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Posted by Ramesh R on January 25, 2002 at 05:51:57:
In Reply to: Re: Corrosion in Deaerator & Feed Tank posted by Tony Conner on January 24, 2002 at 06:51:06:
: Unless you've got a vacuum DA, you'll need to run something over 100*C to drive off the dissolved oxygen. Something like 105*C would likely do it. I have also seen pitting occur in DAs where the condensate returns to the storage section, instead of to a point where it gets scrubbed. A failed heat exchanger bundle was dumping raw water into the DA, that wasn't getting the oxygen removed.
: If you you're heating un-deaerated water in a carbon steel tank (like your feedwater tank), and/or using carbon steel coils, the oxygen corrosion will just go nuts. It'll pit the carbon steel to death. I've seen installations like this fail in as little as 18 months.
if thats the case what is the recommendation for preventing excessive pitting in the feed water tank..and for your information, we are not using any condensate return(palm oil mill).
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