Silica Scaling in Boilers - Lenntech
Silica, in amounts ranging from less than 1 to over 100 ppm, is found in all natural water supplies.In rain hail and snow, silica content range from 1 to 2.8 ppm. In the analyses of various surface and ground waters, silica content range from 1 to 107 ppm.This refers to soluble silica content and not to the silica that may be present in the suspended matter.
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Scale may form as calcium silicate in one boiler and as sodium iron silicate in another. Compared to some other precipitation reactions, such as the formation of calcium phosphate, the crystallization of scale is a slow process. As a result, the crystals formed are well defined, and a hard, dense, and highly insulating material is formed on the
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Steam Purity - WRBA-Western Regional Boiler Association
•Silica –normal saturated steam should be < 20 ppb in most boilers. High pH in the boiler water will reduce silica carryover from the boiler water. Monitor the steam because: •Precipitation of silica forms silicate deposits on the cold end of the turbine that are not water soluble and are very difficult to remove. The deposits may cause
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