It is important to note that NACE International merged with SSPC to form . When searching for the latest version of this document, you may find it listed as AMPP SP0391 . While the technical core remains consistent with the original RP, the updated versions often include more modern alloy data and refined testing methodologies. Conclusion
If you need to implement these standards for an upcoming subsea project, let me know:
The 2016 edition was officially re-designated as (formerly RP0391) and is maintained by Task Group TG 372. The change from "RP" (Recommended Practice) to "SP" (Standard Practice) reflects NACE International's broader standardization efforts. According to the official NACE Store , the current active standard is NACE SP0391-2016 , and all previous editions (including RP0391-2001 and RP0391-91) are now listed as historical versions.
) at ambient temperatures, defined as up to . It focuses on the concentration range of 90% to 100% by weight , a range where the acid's chemical behavior varies significantly. nace rp 0391 pdf
A specific form of attack on vertical walls caused by rising hydrogen bubbles that disrupt the protective film.
The document is a technical guide for engineers and maintenance personnel. It provides specific recommendations for selecting materials, primarily , for systems that handle commercial concentrated (90% to 100%) sulfuric acid at ambient temperatures (up to 50°C or 120°F).
To develop a software feature based on (now updated to NACE SP0391 ), you should focus on automating material selection and risk assessment for handling concentrated (90% to 100%) sulfuric acid ( H2SO4cap H sub 2 cap S cap O sub 4 ) at ambient temperatures. Core Feature Concept: The "Acid-Safe" Materials Selector It is important to note that NACE International
The AMPP Product Store provides authorized digital access to the full, updated standard. 🧪 The Sulfuric Acid Corrosion Paradox
: As carbon steel corrodes slightly to form the passive layer, molecular hydrogen bubbles are generated. As these bubbles rise vertically along the interior walls or structural nozzle corridors of a vessel, they track a path that mechanically sweeps away the iron sulfate film. This leaves deep, sharp vertical tracks known as hydrogen grooving . Nace RP0391 | PDF - Scribd
: High velocity or localized turbulence (near elbows, tees, or valves) strips away the iron sulfate film, exposing bare steel to rapid, catastrophic erosion-corrosion. Hydrogen Grooving Conclusion If you need to implement these standards
You will find the principles of RP 0391 applied in:
Disclaimer: This blog post is for informational purposes only. Always consult the official AMPP documentation and a qualified corrosion engineer for specific project requirements.
