The issue of installing pressure control valves for flare discharge in hydrogen pipeline networks
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Recently, I saw in the guidelines for hydrogen balance design across the plant that \"pressure control valves for flare discharge should not be installed in pure hydrogen pipelines\"； \"Pressure control valves for venting to flare stacks should be installed in hydrogen gas pipelines.\" I’m not sure what the purpose of this requirement is; any netizens from Haichuan who can explain why would be appreciated, thank you!
The purpose of this regulation is to prevent hydrogen from accumulating in the pipeline network and posing a risk of explosion. Pure hydrogen pipelines contain only hydrogen as a component, and they are prone to leakage. If pressure control valves are installed, they will open automatically when the pressure of hydrogen in the pipeline becomes too high, allowing the hydrogen to be released. However, this merely releases the hydrogen into the air; if there is still a small amount of hydrogen remaining inside the pipeline, it can still pose an explosion risk. Therefore, it is recommended that pressure control valves not be installed in pure hydrogen pipelines; instead, other measures should be taken to reduce the pressure of hydrogen within the pipelines. In hydrogen gas pipelines, since other gases are also mixed in, a pressure control valve for flare discharge can be installed to prevent the hydrogen pressure inside the pipeline from rising too high, thereby ensuring safety. .
Which standard or book specifies this? Please provide it