PHMSA issued an Advisory Bulletin to provide clarification to gas distribution pipeline owners and operators regarding mechanical fitting failure reports, PHMSA Form 7100.1-2, required under the distribution integrity management regulations (49 CFR Part 192.1009). In particular, with regard to the cause of a leak, PHMSA instructs operators to classify a mechanical fitting failure due to installation defects as “Incorrect Operation” and manufacture, fabrication, material and design defects as “Material Welds / Fusions. Click here for the Advisory (77 Fed. Reg. 34457-34458 (June 11, 2012) ).