"Cooking a Vessel"
Have you ever heart of this term in Process Engineering ???
This term probably mean heat up (and circulate when possible) a solution inside a dirty or impure vessel for the sake of dissolving or simply rinsing out the internals prior to sweeping it with a semi-pure fluid and conditioning the vessel for production service.
This is a necessity when you done internal work inside a distillation column, for example, during an annual turn-around and there are traces of grease, oils, and gasket adhesive and other "goodies" inside the assembled and repaired internal parts. In order to ensure that all these impurities are not mixed in with the finished product, the column, reboiler, condenser, associated vessels and all their internals are "cooked" with a hot fluid - usually a solvent or a hot caustic solution - in order to rinse and sweep out all undesired impurities left in the vessels after human entry.Other Forum members may have the same terminology for other techniques used in their plants.
Source : Art Montermayor
During precommissioning / commisioning phase, some system may required acid cleaning in order to remove grease, oil, corrosion stuff, welded slag, etc. Through acid cleaning, it may oxidize metal surface layer so that it form a strong and corrosion resistance layer for vessel protection. Sometime, it called passivation and "cooking a vessel" in layman term.
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