Flexible connexions between the fixed service-pipe and a semi-portable or
temporary burner may at times be required. If the connexion is for
permanent use, it must not be of rubber, but of the metallic flexible
tubing which is now commonly employed for such connexions in the case of
coal-gas. There should be a tap between the service-pipe and the flexible
connexion, and this tap should be turned off whenever the burner is out
of use, so that the connexion is not at other times under the pressure
which is maintained in the service-pipes. Unless the connexion is very
short--say 2 feet or less--there should also be a tap at the burner.
These flexible connexions, though serviceable in the case of table-lamps,
&c., of which the position may have to be altered, are undesirable, as
they increase the risk attendant on gas (whether acetylene or other
illuminating gas) lighting, and should, if possible, be avoided. Flexible
connexions may also be required for temporary use, such as for conveying
acetylene to an optical lantern, and if only occasionally called for, the
cost of the metallic flexible tubing will usually preclude its use. It
will generally be found, however, that the whole connexion in such a case
can be of composition or lead gas-piping, connected up at its two ends by
a few inches of flexible rubber tubing.
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