Consensus on Operating Practices for the Control of Feedwater and Boiler Water Chemistry in Industrial and Institutional Boilers
Section 3. Objectives of Water Treatment
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The absence of adequate external and internal treatment can lead to operational upsets or unscheduled outages and is ill-advised from the point of view of safety, economy, and reliability. Where a choice is available, the reduction or removal of objectionable constituents by pretreatment external to the boiler is always preferable to, and more reliable than, management of these constituents within the boiler by internal chemical treatment, which involves boiler blowdown and chemical feed to the boiler system.