Nace Sp0170 Pdf 2021 __hot__ Jun 2026

The standard provides essential mitigation methods for refinery equipment—such as desulfurizing, hydrocracking, and hydrotreating units—where the risk of PTA SCC is high. PTA SCC typically occurs when metal sulfides on equipment surfaces react with oxygen and moisture during a shutdown, forming polythionic acids that attack sensitized stainless steels. Mitigation Methods Outlined in SP0170

in austenitic stainless steels and related alloys during equipment shutdowns. While the most recent major reaffirmed version is NACE SP0170-2018 nace sp0170 pdf 2021