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H₂ Blending into Natural Gas

Hydrogen · Wobbe Index · Energy content · Embrittlement

H₂ Blending into NG — Wobbe / Energy / Embrittlement
Computes the property impact of blending hydrogen into natural gas: Wobbe Index shift (appliance compatibility), HHV change (energy delivery), volumetric flow penalty for the same MMBtu, and embrittlement risk bracket per blend %. ISO 6976 / GPA 2145 mole-fraction mixing at US standard conditions (60 °F, 14.696 psia).

Blend Ratio

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Common targets: 5–7% (HyDeploy UK), 10–20% (US/EU studies), 100% (dedicated H₂ pipeline).

Natural Gas Composition (vol%)

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Must sum to 100%.

📚 Learn the Theory

H₂ blending into natural gas: Wobbe Index shift, energy content, volume penalty for equivalent energy, and embrittlement risk by blend percentage.

Read Engineering Guide →

Engineering Basis

  • Pure-component HHV (BTU/scf, US std cond): CH₄=1010, C₂H₆=1770, C₃H₈=2516, H₂=325, N₂=CO₂=0.
  • Mole-fraction mixing for MW and HHV; Wobbe = HHV / √(MW/28.964).
  • H₂ delivers ~1/3 the energy per scf as CH₄ — significant volume penalty for energy parity.
  • Embrittlement risk bracket: <5% low (HyDeploy/AGA field-trial OK), 5-20% medium, 20-50% high, >50% needs dedicated H₂ pipeline.
  • Standards: ISO 6976:2016, GPA Standard 2145, AGA Report No. 5, ASME B31.12, NACE MR0175.

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