Question

Hard water is unfit for use in boilers for steam generation because__________ *​

Answer 1

Answer:

it causes both inefficient fuel consumption and a danger of the boiler bursting. The calcium bicarbonate present in hard water decomposes to form insoluble calcium carbonate.

Hard water has minerals which will coat the inside of boiler tubes for water tube boilers and the outside of tubes for fire tube boilers. Either way, when this occurs, the heat of the fire cannot transfer easily through the tubes to the water because the attached minerals is a very good insulator. This means the metal boiler tubes get hotter than designed and can begin to sag. Ultimately the tubes can overheat, and pinhole leaks can begin to occur, or a major overheating event of sagging tubes.

This then requires retubing of the boiler and is a major loss.

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Answer 2

Hard water is unfit for use in boilers for a steam generation because:

• Hard water contains a salt of calcium and magnesium that do not form scum with soap.
• Hard water is different from soft water as soft water from leather with soap and is not harmful to the body.
• Magnesium and calcium salts are present in hard water and are deposited in pipes during steam generation because these salts do not evaporate and get accumulated. this is responsible for tube failure due to overheating of its material.