API RP 939-C, Guidelines for Avoiding Sulfidation (Sulfidic) Corrosion Failures in Oil Refineries, is a recommended practice developed and published by the American Petroleum Institute (API) that provides guidance on avoiding sulfidation corrosion in oil refining operations. This RP was originally published in 2009, and the most recent 2nd Edition was released in January of 2019.
API RP 939-C is directed at integrity professionals managing hydrocarbon process streams containing sulfur compounds, without the presence of hydrogen, that operate at temperatures above approximately 500 °F (260 °C) up to about 1000 °F (540 °C). For hydrogen-containing services, the threshold temperature is set at 450 °F (230 °C).
API RP 939-C provides background information on sulfidic corrosion and discusses the most common types of damage observed. It also covers specific root causes of sulfidation corrosion, methods to predict and monitor the corrosivity of systems, materials selection for new and revamped processes, and inspection and nondestructive examination (NDE) methods used for detecting sulfidation corrosion.
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- International Organization for Standardization (ISO)
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