What is Selective Silica Carry-over?
Silica can carry over into the steam in two ways. It can be present in the steam as the result of general boiler-water carry-over or it can go into steam in a volatile form. In the latter case silica acts much like a gas and is considered to be selec-tively carried over. As Pressures increase above 2760 kPa (400 p.s.i), there is an increased tendency for silica to be selectively carried into the steam in amounts proportionate to the amount of silica in the boiler-water.
