Question 212Steam Plants - 1st Asst/Chief70% to pass
In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because _______________.
AI Explanation
The correct answer is A) they require more water flow since they are exposed to the greatest heat.
In most marine boilers, the first few rows of generating tubes, called the screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes. This is because these tubes are directly exposed to the highest heat from the burners, and they need to carry a greater volume of water to prevent overheating and potential tube failure. The larger diameter allows for increased water flow to absorb the intense radiant heat, which is critical for the overall efficiency and safety of the boiler system.
The other answer choices are incorrect because they do not accurately describe the primary reason for the larger diameter of the screen or furnace row tubes. Options B, C, and D describe secondary functions or features of these tubes, but do not address the key reason for their larger size.
Related Questions
#210 In the boiler shown in the illustration, the arrow "E" indicates a ________________. Illustration SG-0008#211 One advantage of installing water wall tubes in a boiler furnace is to _______________.#213 Which area shown in the illustration will offer the most resistance to heat transfer from the fireside to the waterside of a boiler tube? Illustration SG-0017 #214 Under what operating conditions may water wall header drains be used for blow down? #215 If a ship is to be laid up for an indefinite period, the steam side of the main condenser should be _______________.