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Time-tested and proven methods to control corrosion of oil and gas industry infrastructures (pipelines, facilities, and refineries) include the use of appropriate materials, protective coatings, cathodic protection (CP), and corrosion inhibitors.
Criteria for evaluation, qualification, and selection of materials, coatings and application of CP arequantitative and are typically followed rigorously (Table 1). Standards on these quantitative criteria are established, and in many cases have been adopted by regulatory authorities.
This paper provides an overview of various properties influencing efficacy of corrosion inhibitors including transportability, efficiency, availability, and secondary inhibitor properties (TEAS); highlights various standards available to evaluate these properties; describes status of implementation of these standards; emphasizes the importance of developing standard test methods; identifies the gaps in evaluating inhibitor efficacy; and elaborates an industry effort underway to fill the gaps and to develop standard test methods on corrosion inhibitor evaluation and monitoring.
HISTORICAL DOCUMENT. Designing, fabricating, and/or maintaining carbon steel equipment and piping that is exposed to caustic environments. Incorporates findings of a 1999 survey as they apply to refinery applications.
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Test conditions for evaluation of pipeline and pressure vessel steels. Compares test results from different laboratories of the absorption of hydrogen generated by corrosion of steel in wet H2S.
Austenitic stainless steels are susceptible to caustic stress corrosion cracking (SCC) above 121°C. When sulfides are present in caustic solutions the SCC has been reported to occur at lower temperatures. This paper discusses a study of the role of sulfide in caustic solutions on SCC of austenitic stainless at T=~50°C.