Progress: Addressed, Not Adequately
DOT Relevance: 192.721
Section 192.721 (Distribution Systems: Patrolling) of Subpart M (Maintenance) of 49 CFR 192 states, The frequency of patrolling mains must be determined by the severity of the conditions which could cause failure or leakage, and the consequent hazards to public safety.
The frequency of patrols must be determined as well as what locations to patrol (business districts, outside of business districts, etc.). The frequency of patrols may or may not be the same as that for natural gas.
This topic will be addressed by ASME B31.12.
Standards for patrolling (including frequency of patrol) of hydrogen distribution systems must be established and incorporated by reference into the federal code.