Nace Rp - 0391 Pdf

: The official AMPP website provides the latest SP0391-2016 version.

Materials must transition from hot reservoir fluids (often exceeding 100°C) to near-freezing seabed temperatures (around 4°C).

This layer passivates the underlying steel and drops the uniform corrosion rate down to acceptable industrial levels (< 5 mpy / 0.13 mm/y). However, this protective layer is fragile and highly susceptible to mechanical disruption. Critical Engineering Risks

This technique is often effective in mitigating corrosion and hydrogen grooving. nace rp 0391 pdf

Advanced proprietary alloys provide excellent erosion-corrosion resistance, especially in areas with turbulent mixing or high thermal shifts. Preferred for Gaskets & Internal Seals

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)

(reaffirmed as NACE SP0391 ) is the definitive global engineering standard for selecting materials and designing piping systems, storage vessels, and equipment for commercial concentrated sulfuric acid ( H2SO4cap H sub 2 cap S cap O sub 4 : The official AMPP website provides the latest

It is important to note that NACE/AMPP standards are copyrighted intellectual property.

Fe+H2SO4→FeSO4↓+H2↑Fe plus H sub 2 SO sub 4 right arrow FeSO sub 4 down arrow positive H sub 2 up arrow

High-velocity zones, control valves, pump impellers, and critical instrumentation. Material Classes: and critical instrumentation.

Handling concentrated sulfuric acid presents unique challenges due to its physical properties:

This guide summarizes the key considerations and materials selection criteria outlined in the standard for concentrated acid ( concentration).

For storage tank fabrication and internal inspection, use this standard alongside NACE SP0294 (Design, Fabrication, and Inspection of Concentrated Sulfuric Acid Storage Tanks).

Used for subsea manifolds and tubing due to high pitting resistance.