Thus if the torches were to use sixty cubic
feet of gas per hour, five hours would call for three hundred cubic feet
and a three hundred pound generator should be installed. Generators are
rated according to their carbide capacity in pounds.
_Charging._--The carbide capacity of the generator should be great
enough to furnish a continuous supply of gas for the maximum operating
time, basing the quantity of gas generated on four and one-half cubic feet
from each pound of lump carbide and on four cubic feet from each pound of
quarter, intermediate sizes being in proportion.
Generators are built in such a way that it is impossible for the acetylene
to escape from the gas holding compartment during the recharging process.
This is accomplished (1) by connecting the water inlet pipe opening with a
shut off valve in such a way that the inlet cannot be uncovered or opened
without first closing the shut off valve with the same movement of the
operator; (2) by incorporating an automatic or hydraulic one-way valve so
that this valve closes and acts as a check when the gas attempts to flow
from the holder back to the generating chamber, or by any other means that
will positively accomplish this result.
In generators having no separate gas holding chamber but carrying the
supply in the same compartment in which it is generated, the gas contained
under pressure is allowed to escape through vent pipes into the outside
air before recharging with carbide.
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