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Posted by Vern on July 18, 2002 at 07:45:47:
In Reply to: ammonia and silica in bwtr posted by rajooboiler on July 16, 2002 at 09:15:28:
: 1.effects of ammonia in boiler water?
: 2.effects of silica in boiler water?
: 3.how to test for these(any test methods)?
: 4.what r the limits?
: thanx.
1. Ammonia is used to elevate pH in the condensate system for plants that
can't use amines.
2. In low pressure boilers around 125 psi silica levels can be 150-200 ppm
which is the industry standard. Higher than that level needs higher alkalinities
in the boiler. If silica deposits as scale, it is very difficult to remove. In high
pressure systems silica can volatilize and carryover with steam and deposit on
things like turbine blades.
3. Silica can be easily tested for. Lamotte, Taylor, Hach, Masters all make silica test
kits, ammonia also. As I said, ammonia is used for pH elevation in the condensate system
so the test there is a simple pH test. Levels 8.2 to 8.8 are usually sufficient.