Question

How is boiler scale formed? Discuss the disadvantages of scale formation ​

Answer 1

Answer:

Disadvantages of Scale formation  (1) Wastage of fuel : Scales have a poor thermal conductivity so the rate of heat transfer from boiler to inside water is greatly reduced. ... This causes distortion of boiler tube and also makes the boiler unsafe to bear the pressure of the steam, especially in high-pressure boilers.

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Answer 2

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• Boiler scale is caused by impurities being precipitated out of the water directly on heat transfer surfaces or by suspended matter in water settling out on the metal and becoming hard and adherent.
• Common feed water contaminants that can form boiler deposits include calcium, magnesium, iron, aluminum, and silica.

Disadvantages of Scale formation

• Wastage of fuel : Scales have a poor thermal conductivity so the rate of heat transfer from boiler to inside water is greatly reduced.

• This causes distortion of boiler tube and also makes the boiler unsafe to bear the pressure of the steam, especially in high-pressure boilers.

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