Questions and Answers
Which element has a high concentration in boiler water?
Oxygen
To minimize water corrosion, boiler water must be kept in what condition?
Alkaline
Why is phosphate used in the chemical treatment of boiler water?
To convert scale-forming to relatively harmless sludges
What can cause foaming and moisture carryover in a boiler?
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What condition increases the hardness of boiler water?
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What procedure should be done to remove hardness from boiler water?
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As the pH of the boiler water becomes zero, what happens to the water?
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What property is measured by testing the boiler water for chloride content?
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What is the effect of dissolved salts from sea contamination in boiler water?
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What type of fuel oil contaminant can cause heavy slagging and high temperature corrosion of boiler tubes?
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What is the purpose of an economizer in a marine boiler?
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What can cause a feed pump of an auxiliary boiler to lose suction?
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What is the effect of boiler surface blowdown?
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Why is dissolved carbon dioxide gas in boiler water dangerous?
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What element should be considered for water in a steaming auxiliary boiler to be tested daily?
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What does a boiler water pH reading equal to 7 indicate?
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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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