Silica 

Silicates are forming silicate deposits, while the present a kind of volatility.

So an amount of silica escapes to the steam, and when steam condenses, it is deposited as pure solid silica..

For low pressure boilers, we suggest you to use the relationship:

 NCmax=120/SiO2 (MU)

 SiO2 (MU) is the concentration of silicates in the make-up water (as ppm of equivalent SiO2.).

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