Standard Practice for On-Line Determination of Cation Conductivity in High Purity Water

Importancia y uso:

5.1 Cation conductivity provides one of the most sensitive and dependable on-line means of detecting anionic contamination in the boiler/steam cycle, such as chlorides, sulfates, nitrates, bicarbonates, and organic acids, such as formic and acetic.

5.2 High sensitivity is provided by intentionally eliminating the pH adjusting treatment chemical(s), for example, ammonia and amines, from the sample and converting remaining salt contaminants into their acid forms which are approximately three times as conductive.

5.3 Guidelines on cation conductivity limits for various cycle chemistry and boiler types have been established by EPRI (2-4) and by ASME (5 and 6).

5.4 The sample effluent from the cation exchange column also may be used, and in some cases is preferred, for ion chromatography or other anion measurements.

Subcomité:

D19.03

Volúmen:

11.01

Número ICS:

13.060.60 (Examination of water for physical properties)

Palabras clave:

boiler cycle chemistry; cation conductivity; on-line; process measurement;