: Contain higher nickel and chromium content to withstand broader concentration and temperature swings.
One of the most valuable parts of the PDF is the guidance on inspection. It defines how to check for holidays (pinholes), thickness, and adhesion. Because these linings are often applied in thick films, standard inspection methods for thin-film paints may not apply.
For extreme velocity or slight temperature spikes, proprietary high-silicon stainless steels (e.g., SX alloy) or nickel-base alloys (e.g., Alloy 20, Hastelloy C276) are specified.
Extreme external pressure increases the mechanical load on subsea equipment. nace rp 0391 pdf
for carbon steel to reduce corrosion and maintain acid purity. Linings and Coatings:
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.
To rapidly evaluate a material’s susceptibility to environmental cracking. : Contain higher nickel and chromium content to
NACE RP0391 details how different materials behave in contact with concentrated acid:
: Must maintain very low fluid velocity (typically below 0.6 to 0.9 m/s or 2 to 3 ft/s ) to prevent the protective sulfate film from eroding.
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 Because these linings are often applied in thick
"All materials, design, fabrication, and inspection shall conform to the requirements of NACE SP0391-2016 (formerly RP0391-2001), Materials for the Handling and Storage of Commercial Concentrated (90 to 100%) Sulfuric Acid at Ambient Temperatures."
NACE SP0391 also addresses non-metallic materials. It explicitly warns that PE and PP are prone to in concentrated sulfuric acid. The standard emphasizes that the likelihood of cracking increases with higher acid concentrations and temperature, and mandates a careful review of the long-term performance of these materials before any application.
If you are looking to purchase the document, the WRC Online Store currently lists it for $179.00 1.2.1.