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Posted by bobmarc on March 30, 2009 at 15:23:13:
In Reply to: Re: Iron in the Boiler Water Analysis Testing posted by Warren on December 02, 2008 at 18:14:49:
: : Mike,
: : Are you feeding any kind of anti-corrosion chem. into your main header? You will need to get you pH up to stop corrosion if that is your source of iron.
: : : I am recording over 5 ppm iron in my feedwater. In the past I have found some areas where iron can generate & I have fixed the conditions. I am in the process of installing a test-sample port in the cond. return line of each steam load in order to try to find the source of the iron. Does anyone have any advice that I might be able to use in my "search & destroy" mission?
: : : Thanks! Mike
: There are a number of reasons that you can have iron in your feed water. Clearly having a low ph in the condensate return is one. The pH should be between 7.8 and 8.8! Secondily, you may be experiencing corrosion of your feedwater tank or piping. (I'm assuming you do not have a pressurized dearator)
: When you add make up water you are adding dissolved oxygen which allows the anodic corrosion of the iron. The more fresh water you add the worse the problem will be. Maintaing a sulfite residual, say 5 to 10 ppm in the feed water will stop this problem.
Keep an eye on your condesate return pH I would imagine you are treating your condensate with amines to neutralize the carbonic acid or you will have channeling in your return piping
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