Nace Rp 0391 Pdf -
: All weldments must be thoroughly inspected for defects like slag, porosity, or laps, as these can initiate rapid localized corrosion.
: Specifically covers the design, fabrication, and inspection of sulfuric acid storage tanks.
: The standard is intended for stationary storage tank systems, including internal piping and associated recirculation loops. 2. Carbon Steel: The Primary Material
: When carbon steel contacts concentrated acid, it initially corrodes but quickly forms an insoluble sulfate layer that limits further attack.
: A specific localized attack mentioned in the standard is "hydrogen grooving," caused by the movement of hydrogen bubbles along vertical walls, which prevents the stable formation of the protective film. 3. Key Design and Maintenance Requirements
: All weldments must be thoroughly inspected for defects like slag, porosity, or laps, as these can initiate rapid localized corrosion.
: Specifically covers the design, fabrication, and inspection of sulfuric acid storage tanks.
: The standard is intended for stationary storage tank systems, including internal piping and associated recirculation loops. 2. Carbon Steel: The Primary Material
: When carbon steel contacts concentrated acid, it initially corrodes but quickly forms an insoluble sulfate layer that limits further attack.
: A specific localized attack mentioned in the standard is "hydrogen grooving," caused by the movement of hydrogen bubbles along vertical walls, which prevents the stable formation of the protective film. 3. Key Design and Maintenance Requirements
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