Pipeline Transportation of Carbon Dioxide Containing Impurities
7 Pipe Material Selection and Fracture Control
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Despite the very different properties of CO2, relative to natural gas, conventional pipeline materials and construction practices can be used provided certain basic precautions are observed. Clearly, the most important of these is to ensure that no free water is present in the system (see Chapter 3) since the formation of carbonic acid can lead to extremely aggressive corrosion wherever the steel internal surface is directly exposed. This requires limits on water content that are appropriate to prevent formation of free water under the most stringent operating conditions; potential upset conditions also need to be considered. In addition to very...