Boiler Water Treatment Quiz

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Questions and Answers

Which element has a high concentration in boiler water?

  • Hydrogen
  • Oxygen (correct)
  • Soda
  • Salt

To minimize water corrosion, boiler water must be kept in what condition?

  • Alkaline (correct)
  • Slightly Acidic
  • Neutral
  • Pure Freshwater

Why is phosphate used in the chemical treatment of boiler water?

  • To neutralize the harmful effects of hydrogen embrittlement
  • To decrease dissolved oxygen content
  • To control alkalinity and neutralize vanadium
  • To convert scale-forming to relatively harmless sludges (correct)

What can cause foaming and moisture carryover in a boiler?

<p>Excessive number of dissolved solids in the boiler water (C)</p> Signup and view all the answers

What condition increases the hardness of boiler water?

<p>Excessive number of dissolved solids in the boiler water (B)</p> Signup and view all the answers

What procedure should be done to remove hardness from boiler water?

<p>Use various phosphoric acid-based chemicals in the blow-down process of boiler (A)</p> Signup and view all the answers

As the pH of the boiler water becomes zero, what happens to the water?

<p>It becomes increasingly acidic (A)</p> Signup and view all the answers

What property is measured by testing the boiler water for chloride content?

<p>Total hardness of the water (B)</p> Signup and view all the answers

What is the effect of dissolved salts from sea contamination in boiler water?

<p>Causes corrosion in boiler tubes (B)</p> Signup and view all the answers

What type of fuel oil contaminant can cause heavy slagging and high temperature corrosion of boiler tubes?

<p>Vanadium Salts (B)</p> Signup and view all the answers

What is the purpose of an economizer in a marine boiler?

<p>To heat boiler feed water using waste gas (D)</p> Signup and view all the answers

What can cause a feed pump of an auxiliary boiler to lose suction?

<p>Pump recirculating line being open too much (A)</p> Signup and view all the answers

What is the effect of boiler surface blowdown?

<p>It removes most precipitated solids (A)</p> Signup and view all the answers

Why is dissolved carbon dioxide gas in boiler water dangerous?

<p>It forms carbonic acid which attacks watersides (B)</p> Signup and view all the answers

What element should be considered for water in a steaming auxiliary boiler to be tested daily?

<p>Dissolved Oxygen (A)</p> Signup and view all the answers

What does a boiler water pH reading equal to 7 indicate?

<p>Neutral (A)</p> Signup and view all the answers

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Study Notes

Boiler Water Chemistry

  • Soda (sodium carbonate) has a high concentration in boiler water.
  • To minimize water corrosion, boiler water must be kept in an alkaline condition.

Phosphate Treatment

  • Phosphate is used to control alkalinity and neutralize vanadium.
  • Phosphate also converts scale-forming to relatively harmless sludges.

Water Hardness and Foaming

  • Excessive dissolved solids in the boiler water can cause foaming and moisture carry over.
  • Hardness of boiler water increases with excessive dissolved solids.
  • Standard hardness value is kept less than 1 Mg of CaCo3 per liter.

pH Levels and Hardness

  • A pH of zero indicates increasingly acidic water.
  • Hardness of boiler water can be removed by blowing down boiler water to 50% capacity and replenishing with low acidic water.

Chloride Content and Contamination

  • Testing boiler water for chloride content measures dissolved salts from sea contamination.
  • Chloride content can indicate contamination from sea water.

Heat Conduction and Boiler Materials

  • Water is the best conductor of heat in a marine boiler.
  • Heavy slagging and high temperature corrosion of boiler tubes can result from using a fuel oil with high amounts of vanadium salts.

Heat Exchangers and Boiler Systems

  • An economizer is a type of heat exchanger used to heat boiler feed water by means of waste gas.
  • Surface blow down can remove most precipitated solids from boiler water.

Feed Pumps and Boiler Operations

  • Decreased feed water temperature can cause the feed pump of an auxiliary boiler to lose suction.
  • Performing boiler surface blow down can disrupt circulation in a steaming boiler.

Carbon Dioxide and Boiler Safety

  • Carbon dioxide gas dissolved in boiler water is dangerous because it forms carbonic acid which attacks watersides.

Daily Water Testing

  • Dissolved Oxygen should be considered for water in a steaming auxiliary boiler to be tested daily.

Conductivity and Corrective Actions

  • A low conductivity reading in boiler water test results requires adding boiler compound or disodium phosphate.
  • A pH reading of 7 indicates neutral water.

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