The Pipeline and Hazardous Materials Safety Administration (PHMSA) has published an Advanced Notice of Proposed Rulemaking (ANPRM) requesting comments on existing requirements for gas transmission pipelines following population growth.  This notice is the result of previous Agency requests for comment, Congressional mandates, Agency workshops, and industry comments dating back nearly a decade.  The proposed rulemaking could provide industry with additional options when population increases trigger class location changes, and thereby avoid costly pipe replacement or pressure testing.