The seal
should have twice or thrice the depth it usually has for coal-gas. The
governor should be placed where it is readily accessible to the man in
charge of the installation, but where it will not be interfered with by
irresponsible persons. In large installations, where a number of separate
buildings receive service-pipes from one long main, each service-pipe
should be provided with a governor.
GASHOLDER PRESSURE.--In drawing up the specification or scheme of an
acetylene installation, it is frequently necessary either to estimate the
pressure which a bell gasholder of given diameter and weight will throw,
or to determine what should be the weight of the bell of a gasholder of
given diameter when the gas is required to be delivered from it at a
particular pressure. The gasholder of an acetylene installation serves
not only to store the gas, but also to give the necessary pressure for
driving it through the posterior apparatus and distributing mains and
service-pipes. In coal-gas works this office is generally given over
wholly or in part to a special machine, known as the exhauster, but this
machine could not be advantageously employed for pumping acetylene unless
the installation were of very great magnitude.
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