Proceedings of the Pipelines 2012 Conference, held in Miami Beach, Florida, August 19-22, 2012. Sponsored by the Pipeline Division of ASCE. This collection contains 141 peer-reviewed papers discussing management, safety, operation, and maintenance issues pertaining to pipeline infrastructure. Papers examine the design, construction, maintenance, and operation of all types of pipelines, including water, wastewater, and natural gas. Because current interest in sustainable infrastructure is high, this collection pays particular attention to managing existing assets and highlights advances in pipeline rehabilitation, risk management, safety, and engineering and construction. Topics include: advances in technology; coastal issues; condition assessment; construction; design management; failure mechanisms; operations and maintenance; pipeline hydraulics and modeling; planning and coordination opportunities; predictive modeling; prestressed concrete cylinder pipe; procurement alternatives; rehabilitative approaches; and trenchless evaluation. These papers will be useful to researchers, engineers, and government officials interested in upgrading the nation's faltering infrastructure.