Internal Treatment

Modern Steam Boilers have a high heat transfer rate: impurities in the feedwater can cause scale or chemical deposits to form and reduce the rate of heat transfer from the tube walls to the water, overheating the metal surfaces whilst reducing the steam output.

The maximum steam output and fuel efficiency of a boiler at any given pressure is governed by the rate at which heat can be supplied and transferred in the boiler.

Chemical deposits or scale inhibit or restrict heat transfer, boiler efficiency falls and the possibility of failure increases.

Boiler feedwater is treated to prevent scale forming on the heat transfer surfaces and to prevent water side corrosion. The treatment should be monitored and adjusted relative to the actual steam evaporation rate throughout the course of the day.

pH maintenance of the feed, boiler and condensate system is essential for corrosion control.

The boiler’s operational pH depends on the boiler pressure, system metals, feed water quality and type of chemical treatment in use and is generally dictated by the water’s p-Alkalinity.