NACE
International Corrosion 2013 Conference & Expo - Paper No. 2509
Development
of Corrosion Inhibitors for Prevention of Top of the Line Corrosion (TLC)
Ming Shen, Alla Furman, Rita Kharshan, Tim Whited
Cortec Corporation. St Paul, Minnesota
ABSTRACT
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.
The goal of this study is to evaluate a wide variety of TOL inhibitor
candidates to find TOL inhibitors that are effective in acidic environments.
Free Full Text Source: http://www.cortecvci.com/Publications/Papers/2013-NACE-2509.pdf
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