Nace Rp 0391 Pdf: 'link'

: It identifies specific risks like hydrogen grooving—localized vertical tracks caused by rising hydrogen bubbles that eat through protective films in tanks and pipes.

: Sulfuric acid forms a protective iron-sulfate film on steel. The standard explains that high-velocity flow (over 0.9 m/s) can physically strip this film away, leading to "erosion-corrosion". nace rp 0391 pdf

An existing pump handling 94% $H_2SO_4$ fails every six months. nace rp 0391 pdf