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Distribution Systems: Patrolling (17.4)

Criticality: Medium
Progress: Addressed, Not Adequately
Score: 12
DOT Relevance: §192.721

Description of Key Area

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.”

Discussion of Criticality

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.

Discussion of Progress

This topic will be addressed by ASME B31.12.

Recommendations

Standards for patrolling (including frequency of patrol) of hydrogen distribution systems must be established and incorporated by reference into the federal code.