Boiler Start-up and Warm-up Quiz

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What must operators do to ensure the safety and long life of boilers?

Rapidly heat the boiler metal

Ignore the warm-up rates prescribed by the boiler manufacturers

Pay attention to the warm-up rates prescribed by the boiler manufacturers (correct)

Avoid paying attention to warm-up rates

According to ASME VI Recommended Rules, what should operators do if abnormal conditions occur during the light-off or warm-up period?

Increase the heating rate of the boiler

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

Keep operating the boiler without shutting down

Continue operating the boiler and ignore the abnormal conditions

What is one of the conditions encountered during warm-up that may seem abnormal but should disappear after the boiler is hot?

Slight smoking (correct)

Rapid heating of the boiler metal

Increased condensation

Complete shutdown of the boiler

What should be done before restarting a boiler if abnormal conditions have occurred during warm-up?

Identify and correct the cause of the trouble Signup and view all the answers

What is advised for operators of power boilers if abnormal conditions occur during startup?

Never restart the boiler before correcting the problem Signup and view all the answers

What does ASME VI Recommended Rules advise operators to do if abnormal conditions occur during light-off or warm-up?

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

What can cause flue gas condensation in a boiler?

Contact with cold heating surfaces Signup and view all the answers

What can happen if a cold boiler is fired at too high a rate?

Thermal shock and refractory damage Signup and view all the answers

How can uneven expansion in a boiler be worsened?

By scale buildup on heating surfaces Signup and view all the answers

What is the result of thermal shock in the metal of a boiler?

Formation of tiny cracks Signup and view all the answers

How can boilers be protected from thermal shock?

Warming up boilers slowly Signup and view all the answers

What does flue gas condensation indicate in a boiler?

Contact with cold heating surfaces Signup and view all the answers

What is the recommended maximum rate of increase in boiler water temperature for larger boilers during warm-up?

55°C per hour Signup and view all the answers

What is a good indication of refractory damage during boiler warm-up?

Black, peeling paint on the metal surface 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 ignited Signup and view all the answers

What warning is given regarding leaving a boiler unattended during its warm-up period?

It may cause thermal shock to the metal and refractory Signup and view all the answers

What is the purpose of continually monitoring the boiler while it is warming up and pressurizing?

To check for signs of poor combustion and hot spots on the metal surface Signup and view all the answers

What should be done after the boiler pressure approaches its normal pressure or temperature set point during warm-up?

Switch the firing rate control to automatic Signup and view all the answers

What should be done if combustion gases are not passing normally through the furnace and flue gas passages during warm-up?

Consult manufacturer specifications Signup and view all the answers

What is important to prevent during the warm-up period of a boiler?

Thermal shock of the metal and refractory Signup and view all the answers