Tank / System (BD tank) Pickling and Passivation
Tank/ system pickling is carried out to remove metal surface impurities like iron oxides, rust, or stain to ensure the surface is rust-free and smooth. This is particularly important and crucial for butadiene (BD) tank storage and pipelines, where the presence of rust, oxygen and water will end up with formation of butadiene polymer, or commonly known as ‘popcorn’. This phenomenon is highly not desired, as the popcorn formation will be in propagation mode once it started and might resulting in occupying the full space and rupture the structure or piping, leading to BD leakages and other unwanted incidents.
Besides, pickling help to remove the surface dirt and rust, leaving the metal surface clean and smooth for passivation to take place. Passivation is a procedure to form a thin film layer of protection to the metal surface, making it more resistant to corrosion. Therefore, it is always good to couple both pickling and passivation process for the best code of practice