plating, anodizing, & finishing Q&As since 1989
Why are layers of polypropylene balls (choffles) used in demineralized water storage tanks?
Q. Abantika Gupta
I have done some projects regarding dm plant. I wanted to know that why pp balls are generally placed in the upper portion of dm water storage tanks?
A. Hi Abantika,
I'm surprised that no one, i.e., no plater or plating engineer, has replied to your question.
Surely the use of floating balls is to prevent evaporation and heat loss or in your case to maybe slow down any sunlight attack ... normally they are made of a standard PP material which, if exposed to the U.V., will deteriorate.
But India came up, some years ago, with a solid PP shape called, I think, a flying saucer.... this was also coloured.
Freeman Newton [deceased]
(It is our sad duty to advise that Freeman passed away
April 21, 2012. R.I.P. old friend).
May 22, 2013
A. Old Theory: PP balls are placed to reduce the diffusion of gases (O2 and CO2; harmful for water-steam cycle) into DM Water.
New: Since PP balls roll on the water surface with thin layer of water on it, the gasses' diffusion rate is higher.
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