In this article, a generic engineering critically assessment is discussed and the specific requirements for CO 2 pipelines, transporting captured impure CO 2 are highlighted. The failure assessment diagram methodology is proposed in the engineering critically assessment in order to incorporate the dominant failure modes, i.e. brittle and ductile failure, and assess the safety and acceptability of the assets. In this article, the likely damage mechanisms are identified, among which are corrosion, stress corrosion cracking, cleavage, ductile failure and the effect of general ageing. All of these mechanisms and contributing factors to the damage of CO 2 pipelines are integrated through a novel engineering critically assessment. Areas where these mechanisms for captured CO 2 pipelines differ from natural gas pipelines are elucidated and relevant recommendations as to the safe application of these models are made.

Critical Urban Infrastructures are always a crucial concern to any governments and their decision makers. Infrastructures based on the current demographic trend, future cities will provide residence for almost 70% of total global population in a few decades. However, we stand at a crossroad, that cities must change radically to achieve long-term sustainability and survivability. Shortage of energy, food and water resources, inadequate public transportation systems and other basic infrastructures, will constrain the 5

Critical Urban Infrastructures are always a crucial concern to any governments and their decision makers. Infrastructures based on the current demographic trend, future cities will provide residence for almost 70% of total global population in a few decades. However, we stand at a crossroad, that cities must change radically to achieve long-term sustainability and survivability. Shortage of energy, food and water resources, inadequate public transportation systems and other basic infrastructures, will constrain the 5