While NACE International merged with the Society for Protective Coatings (SSPC) in 2021 to form the , the most recent active version of this specific standard was released in 2018 . Key Purpose and Scope
As equipment ages and operating conditions become more severe, the 2021 update—often referenced via the AMPP (Association for Materials Protection and Performance) store—maintains crucial, updated guidelines for mitigating this silent killer of refinery equipment.
The nitrogen must maintain an exceptionally low dew point (typically below -45°C or -50°F) to ensure no liquid water condenses on internal surfaces.
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SP0170 integrates corrosion science and probabilistic risk assessment. Important technical aspects include: nace sp0170 pdf 2021
Will you be for catalyst replacement, or keeping them closed?
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: Latest papers (2025/2026) discussing how SP0170 is evolving to include chemical treatments. AI responses may include mistakes. Learn more
AMPP is already working on updates related to: While NACE International merged with the Society for
The is a critical document for materials, corrosion, and inspection engineers in the refining and petrochemical industries. Its primary focus is the prevention of Polythionic Acid Stress Corrosion Cracking (PTA SCC) in austenitic stainless steels and other high-alloy materials during shutdowns and maintenance.
Hydroprocessing loops operate under deeply reducing conditions with high hydrogen sulfide (
This includes residual stresses from fabrication and welding, or operational stresses remaining in the components.
The standard outlines several proven methods to protect vulnerable alloys during refinery downtime, including the shutdown and startup phases. NACE SP0170-2018 | Source | Price (approx
This is the most common protective measure applied to equipment susceptible to PTA SCC.
Standardized technical documents like NACE SP0170 are copyrighted and typically require a purchase or membership for full access. You can find the official document at: AMPP Store : The official AMPP website offers the 2021 PDF for purchase. ANSI Webstore : Also carries the latest versions of NACE standards. material compatibility charts mentioned within this standard?
For decades, engineers and integrity managers have relied on a single, critical standard to mitigate this risk: (formerly NACE MR0175). The 2021 revision of this standard represents the cutting edge of materials selection for sour service.
To eliminate moisture and oxygen, thus preventing the formation of polythionic acids. 2. Alkaline Washing (Soda Ash Treatment)