why we are maintain boiler ph 9.0,not maintain 10.0 or 11?

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why we are maintain boiler ph 9.0,not maintain 10.0 or 11?..

Answer / anindya

Both high and low pH can cause corrosion in boiler. In
acidic range the protective layer of
magnetite is not able to form and it cause corrosion. In
very high pH range the protective layer of
magnetite breaks down and this leads to caustic corrosion.
For corrosion prevention maintaining
proper pH and alkalinity is very important.

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why we are maintain boiler ph 9.0,not maintain 10.0 or 11?..

Answer / friend

magnetite layer is formed in carbon steel at higher
temp.starts at180deg c but rx become fast at >230 deg c.how
much ph is to be maintained, depends upon metal used for
equipment and environment of equipment.

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