Question 198Steam Plants - 1st Asst/Chief70% to pass
Cratering and water tracking in boiler tubes is caused by _______________.
AI Explanation
The correct answer is A) water trapped between tubes and refractory.
Cratering and water tracking in boiler tubes is caused by water trapped between the boiler tubes and the refractory (the heat-resistant lining of the boiler). This trapped water causes localized corrosion and erosion of the tube metal, leading to the formation of craters and water tracks on the tube surface.
The other answer choices are incorrect because: B) burning a fuel with a high vanadium content can cause different types of fouling and corrosion, but not specifically cratering and water tracking; C) soot corrosion is a different type of corrosion mechanism; and D) baked-on slag deposits can also cause different types of issues, but not the specific problem of cratering and water tracking.
Related Questions
#196 The formation of a pit in the surface of a boiler tube is most likely to occur when _______________.#197 Fireside burning of boiler tubes is usually the direct result of _______________.#199 When the rate of heat transfer through tube walls is so reduced that the metal becomes overheated, which of the following conditions will result in the boiler? #200 Which of the following represents a significant system limitation to be aware of when a burner management system is operated in the 'HAND' mode? #201 In an automatically fired boiler, the steam pressure regulator controls the supply of fuel oil to the burners by responding to variations in the _______________.