Method of transporting hydrogen by means of a natural gas conduit system and of recovering pure hydrogen and on-spec natural gas, comprising the following steps: (a) providing a natural gas conduit system comprising: - at least one transport conduit through which a natural gas transport stream flows, - a hydrogen introduction site, - at least one natural gas withdrawal site downstream of the hydrogen introduction site and - a hydrogen withdrawal site downstream of the at least one natural gas withdrawal site, (b) introducing a hydrogen introduction stream into the transport conduit through which the natural gas transport stream flows via the hydrogen introduction site, (c) discharging a first natural gas withdrawal stream comprising at least a portion of the natural gas transport stream from the transport conduit via a first natural gas withdrawal site, (d) feeding the first natural gas withdrawal stream to a first membrane separation apparatus, separating the first natural gas withdrawal stream in the first membrane separation apparatus into a first, hydrogen-depleted retentate stream and into a first, hydrogen-enriched permeate stream, (e) discharging the first retentate stream from the first membrane separation apparatus and feeding the first retentate stream to a first natural gas consumer, (f) recycling the first permeate stream into the transport conduit downstream of the first natural gas withdrawal site, which gives a hydrogen-enriched natural gas transport stream that is passed onward, (g) discharging a first hydrogen withdrawal stream comprising at least a portion of the hydrogen-enriched natural gas transport stream from the transport conduit via the hydrogen withdrawal site, (h) feeding the first hydrogen withdrawal stream to a second membrane separation apparatus, separating the first hydrogen withdrawal stream in the second membrane separation apparatus into a second, hydrogen-depleted retentate stream and into a second, hydrogen-enriched permeate stream, (i) discharging the second permeate stream from the second membrane separation apparatus as hydrogen discharge stream, (j) discharging the second, hydrogen-depleted retentate stream from the second membrane separation apparatus and feeding the second retentate stream to a second natural gas consumer or recycling the second retentate stream into the transport conduit. (a) providing a natural gas conduit system comprising: - at least one transport conduit through which a natural gas transport stream flows, - a hydrogen introduction site, - at least one natural gas withdrawal site downstream of the hydrogen introduction site and - a hydrogen withdrawal site downstream of the at least one natural gas withdrawal site, - at least one transport conduit through which a natural gas transport stream flows, - a hydrogen introduction site, - at least one natural gas withdrawal site downstream of the hydrogen introduction site and - a hydrogen withdrawal site downstream of the at least one natural gas withdrawal site, (b) introducing a hydrogen introduction stream into the transport conduit through which the natural gas transport stream flows via the hydrogen introduction site, (c) discharging a first natural gas withdrawal stream comprising at least a portion of the natural gas transport stream from the transport conduit via a first natural gas withdrawal site, (d) feeding the first natural gas withdrawal stream to a first membrane separation apparatus, separating the first natural gas withdrawal stream in the first membrane separation apparatus into a first, hydrogen-depleted retentate stream and into a first, hydrogen-enriched permeate stream, (e) discharging the first retentate stream from the first membrane separation apparatus and feeding the first retentate stream to a first natural gas consumer, (f) recycling the first permeate stream into the transport conduit downstream of the first natural gas withdrawal site, which gives a hydrogen-enriched natural gas transport stream that is passed onward, (g) discharging a first hydrogen withdrawal stream comprising at least a portion of the hydrogen-enriched natural gas transport stream from the transport conduit via the hydrogen withdrawal site, (h) feeding the first hydrogen withdrawal stream to a second membrane separation apparatus, separating the first hydrogen withdrawal stream in the second membrane separation apparatus into a second, hydrogen-depleted retentate stream and into a second, hydrogen-enriched permeate stream, (i) discharging the second permeate stream from the second membrane separation apparatus as hydrogen discharge stream, (j) discharging the second, hydrogen-depleted retentate stream from the second membrane separation apparatus and feeding the second retentate stream to a second natural gas consumer or recycling the second retentate stream into the transport conduit.