4BE3.5 U4 C5 Obj 3 EMH
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EASY What is the recommended pH level for the water in the boiler during the layup period?

  • 11
  • 8
  • 9
  • 10 (correct)

    • What is the purpose of adding sodium sulfite to the water in the boiler?

  • To increase the pH level
  • To provide a sufficient quantity of oxygen scavenger residual (correct)
  • To reduce the pressure in the boiler
  • To remove impurities from the water

    • What is the recommended pressure to maintain on the boiler during the layup period?

  • 40 kPa (correct)
  • 30 kPa
  • 50 kPa
  • 20 kPa

    • What is the purpose of filling the boiler until it overflows from the vents?

    <p>To remove air from the boiler</p> Signup and view all the answers

    What is the final step in preparing the boiler for layup?

    <p>Maintain approximately 40 kPa of pressure on the boiler</p> Signup and view all the answers

    What is the most common method used for long-term shutdown of steam boilers?

    <p>Dry layup</p> Signup and view all the answers

    Why is a dry layup preferred in freezing conditions?

    <p>To prevent freezing of water inside the boiler</p> Signup and view all the answers

    What is the purpose of using air movers in a dry layup?

    <p>To force air through the boiler and out the steam drum</p> Signup and view all the answers

    How often should desiccant trays be checked in a dry layup?

    <p>Bi-weekly to monthly</p> Signup and view all the answers

    What is the recommended quantity of quicklime for every 2.83 m3 of boiler volume?

    <p>3.2 kg</p> Signup and view all the answers

    What is the purpose of adjusting boiler chemistry in a wet layup?

    <p>To account for long-term chemical needs</p> Signup and view all the answers

    Why is it advisable to drain the boiler and clean its fireside and waterside prior to a wet layup?

    <p>To ensure the chemicals are thoroughly circulated</p> Signup and view all the answers

    Which type of layup is common for shorter duration shutdowns?

    <p>Wet layup</p> Signup and view all the answers

    MEDIUM What is the primary purpose of consulting a certified water treatment professional during the wet layup preparation?

    <p>To identify the necessary chemicals and their concentrations for the boiler water</p> Signup and view all the answers

    What is the primary function of the sodium sulfite in the boiler water during the layup period?

    <p>To provide a sufficient quantity of oxygen scavenger residual</p> Signup and view all the answers

    Why is it necessary to maintain 40 kPa of pressure on the boiler during the layup period?

    <p>To prevent corrosion of the boiler components</p> Signup and view all the answers

    What is the purpose of filling the boiler until it overflows from the vents?

    <p>To remove any air pockets from the boiler</p> Signup and view all the answers

    What is the purpose of shutting down the boiler before filling it with water?

    <p>To ensure the boiler is safe for the layup period</p> Signup and view all the answers

    What determines the method of layup to be used on a steam boiler?

    <p>The expected duration and purpose of the layup</p> Signup and view all the answers

    What is the primary purpose of using desiccant in a dry layup?

    <p>To absorb moisture</p> Signup and view all the answers

    When is a wet layup typically used for a steam boiler?

    <p>For short-term shutdowns</p> Signup and view all the answers

    What is the purpose of closing and making leak-tight all openings to and from the boiler in a dry layup?

    <p>To prevent moisture from entering the boiler</p> Signup and view all the answers

    Why is it important to dry the boiler thoroughly in a dry layup?

    <p>To prevent corrosion</p> Signup and view all the answers

    What is the purpose of adjusting boiler chemistry in a wet layup?

    <p>To account for long-term chemical needs</p> Signup and view all the answers

    What is the recommended frequency for checking desiccant trays in a dry layup?

    <p>Bi-weekly to monthly</p> Signup and view all the answers

    Why is it important to drain and clean the boiler prior to a wet layup?

    <p>To remove any debris or sediment</p> Signup and view all the answers

    HARD What is the primary reason for using a dry layup instead of a wet layup in freezing conditions?

    <p>To prevent freezing of water in the boiler</p> Signup and view all the answers

    What is the purpose of using air movers in a dry layup?

    <p>To force air through the boiler and out the steam drum</p> Signup and view all the answers

    What is the purpose of placing trays of moisture-absorbing materials inside the boiler shell or drums?

    <p>To catch the removed moisture and maintain a dry environment</p> Signup and view all the answers

    Why is it necessary to close and make leak-tight all openings to and from the boiler in a dry layup?

    <p>To prevent moisture from entering the boiler</p> Signup and view all the answers

    What is the primary function of the desiccant in a dry layup?

    <p>To absorb moisture from the air</p> Signup and view all the answers

    What determines the frequency of checking desiccant trays in a dry layup?

    <p>Bi-weekly to monthly basis</p> Signup and view all the answers

    What is the primary purpose of adjusting boiler chemistry in a wet layup?

    <p>To account for long-term chemical needs</p> Signup and view all the answers

    Why is it advisable to drain the boiler and clean its fireside and waterside prior to a wet layup?

    <p>To ensure the boiler is clean and free of debris</p> Signup and view all the answers

    What is the primary reason for adjusting the pH of the water to 10 during the wet layup procedure?

    <p>To reduce the risk of corrosion within the boiler</p> Signup and view all the answers

    What is the primary role of the head tank, nitrogen blanket, or steam blanket in the wet layup procedure?

    <p>To maintain a constant pressure on the boiler</p> Signup and view all the answers

    Why is it necessary to fill the boiler until it overflows from the vents during the wet layup procedure?

    <p>To ensure the removal of air from the boiler</p> Signup and view all the answers

    What is the primary benefit of consulting a certified water treatment professional during the wet layup procedure?

    <p>To develop a customized chemistry regimen for the boiler water</p> Signup and view all the answers

    What is the primary purpose of depressurizing the boiler before filling it with water during the wet layup procedure?

    <p>To prevent the formation of steam pockets in the boiler</p> Signup and view all the answers

    Study Notes

    Proper Storage of Out-of-Service Steam Boilers

    • Proper storage is critical for maintaining the longevity of a steam boiler
    • Improper layup can shorten a boiler's lifespan

    Dry Layup Method

    • Used for long-term shutdown, boilers not on standby, shutdown in freezing conditions, and when internal inspection or boiler entry is required
    • Steps:
      • Shut down the boiler
      • Lock out, drain, and clean the boiler
      • Dry the boiler thoroughly using air movers
      • Place trays of moisture-absorbing materials (quicklime, silica gel, or activated alumina) inside the shell or drums
      • Quantities:
        • 3.2 kg of quicklime for every 2.83 m3 of boiler volume
        • 3.6 kg of silica gel for every 2.83 m3 of boiler volume
      • Close and seal handholes, manholes, inspection ports, and all openings
      • Check desiccant trays bi-weekly to monthly to assess replacement needs

    Wet Layup Method

    • Used for shorter duration shutdowns, boilers on standby, and shutdowns when freezing conditions cannot occur
    • Steps:
      • Adjust boiler chemistry for long-term chemical needs
      • Add chemicals while the boiler is operating to ensure circulation
      • Drain and clean the boiler (optional but advisable)
      • Procedure for direct wet layup:
        • Perform water tests as per plant procedures
        • Adjust pH to 10 using recommended alkali
        • Adjust sodium sulfite to 200 ppm for sufficient oxygen scavenger residual
        • Adjust all other chemical parameters to recommended regimen
        • Shut down and depressurize the boiler
        • Fill the boiler until it overflows, then close vents
        • Maintain 40 kPa pressure during the layup period

    Proper Storage of Out-of-Service Steam Boilers

    • Proper storage is critical for maintaining the longevity of a steam boiler
    • Improper layup can shorten a boiler's lifespan

    Dry Layup Method

    • Used for long-term shutdown, boilers not on standby, shutdown in freezing conditions, and when internal inspection or boiler entry is required
    • Steps:
      • Shut down the boiler
      • Lock out, drain, and clean the boiler
      • Dry the boiler thoroughly using air movers
      • Place trays of moisture-absorbing materials (quicklime, silica gel, or activated alumina) inside the shell or drums
      • Quantities:
        • 3.2 kg of quicklime for every 2.83 m3 of boiler volume
        • 3.6 kg of silica gel for every 2.83 m3 of boiler volume
      • Close and seal handholes, manholes, inspection ports, and all openings
      • Check desiccant trays bi-weekly to monthly to assess replacement needs

    Wet Layup Method

    • Used for shorter duration shutdowns, boilers on standby, and shutdowns when freezing conditions cannot occur
    • Steps:
      • Adjust boiler chemistry for long-term chemical needs
      • Add chemicals while the boiler is operating to ensure circulation
      • Drain and clean the boiler (optional but advisable)
      • Procedure for direct wet layup:
        • Perform water tests as per plant procedures
        • Adjust pH to 10 using recommended alkali
        • Adjust sodium sulfite to 200 ppm for sufficient oxygen scavenger residual
        • Adjust all other chemical parameters to recommended regimen
        • Shut down and depressurize the boiler
        • Fill the boiler until it overflows, then close vents
        • Maintain 40 kPa pressure during the layup period

    Proper Storage of Out-of-Service Steam Boilers

    • Proper storage is critical for maintaining the longevity of a steam boiler
    • Improper layup can shorten a boiler's lifespan

    Dry Layup Method

    • Used for long-term shutdown, boilers not on standby, shutdown in freezing conditions, and when internal inspection or boiler entry is required
    • Steps:
      • Shut down the boiler
      • Lock out, drain, and clean the boiler
      • Dry the boiler thoroughly using air movers
      • Place trays of moisture-absorbing materials (quicklime, silica gel, or activated alumina) inside the shell or drums
      • Quantities:
        • 3.2 kg of quicklime for every 2.83 m3 of boiler volume
        • 3.6 kg of silica gel for every 2.83 m3 of boiler volume
      • Close and seal handholes, manholes, inspection ports, and all openings
      • Check desiccant trays bi-weekly to monthly to assess replacement needs

    Wet Layup Method

    • Used for shorter duration shutdowns, boilers on standby, and shutdowns when freezing conditions cannot occur
    • Steps:
      • Adjust boiler chemistry for long-term chemical needs
      • Add chemicals while the boiler is operating to ensure circulation
      • Drain and clean the boiler (optional but advisable)
      • Procedure for direct wet layup:
        • Perform water tests as per plant procedures
        • Adjust pH to 10 using recommended alkali
        • Adjust sodium sulfite to 200 ppm for sufficient oxygen scavenger residual
        • Adjust all other chemical parameters to recommended regimen
        • Shut down and depressurize the boiler
        • Fill the boiler until it overflows, then close vents
        • Maintain 40 kPa pressure during the layup period

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    Description

    Learn about the importance of proper storage for steam boilers and the steps involved in the dry layup method for long-term shutdown.

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