Questions and Answers
What corrective action is required when the boiler water test result shows low conductivity?
No action shall be done
What does a boiler water pH reading equal to 7 indicate?
Neutral
What is the term for particles of water leaving the boiler together with the steam?
Carry-Over
What is the boiler water property that the phenolphthalein indicator is used to test?
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What should be done to reduce the amount of oxygen content in the boiler water?
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What is an important factor to consider for efficient operation of a boiler?
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What is the result of excess impurity in boiler feedwater?
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What is the recommended time period to conduct water tests upon taking a water sample?
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What is measured by testing the boiler water for chloride content?
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Which of the following can cause heavy slagging and high temperature corrosion of the boiler tubes?
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What type of heat exchanger is used to heat the boiler feed water by means of waste gas?
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What is the consequence of excessive feed water temperature on the feed pump of an auxiliary boiler?
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What is the purpose of performing boiler surface blow down?
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Why is carbon dioxide gas dissolved in boiler water dangerous?
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Which element should be considered for water in a steaming auxiliary boiler to be tested daily?
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What is the best conductor of heat in a marine boiler?
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What is the primary purpose of phosphate in boiler water treatment?
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What condition must boiler water be kept in to minimize corrosion?
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Which of the following can cause foaming and moisture carryover in a boiler?
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What is the standard hardness value for boiler water?
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What is the primary reason for blowdown in boiler water treatment?
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What is the effect of excessive dissolved solids in boiler water?
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What is the consequence of having a pH of zero in boiler water?
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What is the purpose of using phosphoric acid-based chemicals in boiler water treatment?
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Study Notes
Boiler Water Treatment
- Low conductivity in boiler water test results require no action to be taken.
- A boiler water pH reading of 7 indicates neutral water.
- Carry-over refers to particles of water leaving the boiler with the steam.
- Phenolphthalein indicator is used to test boiler water alkalinity.
- Adding hydrazine reduces oxygen content in boiler water.
- Proper boiler water conditioning is essential for efficient boiler operation.
- Water inside a boiler is used to generate steam.
Boiler Feed Water and Cooling Systems
- High impurity levels in boiler feed water can cause scale and sludge formation, corrosion, priming, and foaming.
- It is not possible to take a sample of engine cooling water from fuel oil valves.
- Water tests should be conducted within 30 minutes of taking a sample.
Chemical Handling and Safety
- When handling chemicals, it is advisable to consult the MSDS (Material Safety Data Sheet).
- Carbon dioxide dissolved in boiler water forms carbonic acid, which attacks watersides.
Boiler Maintenance and Operation
- Surface blow down removes floating impurities from boiler water.
- Excessive feed water temperature can cause the feed pump of an auxiliary boiler to lose suction.
- Economizers are used to heat boiler feed water using waste gas.
- Using a fuel oil with high sodium chloride salts content can cause heavy slagging and high-temperature corrosion of boiler tubes.
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