Progress: Not Addressed
DOT Relevance: 192.706
Leakage surveys for transmission lines fall under Subpart M (Maintenance) of 49 CFR 192. This subpart lists the minimum intervals at which leak surveys on transmission lines should be conducted.
Because of the increased flammability range of hydrogen relative to natural gas, special leak surveys are likely appropriate for hydrogen pipelines. 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.
Current work should continue on hydrogen sensors and detectors. Standards for hydrogen transmission line leak surveys must be established and incorporated by reference into the federal code.