Block 2 - Maintain the Boiler Pressure Vessel Self Assessment Flashcards
What is the primary challenge in the maintenance and repair of water tube boilers?
Gaining sufficient access to the tubes
How should the load be reduced when shutting down a boiler?
Gradually
What can happen if the boiler is drained too quickly?
Baking of deposits on heating surfaces
What should be done if excessive cracking is found in the tube sheet?
Consider tube sheet replacement
What test is used to check for cracks in the tube sheet using a dye?
Liquid Dye Penetrant Test
What is the first step in the Liquid Dye Penetrant Test?
Cleaning the workpiece
What is the “firebox end” of a firetube boiler?
The back end exposed to the hottest combustion gases
Why should vessels not be drained until all pressure is relieved?
To prevent uneven contraction and temperature differentials
Why must fins be welded between each tube on the outermost tube wall?
To create a pressure-tight combustion side
Who must perform any repair work on the pressure vessel?
Certified Welder, Licensed Boiler Contractor
What other test methods are mentioned for detecting cracks?
1) Radiography
2) Ultrasonic Testing
3) Magnetic Particle Examination (MPE)
