The acetylene is generated in the usual way and is washed, purified and
dried. Great care is used to make the gas as free as possible from all
impurities and from air. The gas is forced into containers filled with
acetone as described and is compressed to one hundred and fifty pounds to
the square inch. From these tanks it is transferred to the smaller portable
cylinders for consumers' use.
The exact volume of gas remaining in a cylinder at atmospheric temperature
may be calculated if the weight of the cylinder empty is known. One pound
of the gas occupies 13.6 cubic feet, so that if the difference in weight
between the empty cylinder and the one considered be multiplied by 13.6.
the result will be the number of cubic feet of gas contained.
The cylinders contain from 100 to 500 cubic feet of acetylene under
pressure. They cannot be filled with the ordinary type of generator as they
require special purifying and compressing apparatus, which should never be
installed in any building where other work is being carried on, or near
other buildings which are occupied, because of the danger of explosion.
Dissolved acetylene is manufactured by the Prest-O-Lite Company, the
Commercial Acetylene Company and the Searchlight Gas Company and is
distributed from warehouses in various cities.
These tanks should not be discharged at a rate per hour greater than
one-seventh of their total capacity, that is, from a tank of 100 cubic feet
capacity, the discharge should not be more than fourteen cubic feet per
hour.
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