Boiler Low Water Level Fuel Cut-off Equipment
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Questions and Answers

What is the purpose of the low water fuel cut-off (LWCO) in a boiler?

  • To regulate the fuel flow into the boiler
  • To detect the level of water in the boiler and shut off the burner if the water level drops to an unsafe level (correct)
  • To increase the pressure in the boiler
  • To cool down the boiler system

    • Which type of boilers do not require low water fuel cut-offs?

  • Electrode-type electric boilers (correct)
  • High-pressure boilers
  • Gas-fired boilers
  • Boilers with fin tube design

    • What is the lowest permissible water level (LPWL) for a boiler?

  • The minimum water level allowed in the boiler
  • The maximum water level allowed in the boiler
  • The lowest water level at which a boiler can be safely operated (correct)
  • A level determined by the fuel type used in the boiler

    • Why are low water fuel cut-offs considered an important safety control for boilers?

    <p>To prevent overheating and weakening of pressure-retaining parts</p> Signup and view all the answers

    What is essential to consider when repairing or replacing LWCOs in a boiler?

    <p>Maximum allowable working pressures (MAWP)</p> Signup and view all the answers

    What does a low water fuel cut-off (LWCO) directly detect in a boiler?

    <p>Level of water in the boiler</p> Signup and view all the answers

    What is the function of the low water fuel cut-off when the water level drops to level C?

    <p>Open the burner circuit and energize the alarm circuit</p> Signup and view all the answers

    What happens to the low water fuel cut-off when the water level drops below the upper probe in the electric probe type cut-off?

    <p>The switch opens, interrupting the power supply to the fuel valve</p> Signup and view all the answers

    What is a possible cause of rapidly falling water level in the boiler?

    <p>Interruption of the water supply to the feedwater pump</p> Signup and view all the answers

    How does the low water fuel cut-off respond when the water level drops to level B during normal operation?

    <p>The control switch closes and the feedwater pump starts</p> Signup and view all the answers

    What is the advantage of the electric probe type low water fuel cut-off?

    <p>It contains no moving parts, reducing mechanical failure</p> Signup and view all the answers

    What does Figure 7 show in relation to low water fuel cut-off?

    <p>Operation of a low water fuel cutoff actuated by a float and magnet</p> Signup and view all the answers

    What triggers the alarm circuit in a low water fuel cut-off device?

    <p>The burner circuit opening</p> Signup and view all the answers

    In what scenario will manual reset of a low water fuel cut-off possibly be required?

    <p>When the switch fails to shut down the boiler at low water level</p> Signup and view all the answers

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