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(reclassified as NACE SP0391 ) is the premier global standard governing material selection and design for handling and storing commercial concentrated sulfuric acid (
NACE RP 0391 is less design-focused and more installation/handling focused, which is why it remains unique.
A common point of confusion is how NACE RP0391 relates to (the global standard for materials in H2Scap H sub 2 cap S -containing environments). NACE MR0175/ISO 15156 focuses broadly on sour service ( H2Scap H sub 2 cap S nace rp 0391 pdf
The direct source. AMPP (The Association for Materials Protection and Performance) manages the NACE standards catalog.
: A range selector specifically for 90% to 100% H2SO4cap H sub 2 cap S cap O sub 4 (reclassified as NACE SP0391 ) is the premier
Designing systems according to NACE RP0391 guidelines involves several structural mandates: System Component Engineering Mandate Failure Prevention Mechanism Large radii bends; no tight 90-degree elbows Minimizes turbulent fluid impingement and localized erosion Velocity Control Kept below 2–3 ft/s for carbon steel
Cracking induced by the combined influence of tensile stress and a corrosive environment (like seawater chlorides). refinery alkylation units
NACE RP0391 (and its active replacement, NACE SP0391-2016) remains the authoritative Recommended Practice for the safe handling, storage, and material selection for concentrated sulfuric acid in the 90–100% concentration range at ambient temperatures up to 50°C (120°F). The standard is essential for chemical processing industries, refinery alkylation units, acid terminals, and any facility that stores or transports commercial concentrated sulfuric acid.