Nace Sp0170 Pdf ^new^ -
Utilizing stabilized grades of stainless steel, such as Type 321 (stabilized with titanium) or Type 347 (stabilized with niobium), helps prevent sensitization. These stabilizing elements bind with carbon at high temperatures, preventing chromium depletion at the grain boundaries.
Understanding NACE SP0170: Protection of Austenitic Stainless Steels from Polythionic Acid Stress Corrosion Cracking
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| Standard | Focus | Key Difference from SP0170 | | :--- | :--- | :--- | | | Weld protection (sulfidation) & polythionic acid SCC | For welds on carbon steel in high-temp sulfur service. | | NACE MR0175/ISO 15156 | Materials resistant to H₂S (sour service) cracking | For wet H₂S (low temp), not hot sulfidation. | | NACE MR0103 | Materials for sour refining environments | For general refinery sour service, not specifically weld overlay. | | API RP 939-C | Sulfidation corrosion in refinery components | A broader guideline; SP0170 is more prescriptive for weld protection. |
The standard outlines several strategies to prevent the formation of polythionic acid or protect the metal surface during shutdowns:
While we cannot reproduce the entire copyrighted standard here, a legitimate will detail these critical steps: Utilizing stabilized grades of stainless steel, such as
—a common scenario when equipment is opened during a turnaround. Intertek Inform Key Mitigation Methods
A positive pressure must be strictly maintained throughout the entire shutdown period to prevent air from leaking into the system. 2. Alkaline Chemical Washing (Soda Ash Solution)
Begin nitrogen purging before the metal temperature drops below the dew point to prevent initial condensation. Environmental Exclusion “I’m looking at SP0170 right now
: Provides both the PDF and printed editions . Document Scope & Contents
NACE SP0170-2018 is the current reaffirmed version available from AMPP .
