Sp0170 Pdf 2021 — Nace

is a Standard Practice published by NACE International (now merged into AMPP ) titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment" .

When these alloys are exposed to temperatures between 425°C and 815°C (797°F to 1500°F)—either during high-temperature refinery operations or welding—chromium carbides precipitate along the grain boundaries. This depletes the adjacent areas of chromium, leaving the grain boundaries highly susceptible to localized corrosive attack by polythionic acids. nace sp0170 pdf 2021

In the refining and petrochemical industries, the reliability of equipment during shutdowns is critical. One of the most severe corrosion threats during these periods is . NACE SP0170 (now commonly referred to by its latest revisions, including updates up to 2021) provides the industry-standard practices for mitigating this threat. is a Standard Practice published by NACE International

The PDF includes mandatory requirements for: In the refining and petrochemical industries

SP0170-2021 applies to: