). 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
NACE RP0391 PDF: A Comprehensive Guide to Materials for Concentrated Sulfuric Acid Storage
(The exact table of contents and wording depend on the edition; consult the official PDF for authoritative requirements.) nace rp 0391 pdf
: These are subject to environmental cracking; use requires careful review as risk increases with acid concentration and temperature.
The standard establishes distinct design boundaries to guarantee mechanical integrity: NACE RP0391 dictates design practices to minimize stagnant
The document (re-designated as AMPP SP0391 ) is the industry standard for the design and selection of materials for handling and storing commercial concentrated sulfuric acid ( H2SO4cap H sub 2 cap S cap O sub 4 ) at ambient temperatures.
Verifying that existing infrastructure meets industry-recognized benchmarks. ). In low-flow or stagnant conditions
The standard details three primary joining methods for FRP: