Question 378Steam Plants - Assistant Engineer
70% to passWhat is the cause of 'laning' in a boiler tube bank?
AExcessive slag accumulation on the tubes
BLow fuel oil pressure
CReduced furnace volume
DInsufficient air flow
AI Explanation
The correct answer is A) Excessive slag accumulation on the tubes. Laning in a boiler tube bank is caused by the buildup of slag or deposits on the tubes. This uneven accumulation of slag causes some tubes to be more obstructed than others, leading to an uneven flow of gases through the tube bank. This uneven flow, or "laning", can result in localized hot spots and accelerated tube corrosion or failure. The other options are incorrect because they are not the primary causes of laning. Low fuel oil pressure, reduced furnace volume, and insufficient air flow can all contribute to other boiler operational issues, but they do not directly lead to the laning phenomenon in the tube bank.
Related Questions
Q656:When fitting new carbon ring packing on a turbine rotor shaft, carefully filing ... Q729:If the gland assembly shown in the illustration is located at the forward end of... Q47:Which of the conditions listed could prevent a centrifugal condensate pump from ... Q194:Which of the following is the best reason for opening the air cock when draining... Q352:Oil or scale deposits on boiler tube walls will cause _______________.
Ready to test your knowledge?
Take a Steam Plants - Assistant Engineer Practice ExamOfficial Resources