Progress: Addressed, Not Adequately
DOT Relevance: 192.706, 192.711 .719
The sections listed above can be found under Subpart M (Maintenance) of 49 CFR 192. The Code states requirements for various types of pipeline repair.
It is important to know what types and extents of damage or leaks can be repaired without replacements being performed.
There are currently several potential repair techniques that may be suitable for hydrogen pipe such as using clock spring techniques or other permanent repair methods.
ASME B31.12 is considering the need for full cylinder replacement for defects that must be repaired.
Standards for repairs of leaks, welds, etc. for hydrogen transmission lines must be established and incorporated by reference into the federal code.