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intro chapter 04 boilers

intro chapter 04 boilers - Chapter 4 Boilers Marine Boilers...

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Chapter 4 - Boilers Marine Boilers - D-Type, Natural Circulation, Water Tube Tubes contain water and steam Combustion Gases outside the tubes Water circulates throughout the boiler without a pump due to different densities of water and steam Fuel is burned in the furnace Water from the steam drum, mud drum, headers, and tubes is heated Gases flow over the tubes containing water and steam at a lower temperature. Thus, heat flows into the water. Water boils in the tubes, steam bubbles rise to the steam drum. Steam is collected in the steam drum and directed to the superheater tubes.
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The Steam Drum Upper reservoir for water Point where steam is separated from the water Typically half full of water Uses a boiler gage glass to ascertain level Boiler water level is critical Without water to remove heat from the boiler, the boiler tubes will melt Lower portion of the steam drum is the tube sheet and is thicker Upper portion is the wrapper sheet. Manholes allow access through the heads. An aircock is placed at the top to vent sir during startup and to eliminate vacuum during shutdown
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The Steam Drum System
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