2. Give reasons for the following:(a) Hard water is not suitable for the bolier
Answers
Answer:
Hard water contains dissolved salts of calcium and magnesium. It gives poor lather with soap and hence is not intended to be used in laundries and in water boilers used in industries. It forms scales (also called lime scales) on the walls of the boilers and hence to be softened before its usage in industries.
Answer:
Hard water is water that contains a high concentration of minerals, usually calcium and magnesium. These minerals do not volatilize with the steam and continue to build up in the boiler, precipitating out on the watersides as scale. Scale is an effective insulator, requiring more energy to heat the water through. More energy equals more heat, which can lead to blisters, sags and bags in boiler tubes, which will eventually rupture, possibly catastrophically.
When a boiler tube ruptures, the pressure in the boiler is lost and a large volume of water that was inside the boiler and under pressure is suddenly at atmospheric pressure and well above the boiling point. That water flashes into steam, expanding 1600 times the volume it took up as water, with explosive force.
Using hard water in a boiler can lead to boiler explosions.