Part 2: Experimental Methodology as Applied to Tricalcium Phosphate

By Daniel J. Robinette, P.E.

COOLING COOLING TOWERS DEPOSITION SATURATION INDEXES SCALING

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Abstract

as mentioned in Part 1 of this series, the experimental methodology that went into the development of the Robinette Dynamic Precipitation Indicator for tricalcium phosphate (RDPI-TcP) was initially developed by D. Hawthorn (1) while working towards his doctoral thesis at Nottingham Trent University in the United Kingdom from 1991 to 1995. The author first learned of Hawthornメs work through paper IWC 95-14 (2) that introduced the concepts and some of the results that were discovered through his research. Hawthornメs research showed that the mechanism of scale formation follows a two-part production process (1). The first part is precipitation, and the second part is adhesion. The new precipitation indicator methodology described herein is based on the precipitation part of the two-part mechanism. The adhesion methodology applies strictly to scale formation within heat exchanger tubing, particularly power plant surface condensers.

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