Consensus on Operating Practices for the Control of Feedwater and Boiler Water Chemistry in Modern Industrial Boilers (CRTD 34)
4 Organization of Water Chemistry Guidelines
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Consensus water chemistry controls for the six types of steam generator systems are presented in Tables 1 through 6. The tabulated information is categorized according to operating pressure ranges because this is the prime factor that dictates the type of internal water chemistry employed, the normal cycles of feedwater concentration, the silica volatility, and the carryover tendency. The difference between steam and water densities decreases with increasing pressure and temperature; therefore, the difficulty of separating the phases completely in the boiler drum increases accordingly. Since the tendency to carryover is greater at higher operating pressures, it is necessary to maintain lower boiler water concentrations to meet the same steam purity target.