Inhibition of Top of the Line Corrosion (TLC) in the multiphase natural gas pipelines remains unsolved in spite of numerous researches. The majority of studies in the area are still at the laboratory testing and screening phase. It is assumed that the effectiveness of the injected corrosion inhibitor strongly depends on its volatility. On the other hand, the harsh conditions of top of the line (TOL) application, including low pH of freshly condensed water and elevated temperature and pressure, require a strong affinity between the inhibitor molecule and the material of the pipe. A variety of compounds were selected based on their physical-chemical properties and the available data on the mechanisms of corrosion prevention. Testing includes the evaluation of corrosion inhibition of carbon steel at 70°C with pH4 condensate, with and without the flow of carbon dioxide. It was found that azoles, certain acetylene alcohol, and a “green” volatile aldehyde provided the best potential for TLC prevention.

Subject
Acids, Acid inhibitors, Corrosion rate, Top of the line corrosion, Scale inhibitors, Volatile corrosion inhibitors, Vapors, Acidity, Corrosion scales, Corrosion inhibitors, Steel, Pitting, Corrosion protection
Keywords:
Inhibitor, corrosion protection, top of the line, natural gas pipeline, corrosion rate
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2013
Association for Materials Protection and Performance (AMPP)
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