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Refinery equipment, particularly in desulfurizing, hydrocracking, and hydrotreating units, often uses austenitic stainless steels because of their high-temperature strength and corrosion resistance. However, these materials are highly susceptible to . PTA SCC occurs when: NACE SP0170-2018
Understanding NACE SP0170: Protecting Refineries During Shutdowns
The latest version of the standard for protecting equipment during refinery shutdowns is . While some search for a "2021" version, the 2018 edition remains the current active standard practice.
is a critical standard practice titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment" . It provides essential mitigation methods to prevent catastrophic material failure when refinery units are not in operation. Why This Standard is Essential