Clayton Feedwater Treatment Manual

SECTION III Chemical Treatment

3.1 Water Quality Requirements Proper water conditions for any boiler system are vital for maintaining efficient and problem-free operation. The optimum water conditions for treated make-up water, feedwater (boiler water), and con- densate are outlined below. Make-up Water • 0 ppm Hardness: accomplished by softening • <0.5 ppm iron • 0 Suspended solids Feedwater (boiler water) • 0 ppm Hardness (4 ppm maximum) • <5.0 ppm iron • 0 Suspended solids • pH 10.5–11.5, 12.5 maximum • Oxygen free with excess sulfite residual of 50–100 ppm during operation (>100 ppm during wet lay-up) • Maximum TDS of 8500 ppm (preferred range of 3,000–6,000) • Silica <120 ppm with sufficient OH alkalinity Condensate (if returned) • <0.5 ppm iron • pH 8.0-8.5 Typical pre-treatment equipment for a Clayton unit consists of a softener to remove hardness and a feedwater tank to reduce oxygen. If the raw make-up water source is unusually high in total alkalinity, iron, or silica, other pre-treatment systems may be required. The above conditions are maintained by the appropriate pre-treatment equipment and by a well managed water treatment program and daily water quality testing, regardless of operational status. See the section on Clayton's Coil Guard Technology. These conditions must be maintained at all times for an efficient, problem-free operation. Further- more, off-line conditions are just as important and the prescribed lay-up procedures must be maintained and tested daily.

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04/12/2013

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