Clayton Feedwater Treatment Manual

words, the feedwater in the feedwater tank will have the same composition as the coil water. Thus, the Clayton feedwater consists of treated make-up water, process condensate, and trap fluid; therefore, the feedwater tank water is, in fact, boiler water.

Fig. 2-1 Water flow diagram of a typical steam generating system

2.4 Optimum Water Conditions The following water conditions must be maintained in the feedwater (boiler water) at all times . • Hardness: 0 ppm (4 ppm maximum) • pH 10.5–11.5 (normal range), maximum of 12.5 • Oxygen free with an excess sulfite residual of 50–100 ppm during operation (>100 ppm during wet lay-up) • Maximum TDS of 8,550 ppm (normal range 3,000–6,000 ppm) • Maximum dissolved iron of 5 ppm • Free of suspended solids • Maximum silica of 120 ppm with the proper OH alkalinity 2.5 Unit Operations 2.5.1 Softener A typical Clayton steam generator / fluid heater system starts with the water softener system. Soft water must be used at all times. The water softener regeneration frequency is a function of water hard- ness, rate of water consumption, and softener size. See Sizing A Water Softener in Appendix B for sizing a water softener.

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04/12/2013

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