🔍 Key Concepts

• Forced circulation water-tube boiler flow path – where water/steam mixture goes after flashing • Role of downcomers and drums in a water-tube boiler • Difference between natural circulation (density difference) and forced circulation (pump-driven)

💭 Think About

• Trace the path of the water-steam mixture: after some water flashes to steam, where does the remaining hot water logically need to go to complete the boiler circuit? • Ask yourself which options describe a normal, continuous boiler circulation loop versus separate auxiliary systems (heaters, domestic systems, accumulators). • Consider which components are actually standard parts of an auxiliary water-tube boiler and which sound like separate auxiliary systems not directly in the main circulation loop.

✅ Before You Answer

• Identify which choice involves staying within the boiler circulation circuit (drums, tubes, downcomers) versus leaving it for other ship systems. • Check which answers rely on steam traps, feed heaters, or domestic systems that are usually downstream uses of steam, not part of the boiler’s internal circulation. • Confirm that the correct path should allow the water to be reheated and reused in the generating tubes, not discarded or diverted away from the boiler.