Boiler and Cooling Water (week 1) (act/quiz 1)

______ is the water supplied to a boiler for the purpose of generating steam.

• Boiler feed water

• Cooling water

The quality and properties of boiler feed water are not essential factors in ensuring the reliable and safe operation of the boiler.

• True

• False

Removes excess heat from machinery to prevent overheating and component damage.

• Cooling Water Function

• Boiler Water Function

Provides high-quality steam for propulsion and auxiliary systems

• Cooling Water Function

• Boiler Water Function

In high-pressure boilers, maintaining correct water chemistry is critical because elevated pressures and temperatures increase the risk of scaling, corrosion, and carryover, which can lead to severe damage and reduced efficiency.

• True

• False

Deposits and scale act as insulators, leading to overheating and potential failure of boiler tubes and cooling jackets.

• True

• False

Low levels of dissolved solids in boiler water can lead to steam contamination, affecting turbine efficiency and performance.

• True

• False

Common Impurities: Sources and Effects

Impurity: _______

Source: Air leakage, makeup water

Effect: Corrosion, pitting

• Alkalinity (OH⁻, CO₃²⁻, HCO₃⁻)

• Carbon Dioxide (CO₂)

• Chlorides (Cl⁻)

• Dissolved Oxygen (O₂)

Common Impurities: Sources and Effects

Impurity: Calcium & Magnesium (Hardness)

Source: Natural water sources

Effect:________

 

• Reduces heat transfer efficiency

• Scaling on heat exchanger surfaces

• High alkalinity causes embrittlement

• Acidic water, corrosion

Common Impurities: Sources and Effects

Impurity: Oil and Grease

Source:______

Effect:Reduces heat transfer efficiency

 

• Leaks from machinery

• Decomposition of carbonates

• Air leakage, makeup water

• Water additives, feedwater