Page 303 - Boiler plant and distribution system optimization manual

288 Boiler Plant and Distribution System Optimization Manual

Table 15.6 is the American Boiler Manufac- It shows the need for feedwater to be extreme-
turers Association (AMBA) specified limits for ly pure. With today’s designs, heat-flux rates of
boiler water composition with respect to operat- 250,000 Btu/hr/sq-ft are anticipated. Combined
ing pressure to assure good quality steam. with dimensional restrictions of modem design,
Table 15.7 was developed by the American this has raised the need for the limits in Table
Society of Mechanical Engineers (ASME), Re- 15.7. These new guidelines are only suggested
search Committee on Water in Thermal · Power. limits that will continue to be refined.

Table 15.6—American Boiler Manufacturers Association (ABMA) limits for boiler water composition.

Boiler Water Treatment