Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Figure 3. Rinse water flow dilution rates. Figure 4. Parts rinsed in tank every 10 minutes vs. single rinse. Figure 1 shows a rinse tank system with multiple rinses but with no coun- terflow rinsing on any of the neighboring rinse tanks. In this example, if each rinse tank is a flowing rinse, the total water use is 12 gallons per minute (gpm). There are two means of reducing the water use in rinsing without reducing the flow rate in each tank. The first is called counterflow or countercurrent rinsing, where the relatively clean rinse water from the second rinse in a rinse tank pair is flowed to the more contaminated primary rinse tank. Therefore, cleaner water is always moving to less clean rinse tanks. The cleanest water is still used 565

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