NACE SP0170 (2018 edition), titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment," is a copyrighted standard available through AMPP. The document provides crucial mitigation methods for refinery equipment, focusing on preventing Polythionic Acid (PTA) Stress Corrosion Cracking (SCC) during shutdowns through techniques like alkaline washing. Purchase the standard at the AMPP Standards Store
The solution must completely wet all internal surfaces via circulation or spraying before the equipment is exposed to air. The alkaline film must remain on the surface throughout the entire shutdown; if it washes away, it must be reapplied. 4. Use of Chemically Stabilized or Low-Carbon Alloys
Several respected online standards retailers are authorized to sell NACE SP0170. These platforms offer a user-friendly interface for purchasing, downloading, and managing your standards library. nace sp0170 pdf
The core document, NACE SP0170, must be integrated into broader integrity management systems. The following are key practical considerations for its implementation:
Understanding the document's evolution is important when sourcing a PDF, as using an outdated version can have severe consequences. NACE SP0170 (2018 edition), titled "Protection of Austenitic
Purge system with dry hydrogen/nitrogen to remove volatile hydrocarbons. Safety and surface preparation.
For refinery professionals and engineers, (now maintained by AMPP ) is a critical standard practice for maintaining the integrity of stainless steel equipment during maintenance periods. The alkaline film must remain on the surface
These are authorized resellers of technical standards. They offer the NACE SP0170 PDF in various formats, including multi-user licenses for corporate use.
NACE SP0170 is a standards-guidance document focused on welding practices for nickel-chromium-molybdenum and nickel-chromium alloys commonly used in corrosive-service equipment (e.g., sour service, hydrogen sulfide exposure). It provides recommendations to ensure weld quality, corrosion resistance, and mechanical integrity for these alloy systems when used in oil, gas, chemical, and related industries.
Liquid water is necessary to dissolve the acid and facilitate the electrochemical cracking process. Keeping the air hyper-dry prevents liquid water condensation on the metal faces. 3. Alkaline Washing (Soda Ash Solutions)
The NACE SP0170 standard remains an indispensable tool for the refining industry. Whether you are planning a major turnaround, developing shutdown procedures, or investigating a past corrosion event, this document provides the definitive methodology for protecting austenitic stainless steel equipment from polythionic acid stress corrosion cracking.