The Gas Holder
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
p-163
2025-11-11
42
An important application of the transmission of pressure by gases is made in the transmission of the gas itself in the delivery of illuminating gas from the gasometer, or gas holder, to the delivery pipes. Figure 1shows how this is done and gives a cross section of the gas holder, which consists of an inverted bowl of steel, the edge of which dips below the surface of water. Pumps force the gas into the holder from the retorts where it is made. Since the holder is supported by the gas underneath it, the weight of the holder produces the pressure that forces the gas through the service pipes.
The sections of the holder work within one another somewhat like the sections of a telescope. A circular trough is bolted on the outside of the upper section at its lower edge (Fig. 1) and is filled with water. An inverted trough is fastened to the inside of the next section below at its upper edge in such a way that when the upper section is filled with gas and rises, the two sections are coupled together by the lips of the troughs, which form a water seal (Fig. 2).
When the weight of the second section is added to that of the first, the pressure on the gas is increased; a governor is therefore placed in the delivery pipe to equalize the pressure. The weight of the upper section must be great enough to give the required pressure to the gas when the other sections are not in use.
Fig.2.
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