The
acetylene is then ready to enter the service; but a station meter (the
last item in the plant) is useful as giving a means of detecting any leak
in the delivery-pipes and in checking the make of gas from the amount of
carbide consumed. If the gas is required for the supply of a district, a
station meter becomes quite necessary, because the public lamps will be
fed with gas at a contract rate, and without the meter there would be no
control over the volume of acetylene they consume. Where the gas finally
leaves the generating-house, or where it enters the residence, a full-way
stopcock should be put on the main.
GENERATOR RESIDUES.--According to the type of generator employed the
waste product removed therefrom may vary from a dry or moist powder to a
thin cream or milk of lime. Any waste product which is quite liquid in
its consistency must be completely decomposed and free from particles of
calcium carbide of sensible magnitude; in the case of more solid
residues, the less fluid they are the greater is the improbability (or
the less is the evidence) that the carbide has been wholly spent within
the apparatus. Imperfect decomposition of the carbide inside the
generator not only means an obvious loss of economy, but its presence
among the residues makes a careful handling of them essential to avoid
accident owing to a subsequent liberation of acetylene in some
unsuitable, and perhaps closed, situation.
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