Even when boiler feedwater constituents meet ASME guidelines and is considered to be of good quality, additional internal treatment of boiler water helps control scale, fouling, corrosion, and carryover. There are additional boiler operational considerations that should be controlled, including:

• Boiler water level must be maintained within predetermined ranges so that the heating surfaces remain submerged and that boiler water doesn’t enter the steam takeoff point
• Concentration of constituents in boiler water must be maintained within prescribed limits
• Manual boiler blowdown practice must follow specific valve sequences
• Extreme firing rate changes, as well as rapidly firing the boiler when cold, or rapidly cooling the boiler when taking it offline are to be avoided