Guide to NACE SP0391: Materials for Concentrated Sulfuric Acid Storage
: Because they lack internal smoothness, threaded or socket-welded piping can cause localized turbulence and accelerated corrosion. Butt-welded or flanged piping is preferred. nace rp 0391 pdf
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. Guide to NACE SP0391: Materials for Concentrated Sulfuric
Searching for a is common, but it is essential to understand the copyright implications. and fittings for concentrated $H_2SO_4$