Tank cleaning system removes sludge on-line

After the manway is removed and covered with a flexible barrier, the robotic tank-entry device is stabbed through the barrier and bolted to the manway flange to form a vapor-tight seal (Fig. 2). In 1997, British Petroleum Co.'s (BP) Alliance refinery at Belle Chasse, La., successfully removed sludge from a tank without taking it out of service. The refinery used a modified aboveground storage tank (AST) cleaning process for its wastewater-treatment plant.

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