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) mixed with water. A surfactant is frequently added to help the solution penetrate heavy oil or hydrocarbon films covering the sulfide scales.
) during welding or high-temperature process operations, chromium carbides precipitate along the grain boundaries. This depletes the adjacent zones of chromium, rendering them vulnerable to localized corrosion. nace sp0170 pdf 2021
PTA is not typically present during normal refinery operations. Instead, it forms during shutdowns or turnarounds when the following sequence occurs: ) mixed with water
On January 1, 2021, to form the Association for Materials Protection and Performance (AMPP) . Consequently, you may see this document referenced as AMPP SP0170 in the future. However, the technical content of the most current standard (SP0170-2018) has not been superceded by any 2021 version. This depletes the adjacent zones of chromium, rendering
NACE SP0170 (2021) serves as a critical industry standard for protecting austenitic stainless steel equipment from polythionic acid stress corrosion cracking (PTA SCC) during refinery shutdowns. The practice outlines essential mitigation techniques, including nitrogen blanketing and alkaline washing, to prevent failures in sensitized stainless steel. While foundational for safety, modern discussions analyze its application alongside advanced, resistant materials. For further technical details, visit GlobalSpec .
Disclaimer: This article provides a summary of the standard. Always consult the full, official NACE SP0170-2021 document for technical implementation.
To eliminate moisture and oxygen, thus preventing the formation of polythionic acids. 2. Alkaline Washing (Soda Ash Treatment)