Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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Page 578 of 707

Typical PLC screen on a CJI automatic hoist system. ules. Either way, the lines should be plumbed with valves, solenoids, city and deion- ized water feeds, with separate drains to cyanide, acid/alkaline, and chrome lines to the wastewater treatment system. Note: every plating facility will need some type of treatment system, unless it's all hauled away and treated off site. The plating line should offer single-point connections after arriving for hook up of the utilities, air, water, or steam, and electricity. Most plating lines are wired "three- phase" wherever possible for energy efficiency savings. Some plating lines are required to provide VFC (variable frequency controls) that vary the speed of the electric motors on the pumps, etc., depending on load requirements. The wastewater treatment system must have many components to accom- modate the plating line, and the plating line designer is usually asked to also quote the wastewater system supporting the plating or anodizing line. Aside from considerations regarding the wastewater treatment methodology of each plating line, the designer must determine just which type of system will be the most effi- cient system for that particular line while satisfying the local permitting laws. CONCLUSIONS The aforementioned factors should offer readers just a few examples of the magnitude of calculations, researching, sizing, etc., that might be required when estimating a new system. If the process line is designed properly to begin with, then the chemistry will have a much better opportunity of being successful. 577

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