The distribution ratios of the concentrations of silica in steam to those in boiler water were determined over a range of pressures from 300 to 3140 psi, of silica concentrations in the water from 12 to 1000 ppm, and of pH values of the water from 7.8 to 12.1. Mechanical carry-over, determined by using a radioactive tracer, was insufficient to necessitate corrections to the vaporous silica carry-over data at pressures above 500 psi.
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