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PNGRB report maps step-wise hydrogen blending: 2% safe, 20% only with new infra
India’s petroleum and gas regulator has drawn up a roadmap for phased hydrogen blending in natural gas pipelines, setting safe thresholds, and benchmarking global pilot projects as reference models for domestic rollouts.
According to a report prepared jointly by the Petroleum and Natural Gas Regulatory Board’s (PNGRB’s) Hydrogen Cell and ICF Consulting India, hydrogen blending of up to 2 per cent can be introduced without requiring changes in appliances and is safe in all networks.
It said that blending in the range of 2–5 per cent is suitable for early-phase pilots provided continuous monitoring is in place. For 5–10 per cent blends, operators would need pre-approved materials and leak detection systems.
The report added that blending of 10–20 per cent hydrogen would require certified appliances, standard operating procedures, and structured risk mitigation protocols.
“Above 20 per cent is only feasible in new networks or after infrastructure adaptation,” the document stated.
Blending criteria highlighted in the report include pipeline material compatibility, age and condition of networks, sensitivity of end-users such as hospitals and food processing units, and geographical differences between urban and rural networks
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