Cooling water is one of the most essential utilities in a chemical plant. Although most of the water used in the plants is chemically treated, equipment failures and problems still occur. The delicate balance between corrosion inhibition, deposition management and microbiological control of the cooling water requires the close attention of the water treatment and corrosion personnel. The tightening of environment regulation, the increasing cost of securing water resource and the disposing of blow-down water also make the work more challenging. Included in the presentation are a few case histories of cooling water related equipment failures. They help demonstrate

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