IG-55 (Argonite): 50% N₂, 50% Ar IG-100: 100% N₂ IG-01: 100% Ar Design concentrations range 36-44% depending on agent and hazard 80L cylinders at 300 bar ≈ 749 ft³ gas at NTP