Boiler Low Water Level Fuel Cut-off Equipment

Play an AI-generated podcast conversation about this lesson

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?

To prevent overheating and weakening of pressure-retaining parts Signup and view all the answers

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

Maximum allowable working pressures (MAWP) Signup and view all the answers

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

Level of water in the boiler 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?

Open the burner circuit and energize the alarm circuit 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?

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

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

Interruption of the water supply to the feedwater pump 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?

The control switch closes and the feedwater pump starts Signup and view all the answers

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

It contains no moving parts, reducing mechanical failure Signup and view all the answers

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

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

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

The burner circuit opening Signup and view all the answers

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

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

Boiler Low Water Level Fuel Cut-off Equipment

Podcast Beta

Questions and Answers