Water condensing in this section of
the service-pipe will then run down and collect in this drainage-pipe,
from which it can be withdrawn at intervals by opening the plug or tap
for a moment. The condensed water is thus removed from the service-pipe,
and does not obstruct its through-way. Similar drainage devices may be
used at the lowest points of all dips in mains, though there are special
seal-pots which take the place of the cock or plug used to seal the end
of the drainage-pipe. Such seal-pots or "syphons" are commonly used on
ordinary gas-distributing systems, and might be applied in the case of
large acetylene installations, as they offer facilities for removing the
condensed water from time to time in a convenient and expeditious manner.
EXPULSION OF AIR FROM MAINS.--After a service-pipe system has been proved
to be sound, it is necessary to expel the air from it before acetylene
can be admitted to it with a view to consumption. Unless the system is a
very large one, the expulsion of air is most conveniently effected by
forcing from the gasholder preliminary batches of acetylene through the
pipes, while lights are kept away from the vicinity.
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