PHMSA is proposing to make the following changes to the hazardous liquid pipeline safety regulations: (1) Repeal the exception for gravity lines; (2) Extend certain reporting requirements to all hazardous liquid gathering lines; (3) Require inspections of pipelines in areas affected by extreme weather, natural disasters, and other similar events; (4) Require periodic assessments of pipelines that are not already covered under the integrity management (IM) program requirements; (5) Expand the use of leak detection systems on hazardous liquid pipelines to mitigate the effects of failures that occur outside of high consequence areas; (6) Modify the IM repair criteria, both by expanding the list of conditions that require immediate remediation and consolidating the timeframes for remediating all other conditions, and apply those same criteria to pipelines that are not subject to the IM requirements, with an adjusted schedule for performing non-immediate repairs; and, (7) Increase the use of inline inspection tools by requiring that any pipeline that could affect a high consequence area be capable of accommodating these devices within 20 years, unless its basic construction will not permit that accommodation. (8) Other regulations will also be clarified to improve compliance and enforcement. These changes will protect the public, property, and the environment by ensuring that additional pipelines are subject to regulation, increasing the detection and remediation of unsafe conditions, and mitigating the adverse effects of pipeline failures. This rule responds to a congressional mandate in the 2011 Pipeline Reauthorization Act (sections 5, 8, 21, 29, 14); NTSB recommendation P-12-03 and P-12-04; and GAO recommendation 12-388.