The gas must be fairly well dried before it enters the
filter, otherwise the latter will become choked with deposited moisture,
and obstruct the passage of the gas.
Having now described the various items which go to form a well-designed
acetylene installation, it may be useful to recapitulate briefly, with
the object of showing the order in which they should be placed. From the
generator the gas passes into a condenser to cool it and to remove any
tarry products and large quantities of water. Next it enters a washing
apparatus filled with water to extract water-soluble impurities. If the
generator is of the carbide-to-water pattern, the condenser may be
omitted, and the washer is only required to retain any lime froth and to
act as a water-seal or non-return valve. If the generator does not wash
the gas, the washer must be large enough to act efficiently as such, and
between it and the condenser should be put a mechanical filter to extract
any dust. From the washer the acetylene travels to the holder. From the
holder it passes through one or two purifiers, and from there travels to
the drier and filter. If the holder does not throw a constant pressure,
or if the purifier and drier are liable to cause irregularities, a
governor or pressure regulator must be added after the drier.
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