Re: Why not 0 TDS for boiler water ?

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Posted by J. on April 27, 2000 at 20:13:58:

In Reply to: Why not 0 TDS for boiler water ? posted by Mike on April 25, 2000 at 08:00:22:

: Besides the cost of trying to maintain 0 TDS in the boiler water, are
: there any other reasons why 0 TDS is not desirable ? Is a certain level
: of TDS actually required in the boiler water ?

Because even with this clean water in the boiler, your steel boiler will be corroding faster than you could imagine it would. Clean water is not enough for these steel alloy boilers. You would need to increase the alkalinity of your water to prevent this corrosion. I think that the Betz Handbook shows a graph of corrosion rates vs pH for steel at elevated temperatures. You need to keep that boiler in the 10 to 11 range of pH to minimize the corrosion rate. Even with RO and DI water you will increase your delivery rate of your source of alkalinity for the boiler. The most important reason for not having 0 TDS is the corrosion of your boiler due to this pure water. Many plants use ultra pure water, but they are using different types of material also.

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