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Tube scaling

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Posted by Ken Donaldson on May 13, 2006 at 14:28:40:

A couple of years ago the new boss changed our water treatment supplier. We went from phosphate to polymer. Here is my question and please keep in mind that I am not the water treatment tech. 500hp Kewanees with tube scaling. The scale appears to be primarily on the top and sides of the tubes. The scale formation is not uniform around the tubes, rather it looks like (imagination pls) the scale was poured on top of the tubes and hardened as it ran down the sides. the thickest part ot the scale is at about 3 and 9 oclock. Anyway the new chemical folks have been aware of this for a couple of years and say it is not their fault as the scale was caused by the phosphate. They go on to say that it takes a long time to remove it, but now that I am getting upset about it they suggest acid cleaning for about10k. I only do water side inspections annually and am embarrassed that I have allowed this to happen. We never had this problem with our other vendor of 30 years. Unfortunately he had a new man that lost the account for him. Can someone please tell me if what I am being told is true? I did have some condensate hardness issues but my feed water hardness has always been below 1ppm. I will be happy to answer any questions needed for clarification. Thanks, Ken

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