NACE SP0170 outlines procedures to protect austenitic stainless steels from polythionic acid stress corrosion cracking (PTA SCC) during refinery equipment shutdowns, downtimes, and startups. Key mitigation methods include dry nitrogen purging, alkaline washing, and dry air purging to prevent the formation of acids that cause rapid cracking. For the full standard, visit
For massive turnaround projects where equipment must be open to the atmosphere for extended periods, the internal metal surfaces must be chemically neutralized.
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Whether you are establishing a lay-up procedure for a turnaround or investigating a failure, this standard provides the roadmap you need. Don’t rely on guesswork—get the standard, study the prevention methods, and protect your assets.
Purge system with dry hydrogen/nitrogen to remove volatile hydrocarbons. Safety and surface preparation. Don’t rely on guesswork—get the standard, study the
When exposed to sulfide corrosion products (formed during operation) + oxygen + water, these sensitized materials form polythionic acid ( H2SxO6cap H sub 2 cap S sub x cap O sub 6
Official copies can be acquired directly through the AMPP Store or via institutional standards databases (such as IHS Markit or Techstreet). Conclusion Don’t rely on guesswork—get the standard
Detailed guidelines on when and how to purge, wash, or treat equipment.
The (Standard Practice) provides crucial guidelines for protecting austenitic stainless steels and other austenitic alloys from Polythionic Acid Stress Corrosion Cracking (PTA SCC) . This type of corrosion typically occurs during the shutdown of refinery equipment when sulfide corrosion products react with air and moisture. Key Mitigation Strategies