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topic 32750

Water Treatment for Condensate Return


Dear Sir,

We are operating water tube boiler with demineralized water as feed water .

We want to use return condensate as feed water. But we found the pH of the condensate varies between 6 and 7 . We feel that this quality of condensate will harm boiler. what treatment method is to adopted for safe use of condensate

Narayana Rao
- Visakhapatnam, ANDHRA PRADESH, India


The fact that your condensate return has a pH of 6-7 isn't going to hurt the boiler. Most boiler treatments are extremely alkaline in nature so that in and of itself isn't a problem.

What is a problem though is that you don't want your condensate return lines to have a pH that low. At those elevated temperatures, you can get extreme corrosion of the return lines in short order. Most commercially available steam line treatments are added directly to the boiler feed water and they volatilize at steam temperatures. The steam line treatment will then make the condensate alkaline in nature. The pH of the condensate should be between 8-8.5 to prevent corrosion.

Contact boiler treatment chemical suppliers in your area to purchase these materials.

Daryl Spindler
- Nashville, TN


I can give you a good solution if you can provide me some condensate analisys, without eny chemicals use.


Damian Dinu
- Constanta, Romania

April 18, 2012

My condensate water has a pH range of 5-6. Please give me solutions for this problem to upgrade condensate water to normal pH range of 7,5
Thank you


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