Governed by strict yield strength limits to minimize hydrogen risks. Industrial Impact and Application
Loss of ductility due to hydrogen absorption, exacerbated by subsea cathodic protection. 3. Testing and Qualification Protocols
Cracking caused by the simultaneous presence of tensile stress and H2Scap H sub 2 cap S nace rp 0391 pdf
: Widely used for storage tanks and pipes at these concentrations because it forms a protective ferrous sulfate ( cap F e cap S cap O sub 4
Originally published in 1991 as (Recommended Practice), the document underwent technical revisions in 2001. In later cycles, NACE International adjusted its nomenclature, transitioning "Recommended Practices" (RP) to "Standard Practices" (SP). The most current, updated iteration of this document is available via the Accuris Store as NACE SP0391-2016 . Core Corrosion Mechanics of Concentrated Sulfuric Acid Governed by strict yield strength limits to minimize
Deployed in the most aggressive high-temperature, high-pressure (HTHP) zones.
High velocities can strip the protective iron sulfate layer from steel, leading to localized corrosion. The standard suggests designing piping systems to maintain lower velocities, particularly near inlets. 3. Preventing Moisture Absorption Testing and Qualification Protocols Cracking caused by the
The two standards are often used in tandem at refineries with alkylation units: RP0391 for fresh acid receipt and storage systems, and RP0205 for spent acid handling and regeneration systems.
Cement Mortar Lining (CML)
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Originally published by NACE International, this standard has been updated over the years to reflect advancements in metallurgy and deepwater extraction technology. Following the merger of NACE and SSPC into the , legacy documents like RP0391 are continually integrated into the AMPP standards catalog, often retaining their technical core while transitioning to new naming conventions (such as SP0391). Why is NACE RP0391 Critical for Deepwater Projects?