Nace Rp: 0391 Pdf

When searching for the standard, you will likely notice two different acronyms: and SP0391 .

However, some limitations of the RP include:

: You can buy the authorized digital version through the AMPP Store or the Accuris Standards Store.

: Broadly covers 90% to 100% commercial concentrated sulfuric acid. It does not apply to diluted acid concentrations below 90% or to oleum (fuming sulfuric acid containing free sulfur trioxide). nace rp 0391 pdf

One of the standard's more specific warnings is about . This is a form of localized attack on vertical or inclined walls exposed to the liquid phase. It is caused by hydrogen bubbles evolving from the corrosion reaction, moving along the wall, and deteriorating the protective film, leading to deep grooves. To mitigate this, the standard recommends considering anodic protection for critical carbon steel vessels and piping.

NACE RP0391 PDF: Guide to Materials for Handling Concentrated Sulfuric Acid The handling and storage of sulfuric acid ( H2SO4cap H sub 2 cap S cap O sub 4

High nickel and copper content provides resistance across wider velocity and concentration shifts. When searching for the standard, you will likely

This passive film is structurally weak. If the fluid velocity exceeds roughly 2 to 3 feet per second (0.6 to 0.9 m/s), the flowing acid mechanically shears the film away, causing rapid, catastrophic corrosion rates. Stainless Steel and High Alloys

Handling concentrated sulfuric acid requires precision to avoid catastrophic material failure and safety risks. For years, was the industry benchmark for selecting materials for these high-risk environments.

| Document | Format | Year | Publisher | Key Page Details | | :--- | :--- | :--- | :--- | :--- | | | PDF (16 pages) | 2016 | NACE International / NORMADOC | 19 | | NACE RP0391-2001 | PDF (13 pages, 77 KB) | 2001 | NACE International / Norm Library | 20 | | NACE RP0391-2001 | PDF (13 pages, 77 KB) | 2001 | NACE International / Standards Global | 9 | It does not apply to diluted acid concentrations

: High-temperature baked phenolic coatings are recommended for protecting smaller storage tanks in the 90-98% range. OSTI (.gov) Related Standards NACE SP0294

The most recent version, SP0391-2016 , can be purchased from authorized retailers like the ANSI Webstore or Intertek Inform .

Includes information on high-temperature baked phenolic coatings and the use of plastics like PVC, PVDF, and polyethylene for specific concentrations. GlobalSpec Standard Evolution Original Issue: First prepared in 1991 as Major Revision: Revised in 2001 as RP0391-2001 Current Active Version: The standard was reaffirmed and renamed to SP0391-2016

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