A water-tube type boiler when compared to a fire-tube type boiler has an advantage of __________. a water-tube boiler requiring less chemical compounding the fire-tube boiler providing a greater amount of heat transfer to the water as the hot gases pass through the tubes
• Water-tube vs fire-tube boiler construction – where is the water and where are the hot gases? • Heat transfer surface area and how tube arrangement affects it • Water treatment / chemical compounding needs for different boiler designs
• Think about which design (water-tube or fire-tube) is normally used for higher pressures and temperatures, and why that might affect water treatment needs. • Consider which design exposes more water surface directly to hot gases and how that impacts heat transfer efficiency. • Ask yourself: Does having water inside tubes versus outside tubes automatically mean you need more or less chemical treatment?
• Be clear on which side of the metal the water is on in each boiler type. • Verify typical operating pressure ranges for water-tube vs fire-tube boilers from your notes or textbook, not by guessing. • Check whether chemical compounding requirements are mainly driven by boiler pressure/temperature and circulation, or by whether it is water-tube or fire-tube in name only.
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