For obvious
reasons the vent-pipe of a holder should have a diameter equal to that of
the gas-inlet tube, and the vent-pipe of a generator be equal in size to
the gas-leading tube.
FROTHING IN GENERATORS.--A very annoying trouble which crops up every now
and then during the evolution of acetylene consists in the production of
large masses of froth within the generator. In the ordinary way,
decomposition of carbide is accompanied by a species of effervescence,
but the bubbles should break smartly and leave the surface of the liquid
reasonably free from foam. Sometimes, however, the bubbles do not break,
but a persistent "head" of considerable height is formed. Further
production of gas only increases the thickness of the froth until it
rises so high that it is carried forward through the gas-main into the
next item of the plant. The froth disappears gradually in the pipes, but
leaves in them a deposit of lime which sooner or later causes
obstructions by accumulating at the angles and dips; while during its
presence in the main the steady passage of gas to the holder is
interrupted and the burners may even be made to jump. Manifestly the
defect is chiefly, if not always, to be noticed in the working of
carbide-to-water generators.
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