. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. be taken to see that the pressure valve is kept in working order, and that it is not set too high for the strength of the boiler. It should also have sufficient capacity to release the steam as fast as it can be produced in the boiler under any condition. The Fusible Plug. As an additional safety device, a fusible plug, containing a core made of some metal with a low melting point, like tin, is placed at th
. Agricultural engineering; a text book for students of secondary schools of agriculture, colleges offering a general course in the subject and the general reader. Agricultural engineering. be taken to see that the pressure valve is kept in working order, and that it is not set too high for the strength of the boiler. It should also have sufficient capacity to release the steam as fast as it can be produced in the boiler under any condition. The Fusible Plug. As an additional safety device, a fusible plug, containing a core made of some metal with a low melting point, like tin, is placed at the highest point of the crown sheet which will be first exposed by low water. When, because of low water, the plate becomes heated, the soft metal core of the plug melts away, causing the steam to blow on the fire and put it out. The Boiler Feeder. In order to re- ceive additional water the boiler must be provided with some sort of feeder. One such device is the crosshead pump, which is attached directly to the crosshead of the engine and can be operated only when the engine is running. The independent pump has a steam cylinder of its own and may be operated by steam from the boiler. This type of pump is practically a small steam engine. Another form of boiler feeder is the injector, which takes steam from the boiler and, by allowing it to expand, converts its energy into kinetic energy. As this steam strikes a supply of cold water within the injector it condenses, but the impact drives the water into the boiler. The Feed Water Heater. Many boilers are provided with feed water heaters which use the exhaust steam from the engine Fig1. 244. A fusible plug, which is placed in the crown sheet as shown at F in Fig. Fig. 245. A standard injector. type. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davidson,
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagricul, bookyear1919
