NACE RP0391-91 (1991) was updated in 2001. In February 2017, the standard was redesignated as .
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The acid aggressively absorbs moisture from the atmosphere. Diluted acid is far more corrosive to many common materials than concentrated acid. nace rp 0391 pdf
Materials for handling and storing commercial concentrated sulfuric acid. Concentration Range: 90% to 100%
When carbon steel is exposed to static, ambient-temperature 93% to 98% sulfuric acid, a rapid initial reaction occurs, forming a on the metal surface.
A critical warning in the standard involves galvanic corrosion. Mixing copper-based alloys (brass, bronze) with carbon steel in concentrated sulfuric acid can lead to rapid failure. NACE RP0391 provides a compatibility chart for bolting materials and flanges. NACE RP0391-91 (1991) was updated in 2001
The most recent version, SP0391-2016 , can be purchased from authorized retailers like the ANSI Webstore or Intertek Inform .
Explain the difference between .
NACE International (AMPP) standards are copyrighted documents. Downloading a PDF from a random website, file-sharing forum, or unlicensed repository is illegal and poses professional risks: Transition to AMPP The acid aggressively absorbs moisture
The document provides guidance on using specialized alloys, such as high-silicon cast iron, or specific types of austenitic stainless steels for components where carbon steel may not be appropriate. 3. Safety and Maintenance
The AMPP Product Store provides authorized digital access to the full, updated standard. 🧪 The Sulfuric Acid Corrosion Paradox