Decarbonization›Salt Cavern H₂ Storage
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Salt Cavern H₂ Storage Sizing

Hydrogen · API RP 1170 / SMRI · Working & cushion gas

Salt Cavern H₂ Storage Sizing
Working gas, cushion gas, deliverability rates, and depressurization rate for H₂ storage in a solution-mined salt cavern. Uses ideal gas with simple Z correction. Per API RP 1170 (NG analog) and SMRI guidelines.

Cavern Geometry

m³
bara
bara
°C
m

Cycling

/yr
days
days
$/kg

📚 Learn the Theory

Salt cavern H₂ storage: working gas vs cushion gas, deliverability, API RP 1170 / SMRI guidelines, and grid-scale storage applications.

Read Engineering Guide →

Engineering Basis

  • ρ = P·MW/(Z·R·T) with Z = 1 + 0.0125·Pr for H₂ (Pc = 13 bara).
  • Working gas = (ρ_max − ρ_min) × V; cushion gas = ρ_min × V.
  • Energy density: LHV 33.33 kWh/kg H₂; HHV 39.4 kWh/kg.
  • Salt-cavern cushion fraction typically 20-40% (vs reservoirs 50-70%).
  • Cycles/yr: 6-12 typical for seasonal NG storage; H₂ projects targeting weekly/daily.
  • Standards: API RP 1170 (NG analog), SMRI, Sandia/DOE H₂ storage, Crotogino Etzel cavern.
  • For final design: site-specific geomechanical model + tracer testing.

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