05/05/2018 · * According to EN 12953-10, an oxygen concentration of < 0.05 mg/L is allowed in the boiler feed water of shell boilers with an operating pressure ≤
As a rule of thumb, about 1000 ppm can be considered a safe maximum. A hard water containing 200 ppm in the feedwater would tolerate five concentrations in the boiler (200 times 5 = 1000). On the other hand, a soft water with 25 ppm could be concentrated 40 times before reaching the critical point (40 times 25 = 1000).
Hardness - Hard water does not foam. However, boiler water is deliberately softened to prevent scale formation, and this gives it a propensity to foam. Colloidal substances - Contamination of boiler water with a colloid in suspension, for example. milk, causes violent foaming. Note: Colloidal particles are less than 0.000 1 mm in diameter, and
16/07/2009 · The main purpose of controlling hardness is to prevent scale formation building on the interior surface.This can be done by keeping hardness values low. Standard hardness value is kept less than 1 Mg of CaCo3/liter.Hardness can be removed by using various phosphoric acid based chemicals in the blow-down process of boiler.