1 Introduction

In the search for new sources of oil and gas, operational activities have moved to harsher environments in deeper high pressure/high temperature wells, remote areas, and deep-water regions. These have created increased challenges for the economy of project development and subsequent operations whereby the integrity of the facilities, optimisation of the materials, and accurate prediction of the materials’ performance are becoming paramount. In addition, the economic moves towards multi-phase transportation through sub-sea completions and long infield flowlines have a tendency to increase the risk of corrosion threats, thus placing a heavier duty on integrity management in upstream operations.