A method for removing black oil residues from tanks is described. The cycle of operations includes ventilation of the tank, removal of existing sludge, steaming at 100 psi until temperature reaches 175-180 F, injection of an emulsion cleaner through a specially prepared jet, injection of cold water, cooling of the tank and washing down with high pressure jets of fresh water. The injector used is described and formula for emulsion cleaner given. Electrolytic descaling is effected by making the inner tank walls the cathode in an electrical circuit moving through a suitable aqueous electrolyte filling the tanks.

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Copyright 1955 by the National Association of Corrosion Engineers.
1955
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