Nace Sp0170 Pdf 2021 Jun 2026
Are you working on the design, operation, or maintenance of oilfield systems? The 2021 revision of is an essential document for ensuring asset integrity and preventing oxygen corrosion.
). If the alloy is under tensile stress (either residual weld stress or operational load), the acid causes severe, rapid intergranular cracking within a matter of hours. Key Mitigation Strategies Mandated by NACE SP0170
During normal refinery operations (particularly in hydroprocessing, desulfurization, and catalytic cracking units), hydrogen sulfide (
: When the equipment is cooled down and opened to the atmosphere, oxygen ( O2cap O sub 2 ) and ambient moisture ( H2Ocap H sub 2 cap O nace sp0170 pdf 2021
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Pre-Assessment
Application of specific alkaline solutions to internal surfaces. Are you working on the design, operation, or
The primary purpose of the document is to prevent rapid, catastrophic intergranular cracking of refinery equipment during downtime, turnaround, and maintenance phases. It outlines precise procedural options—such as nitrogen purging, alkaline washing, and dehumidification—to isolate susceptible stainless steels from the environmental triggers of PTA SCC. Understanding the Threat: Polythionic Acid SCC
: Covers austenitic stainless steels (300 series) and other austenitic alloys (e.g., Alloy 600, 800, 825) used in refinery services where sulfide scales can form. Protection Methods :
Using dehumidified air to ensure no liquid water can condense, as water is a required "ingredient" for the acid. If the alloy is under tensile stress (either
The is a critical framework used in petroleum refineries to protect austenitic stainless steels from polythionic acid stress corrosion cracking (PTA SCC) during equipment shutdowns.
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PTA is not typically present during normal refinery operations. Instead, it forms during shutdowns or turnarounds when the following sequence occurs:
