Case Histories

Effective Rehabilitation Planning for a Natural Gas Transmission Line—Part 1

This article describes the pipeline rehabilitation program developed by the natural gas transmission company in Colombia, South America. Part 1 presents the work accomplished to develop the Effective Rehabilitation Plan (ERP). Part 2 discusses the ERP in detail, including results and accomplishments.

Case History: Preferential Weld Corrosion

Preferential weld and heat-affected zone corrosion is directly proportional to the process flow, temperature, pH, location of welds within the piping, and how active the weld metal is electrochemically when coupled to the base metal. Accelerated decay and possible reasons for this attack are illustrated in this case study.