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topic 464

What is the reason for counterflow rinsing


(1996)

I don't understand exactly the function and advantages of counterflowing rinses. How I can probe that?

Omar Osorno
- Mexico


See Ted Mooney's treatise on the subject, "Water Rinsing", in the Metal Finishing Guidebook, Elsevier Science Inc.

tom pullizzi portrait
Tom Pullizzi
Falls Township, Pennsylvania


(1995)

Get yourself a copy of Water & Waste Control for the Plating Shop, by Kushner & Kushner. Available from Gardner-Hanser Publications. Book has lots of information on water management!

Art Kushner
Art Kushner
Anaheim, California



November 28, 2008

Hi, Omar. Counterflow means that the rinsewater flows counter to the direction the work flows. That is, there will be at least two rinse stages following the process tank, and you will feed fresh water into the final rinsing stage, and it will flow from that tank to the previous rinse tank. The theory being that the slight amount of contaminant from the final rinse will not render that previously used water any less adequate as a first rinse than fresh water would be.

So, if you have a two-stage rinse, you only need half as much water if you counterflow it. If you have a three-stage rinse, you only need one third as much water.

Regards,

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



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