Progress: Not Addressed
DOT Relevance: 192.723
Leakage surveys for distribution lines fall under Subpart M (Maintenance) of 49 CFR 192. This subpart lists the minimum intervals at which leak surveys on distribution lines should be conducted.
Because of the increased flammability range of hydrogen relative to natural gas, special leak surveys are likely appropriate for hydrogen distribution systems. The adequacy of current combustible gas and hydrogen-specific detection methods and equipment need to be assessed relative to industry leak survey practices.
This topic will be part of the integrity management process that will be mandatory in ASME B31.12.
Standards for hydrogen distribution line leak surveys must be established and incorporated by reference into the federal code.