Large Sulfuric Acid and Phosphoric Acid Storage Tank Design and Inspection

A: That's the most common mistake — assuming higher acid strength always means higher corrosion. With concentrated sulfuric, carbon steel passivates and behaves well until you accidentally dilute it. The real threat shows up during rain ingress, line flushing, or startup when concentration drops and uniform metal loss accelerates fast.

A: That's the most common mistake — rushing to fill because everyone’s afraid of moisture. You need to prove the lining integrity dry, then confirm the pressure boundary with water while you can still fix things. Skipping or reordering those steps turns a manageable defect into an unplanned outage.

A: That's the most common mistake — thinking in terms of hydrocarbons. Phosphoric acid won’t boil off, but warmer acid expands and breathes more, pushing mist through undersized vents. If the vent was sized on outdated assumptions, you’re looking at emissions and roof damage, not thermal runaway.

A: That's the most common mistake — overestimating what stainless can tolerate. Fluorides chew through passive films and turn 316L into a maintenance problem fast. A lined steel tank keeps the chemistry away from the metal and accepts that the lining is the sacrificial element.