By following the guidelines outlined in NACE SP0170 PDF, industries can prevent corrosion and ensure safety, environmental protection, and cost savings.
NACE SP0170 serves as the definitive global engineering standard for preventing this specific failure mechanism during non-operational periods. It provides operating companies, inspection personnel, and maintenance contractors with clear, actionable procedures to safeguard equipment from the moment a unit begins cooling down until it is safely brought back online. The standard applies to:
If you are planning an upcoming refinery turnaround or need to draft a formal facility procedure, tell me:
: Guidance on fabrication practices to reduce susceptibility. Nitrogen Purging : Using dry nitrogen to exclude oxygen. nace sp0170 pdf
Official copies can be acquired directly through the AMPP Store or via institutional standards databases (such as IHS Markit or Techstreet). Conclusion
: Utilizing dry air or nitrogen to prevent liquid water from forming on surfaces.
Begin nitrogen purging before the metal temperature drops below the dew point to prevent initial condensation. Environmental Exclusion By following the guidelines outlined in NACE SP0170
Engineers realized they couldn't just use "stronger" steel. In sour environments, harder steel actually cracks faster. They needed a playbook for protection.
Table of Contents. 1. General. 2. Selection of Materials and Fabrication. Practices. 3. Dry Nitrogen Purging to Exclude Oxygen. 4. Intertek Inform
To get the most out of NACE SP0170 PDF, industries should follow best practices for implementation. Some of these best practices include: The standard applies to: If you are planning
While SP0170 focuses heavily on operational procedures, it also references material selection as a primary defense.
The standard outlines several strategies to prevent the formation of polythionic acid or protect the metal surface during shutdowns:
Focuses specifically on austenitic stainless steels and austenitic alloys during shutdown.
To mitigate this catastrophic risk, the Association for Materials Protection and Performance (AMPP)—formerly NACE International—published the standard . This comprehensive guide explores the technical foundations of NACE SP0170, the mechanism of polythionic acid attack, and industry best practices for protecting vital plant assets during downtime. What is NACE SP0170?