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The AAPG/Datapages Combined Publications Database
Australian Energy Producers Journal
Abstract
Vol.
https://doi.org/10.1071/EP24254
Determination of maximum allowable water content for CO2 pipelines
ABSTRACT
The design consideration for carbon dioxide (CO2) transportation via pipeline from different emitters necessitates the need to develop a CO2 fluid specification at pipeline entry with defined impurity bands, particularly concerning the water (H2O) content. The presence of CO2 can lead to corrosion in carbon steel pipelines. Under-saturated water can also cause pitting corrosion when CO2 interacts with acid-forming impurities. A logic chart that considers CO2 rich mixture fluid components, operating scenarios and water conditions is developed to aid in determining the maximum allowable water content. Fluid components such as triethylene glycol (TEG), even in trace amounts, should not be overlooked as it can decrease the water solubility of CO2 and increase corrosivity in the material. A fine balance should be made when setting the water content specification at pipeline entry as this can influence the choice of the dehydration technology and indirectly affect project 
economics
.
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