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Questions and Answers
What is the most important part of any treatment program for maintaining correct boiler water chemistry?
Why is it important to know the local water chemistry when selecting water treatment equipment?
What is recommended to ensure proper system chemistry and verify that the water treatment equipment is effective?
Who works with chemical suppliers to develop appropriate control ranges for plant water treatment systems?
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Why is testing the water treatment equipment and chemical effectiveness important in the boiler operation process?
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What determines the required water treatment equipment in a plant?
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What safety gear is recommended when testing boiler water?
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What should be done before taking a water sample for testing?
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What equipment is used to deliver titration reagents to samples?
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When should sampling and testing be done in power plants?
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What does hardness measure in water testing?
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What action is required if a water sample taken from an ion-exchange softener shows hardness?
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What does a low phosphate residual in boiler water, stable chemical feed rate, and unchanged boiler load indicate?
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Why is a pH level of 9.5 to 10.5 desired for most boilers?
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How can the hydroxyl (OH–) alkalinity be determined for boiler water?
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What does an increase in the conductivity of water indicate?
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What is the purpose of a molybdenum test in closed loop heating and cooling water systems?
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Why are alkalinity tests performed on source water?
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What is the main purpose of the boiler water test?
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Which indicator is used in the Phenolphthalein Alkalinity (P-Alkalinity) Test?
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What does a pink color in the Phenolphthalein Alkalinity test indicate?
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What is the main purpose of the Methyl Alkalinity (M-Alkalinity) Test?
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What does a green color in the Methyl Alkalinity test indicate?
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What is the consequence of excessively high total alkalinity in boiler water?
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Why must OH– alkalinity be present in boiler water?
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What is the purpose of maintaining a residual of excess sodium sulfite in the boiler water?
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What is the purpose of adding sodium phosphate directly into the boiler?
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What is the consequence of excessively high phosphate concentration in the boiler water?
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How are excessive pitting and dissolved oxygen in the boiler water addressed?
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What is the purpose of measuring a 50 ml sample of boiler water and adding acid starch indicator in the sulfite residual test procedure?
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Study Notes
Importance of Boiler Water Chemistry
- Maintaining correct boiler water chemistry is crucial in any treatment program
- Local water chemistry knowledge is essential when selecting water treatment equipment
Ensuring Proper System Chemistry
- Verify water treatment equipment effectiveness by testing and monitoring
- Plant operators and chemical suppliers work together to develop control ranges for plant water treatment systems
Water Treatment Equipment and Testing
- Testing water treatment equipment and chemical effectiveness is vital in the boiler operation process
- Required water treatment equipment is determined by the plant's specific needs
- Safety gear, such as gloves and goggles, is recommended when testing boiler water
Water Sampling and Testing
- Before taking a water sample, ensure the area is clean and free from contamination
- Bottle dispensers are used to deliver titration reagents to samples
- Sampling and testing should be done regularly in power plants, ideally during normal operating conditions
Water Testing Parameters
- Hardness measures the concentration of calcium and magnesium ions in water
- If a water sample from an ion-exchange softener shows hardness, regeneration or replacement is required
- Low phosphate residual, stable chemical feed rate, and unchanged boiler load indicate proper chemical treatment
pH Levels and Alkalinity
- A pH level of 9.5 to 10.5 is desired for most boilers to prevent corrosion and scaling
- Hydroxyl (OH–) alkalinity can be determined by measuring the excess sodium hydroxide in boiler water
- An increase in water conductivity indicates increased dissolved solids
Molybdenum and Alkalinity Tests
- Molybdenum tests are used to detect corrosion in closed loop heating and cooling water systems
- Alkalinity tests are performed on source water to determine the amount of acidic compounds
- The main purpose of boiler water testing is to ensure the water is suitable for boiler operation
Phenolphthalein and Methyl Alkalinity Tests
- Phenolphthalein indicator is used in the P-Alkalinity Test to detect the presence of hydroxide alkalinity
- A pink color in the Phenolphthalein test indicates the presence of hydroxide alkalinity
- The main purpose of the M-Alkalinity Test is to detect the presence of bicarbonate alkalinity
- A green color in the Methyl Alkalinity test indicates the presence of bicarbonate alkalinity
Boiler Water Chemistry Consequences
- Excessively high total alkalinity in boiler water can lead to scaling and fouling
- OH– alkalinity is necessary to prevent corrosion and scaling in boiler water
- Excessively high phosphate concentration in boiler water can lead to scaling and fouling
Sodium Sulfite and Sodium Phosphate
- Maintaining a residual of excess sodium sulfite in boiler water helps remove oxygen and prevent corrosion
- Adding sodium phosphate directly into the boiler helps prevent scaling and corrosion
- Excessive pitting and dissolved oxygen in boiler water can be addressed by increasing sodium sulfite and sodium phosphate dosages
Sulfite Residual Test
- The purpose of measuring a 50 ml sample of boiler water and adding acid starch indicator is to determine the sulfite residual in the boiler water
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Description
Test your knowledge of boiler water testing and treatment with this quiz. Learn about the importance of hardness tests, phosphate residual, chemical feed rate, and pH levels in maintaining a safe boiler operation.
