This is not quite true. The original gas pipes in most cities were built for "town gas" which was produced from coal and is 50% hydrogen by volume. The infrastructure could handle hydrogen just fine, but the low conversion efficiencies make it impractical.
replyh2 can be co-mingled with Ng and extracted with a molar filter at the other end.
replyNg pipelines are everywhere, so it makes perfect sense.
None of the pipes or valves are designed for hydrogen. It will steal leak. And leaking a very flammable gas isn’t great.
replyLet alone the compressors or the flow measurement equipment. Also significant portions of the pipesline (especially in neighborhoods / last mile) aren't metal anymore.
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