All the World's Battleships - 1906 to the Present by I. Sturton

By I. Sturton

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The fuel oil burners are grouped in the front wall of the furnace. Combustion air flows through ducting arranged in the double casing to pass through the air registers into the furnace where combustion takes place. Internal access to the boiler is obtained by manholes in the steam and water drums, and by handhole doors in the headers. The drums are of all-welded construction; the water wall headers are solid forged, with welded ends. All the tubes are solid drawn. 38 WATER TUBE BOILERS Q. Sketch and describe an ESD.

A . In early water tube boilers the drums were riveted or forged from a single ingot, but for modern boilers they are invariably of welded construction. The materials and construction procedures are governed by very strict rules laid down by the D O T and the classification societies so that the completed drums can properly withstand the forces set up by internal pressure and thermal effects. Auxiliary steam ' outlet Gauge glass connections Saturated steam outlet Balance connection Safety valve Wrapper plate connection / Air vent / Pressure gauge \\_ jM_ _ , // i i \i\_ /_, connection connect End plate ' ι 1 1 I ' \ - Manhole f Tube plate Auxiliary feed Nozzle Fig 29.

In the majority of cases boiler tubes are expanded, and then bell-mouthed into drums or headers. For large diameter tubes, such as downcomers, grooved seats are used to assist the expansion in forming a tight seal. Where high temperatures are involved, as with superheater tubes, welding may be used in place of expanding. There are three main methods of arranging boiler tubes: Straight tubes are easy to clean and replace but can only be used in conjunction with headers as, if used with drums, the tubes will not enter perpendicular to the tube plate, and the holes would have to be recessed, or arbored, in order to keep the bell-mouthing near the drum surface.

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