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Free keywords:
CO2 transport;
pipelines;
corrosion;
pipe surface topography
Abstract:
Due to lack of relevant field data it is difficult to predict with sufficient accuracy the corrosion rates and CO2 flow in pipelines.
Laboratory experiments are usually of short duration at small scales, failing to reproduce events such as repeated shutdowns. It is therefore important to learn from CO2 storage pilot sites, and the present paper reports characterization of stainless steel pipeline material from Ketzin. It was exposed to CO2 flow for about five years, including several shut-ins, and samples were collected
from straight and bent sections with different proximity to heaters of the injection facility. The samples displayed no visual signs of severe corrosion, but were investigated in detail using scanning electron microscopy and a profilometer. This revealed that prolonged CO2 flow had roughened the inner pipe surfaces and caused some intergranular and pitting corrosion, especially close
to heaters and in bent pipe sections.
