Is a pipeline with 75% hydrogen and 24% nitrogen (both as molar fractions of the components) considered a hydrogen pipeline?
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The molar fraction of hydrogen in the pipeline is around 75%, while the molar fraction of nitrogen is around 24%; the remainder consists of impurity gases. Does such a pipeline qualify as a hydrogen pipeline? Furthermore, is it subject to the provisions related to hydrogen pipelines in GB50177-2005 \"Code for Design of Hydrogen Stations\"? I would appreciate your advice. Thank you.
It should be counted; the purity of hydrogen is already very high
1) The pipeline should be considered as a hydrogen-containing medium pipeline； 2) Whether it is applicable to the design codes for hydrogen stations depends on the context in which such pipelines are used. For example, the hydrogen pipelines in the hydrogenation units of refineries basically do not follow the design specifications for hydrogen stations.
It belongs to hydrogen pipelines, but it is not necessary to follow the specifications for hydrogen stations.