What specific are you designing (e.g., risers, manifolds, fasteners)?

: Focuses on storage tanks, piping, and handling equipment used in industrial chemical processes. ANSI Webstore Material Recommendations from the Standard Carbon Steel

NACE RP0391, officially titled provides guidelines for selecting materials, such as carbon steel, to store and handle commercial-grade sulfuric acid. It covers ambient temperatures up to ), which includes risks from solar heating. Key Aspects of the Standard

Extreme external pressure increases the mechanical load on subsea equipment.

By using the official, current version of NACE SP0391, you ensure that your storage tanks, piping systems, and pumps are designed to last decades, not days.

: Successfully used for piping where concentrations are below 96%. : Suitable for concentrations up to 98%.

: Suggests venting or desiccant systems for storage tanks to prevent atmospheric moisture from diluting the acid and causing "vapor space corrosion". 3. Output & Risk Alerts

: The iron sulfate film is soft. If the fluid velocity exceeds roughly 0.6 to 0.9 m/s (2 to 3 ft/s) , or if turbulent zones exist (such as down-stream of valves and elbows), the fluid washes away the passive film. This continuously exposes raw steel, triggering accelerated, catastrophic erosion-corrosion.

: Specifically covers the design, fabrication, and inspection of sulfuric acid storage tanks.

Carbon steel relies on a "passive" layer to resist sulfuric acid. If the flow velocity exceeds roughly 2–3 feet per second (fps), this layer can be mechanically eroded. The RP provides guidance on where steel is appropriate and where high-silicon cast irons or specialized stainless steels (like Alloy 20) must be used. 2. Temperature Limitations

: Offers NACE RP0391-2001 for those needing historical compliance data.

: Defined as "ambient," which the standard interprets as temperatures up to 50°C (122°F) Target Systems

Whether you are designing a new storage facility or maintaining an existing one, adhering to the guidelines in is vital. The technical specifications regarding material compatibility with concentrated sulfuric acid provide the necessary framework to prevent equipment failure and ensure a safe working environment.