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Boiler Warm-up and Start-up Quiz

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Questions and Answers

What should operators do if abnormal conditions occur during the light-off or warm-up period?

Shut down the boiler immediately and close the main and pilot test firing valves (correct)

Report the abnormal conditions to the boiler manufacturer

Wait for the abnormal conditions to disappear before taking any action

Increase the heating rate to overcome the abnormal conditions

What should operators do before restarting the boiler if abnormal conditions are encountered?

Identify and correct the cause of the trouble (correct)

Increase the fuel supply to overcome the abnormal conditions

Consult with other boiler operators

Ignore the abnormal conditions and continue with the warm-up process

What may operators notice from the stack when a cold oil-fired boiler is started?

No visible exhaust

Slight smoking (correct)

Unusual odor

Excessive steam

Why is it important for operators to pay attention to boiler warm-up rates?

To prevent leaks and premature boiler failure Signup and view all the answers

What does ASME VI Recommended Rules advise if abnormal conditions occur during boiler warm-up?

Shut down the boiler immediately and close the main and pilot test firing valves Signup and view all the answers

What is the main cause of incomplete combustion in a furnace?

Low atomizing air pressure Signup and view all the answers

In which type of boiler does condensation occur more frequently?

Firetube boilers Signup and view all the answers

What is the result of firing cold boilers at too high a rate?

Uneven expansion Signup and view all the answers

What is the best way to protect a boiler from the damaging effects of thermal shock and uneven expansion?

Warm up the boiler slowly Signup and view all the answers

What factor affects the rate at which a boiler can be brought up to its normal operating temperature?

Boiler water content Signup and view all the answers

What should be the maximum rate of increase in boiler water temperature for larger boilers?

55°C per hour Signup and view all the answers

What is the expected drum pressure after 2 hours of firing for a boiler with relatively hot water on initial firing (79°C)?

1175 kPa Signup and view all the answers

When should the water level control system for steam boilers be placed on automatic?

As soon as the boiler is started Signup and view all the answers

What should be monitored while the boiler is warming up and pressurizing?

The flame pattern and signs of poor combustion Signup and view all the answers

When should the firing rate control be switched to automatic after the boiler pressure approaches its normal set point?

After the warm-up period Signup and view all the answers