If they are using this boiler for steam applied to prime movers (turbines, pumps, etc.), then yes, silica is a major issue as the pressure rating goes up.  I agree with other comments as well.  If the steam is used only for heat, then not so much, although I would suspect considerable fouling of heat exchange surfaces in the boiler from the contaminants you mentioned.

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If they are using this boiler for steam applied to prime movers (turbines, pumps, etc.), then yes, silica is a major issue as the pressure rating goes up.  I agree with other comments as well.  If the steam is used only for heat, then not so much, although I would suspect considerable fouling of heat exchange surfaces in the boiler from the contaminants you mentioned.