Sodium Hydroxide (Caustic Soda Solution) – Cleaning with
Sodium Hydroxide may react with the calcium and magnesium in seawater during tank cleaning operations to form calcium and magnesium hydrates which shows as white powdery deposits left on the cargo tank surfaces, especially when using hot water washing. A freshwater rinse following a caustic recirculation wash prior to the final seawater wash will assist in the prevention of such deposits. Such deposits may be removed by washing with an acid-based cleaner. Washing with a Potassium Hydroxide Solution instead of…