According to the abstract on the RegInfo.gov web site for this new rulemaking (RIN: 2137-AE72):
“In this rulemaking PHMSA will be revisiting the requirements in the Pipeline Safety Regulations addressing integrity management principles for Gas Transmission pipelines. In particular, PHMSA will be considering the definition of an HCA ( including the concept of a potential impact radius) and the repair criteria for both HCA and non-HCA.”This rule making was published for the first time in the Spring 2011 Unified Agenda.
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