Nace Rp 0391 Pdf < Full Version >
The standard specifically addresses the concentration range of at temperatures ranging from 32°F to 120°F (0°C to 49°C) . It does not cover oleum (fuming sulfuric acid) or dilute acids, which behave completely differently.
). In low-flow or stagnant conditions, hydrogen bubbles rise vertically along the walls of storage tanks or horizontal pipes. As these bubbles travel upward, they displace the protective passive film, creating vertical channels or "grooves" in the steel. NACE RP0391 dictates design practices to minimize stagnant zones and avoid hydrogen grooving. 3. Material Selection Matrix According to NACE RP0391
Metadata covering metals, alloys, and reactive limits.
). For engineering firms, safety officers, and asset integrity managers, downloading the is a critical step in mitigating corrosion risks, preventing catastrophic failures, and remaining fully compliant with international safety practices.
for carbon steel in sulphuric acid.
Note: It is vital to understand that this standard does cover dilute sulfuric acid, which is significantly more corrosive and requires different materials. Why Accessing the NACE RP0391 PDF is Essential
| Standard | Focus Area | Geographic Use | |---|---|---| | | Onshore FRP pipelines, oil/brine/water | North America, Middle East | | ASTM D2996 | Standard specification for filament-wound FRP | Global, manufacturing QC | | API 15HR | High-pressure FRP for oilfield (up to 4,000 psi) | Upstream oil & gas | | ISO 14692 | Petroleum and natural gas industries – FRP piping | Europe, Asia, Offshore | | BS 7159 | Design of FRP piping systems (older UK standard) | United Kingdom |
The standard is intended to assist engineers as well as Chemical Process Industries (CPI) operations and maintenance personnel who are involved in the design, modification, and maintenance of ambient-temperature concentrated sulfuric acid systems and equipment, with key focus areas including design, storage tanks, and acid handling 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. nace rp 0391 pdf
: Sulfuric acid is "thirsty"—it pulls moisture from the air. If the acid becomes diluted by atmospheric humidity, it loses its ability to form that protective iron sulfate layer and becomes much more aggressive toward the steel. ANSI Webstore The Engineer's Toolkit
For a complete safety and design profile, engineers often pair NACE RP0391 with:
It is important to note that NACE/AMPP standards are copyrighted intellectual property.
The industry workhorse for static storage. It relies on a protective ferrous sulfate ( FeSO4cap F e cap S cap O sub 4 ) film that forms naturally. In low-flow or stagnant conditions, hydrogen bubbles rise
Defines where carbon steel is suitable and where corrosion rates become unacceptable.
Fusion-Bonded Epoxy (FBE)
Focused on 90–100% concentration, which is typical for industrial storage and transportation.
Providing a neutral, third-party standard for contractors and suppliers. Transition to AMPP oil/brine/water | North America
