: Must maintain very low fluid velocity (typically below 0.6 to 0.9 m/s or 2 to 3 ft/s ) to prevent the protective sulfate film from eroding.
Historically used for their resistance, though lead is less common today due to environmental and health concerns. Design and Maintenance Best Practices
Over time, NACE International updated its nomenclature system, transitioning "Recommended Practices" () to "Standard Practices" ( SP ).
The document specifies exact grain sizes and phase balances for duplex stainless steels. Incorrect processing destroys the corrosion resistance of these metals. Materials Covered in the Document nace rp 0391 pdf
Cement Mortar Lining (CML)
Guide to NACE SP0391: Materials for Concentrated Sulfuric Acid Storage
Originally designated as a Recommended Practice (), NACE International updated the naming convention to Standard Practice ( SP0391 ). The document serves as an essential framework because a universal global code for sulfuric acid handling does not exist. Key Standard Parameters : Must maintain very low fluid velocity (typically below 0
High tensile stress combined with corrosive fluids causes rapid cracking. RP0391 defines testing protocols to identify SCC-resistant alloys. 2. Hydrogen-Induced Stress Cracking (HISC)
Frequently utilized for specialized valves and robust thick-walled process piping. Brittle failure risks must be engineered out. Excellent for Intermittent/High Flow
Sites like Scribd often host community-uploaded copies, though these may be older versions (e.g., 2001 or 2004) and require a subscription to download. Summary of Key Content The document specifies exact grain sizes and phase
Note: Downloading unauthorized or "free" PDFs from file-sharing websites poses significant risks, including outdated information, missing addenda, and corporate compliance violations. Conclusion
is a standard recommended practice 1.2.4 . It was developed to provide guidance on the selection of materials for tanks, piping, and related equipment. Original Publication: 1991 (NACE Task Group T-5A-18) 1.2.3 . Revision: 2001 (reaffirmed and revised to SP0391) 1.2.4.
: Tanks must be designed to minimize moisture ingress to prevent "hydrogen blistering" or thinning at the liquid-air interface. 2. Piping Systems
NACE RP0391 is a standard developed by NACE International (the National Association of Corrosion Engineers), a globally recognized authority in corrosion prevention and control. The "RP" in its designation stands for , a class of NACE standards that provides procedures, guidelines, and methods for performing a specific task or selecting materials, without being as prescriptive as a code. The current and active version of this standard has been re-designated as NACE SP0391-2016 , where "SP" signifies Standard Practice , reflecting an update in NACE's nomenclature while retaining the same technical intent.