Nace Rp 0391 Pdf Page

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. NACE Standard RP0391-2001 - ANSI Webstore

: 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.

Here's an overview:

For higher velocities or more aggressive conditions, materials such as stainless steels (e.g., 316L or Alloy 20) are recommended, especially for specific piping components where turbulence occurs. Design, Inspection, and Maintenance

Recommendations for inspection frequencies and techniques. Where to Obtain the NACE RP0391 PDF nace rp 0391 pdf

Originally developed in 1991 by NACE International (now merged into AMPP ), the standard was updated as and later reaffirmed as SP0391-2016 .

The standard confirms that carbon steel is the primary material for tanks, piping, and fittings for concentrated $H_2SO_4$, provided the acid concentration remains above 90% and velocity is controlled. This public link is valid for 7 days

: Written specifically for engineering, design, and operations personnel within the chemical process industries (CPI), mining, mineral processing, and industrial water treatment sectors. The Evolution from RP0391 to SP0391

Because sulfuric acid is hygroscopic (absorbs moisture from the air), storage tanks must be sealed. Moisture dilution at the surface of 98% acid can turn it into highly corrosive, lower-concentration acid, damaging the tank roof and vents. NACE RP0391 vs. Other Standards Can’t copy the link right now

The standard—later updated and designated as NACE SP0391 —is the industry-standard consensus practice for the design, material selection, and maintenance of infrastructure handling commercial concentrated sulfuric acid ( H2SO4cap H sub 2 cap S cap O sub 4 ) at ambient temperatures .

: Originally published as a Recommended Practice (RP) by NACE International Task Group T-5A-18.