It should be carried along the
walls or over the heads of people who may use the room, rather than
across the floor, or at a low level, and the acetylene should be turned
on to it only when actually required for use, and turned off at the fixed
service-pipe as soon as no longer required. Quite narrow composition
tubing, say 1/4-inch, will carry all the acetylene required for two or
three burners. The cost of a composition temporary connexion will usually
be less than one of even common rubber tubing, and it will be safer. The
composition tubing must not, of course, be sharply bent, but carried by
easy curves to the desired point, and it should be carefully rolled in a
roll of not less than 18 inches diameter when removed. If these
precautions are observed it may be used very many times.
Acetylene service-pipes should, wherever possible, be laid with a fall,
which may be very slight, towards a small closed vessel adjoining the
gasholder or purifier, in order that any water deposited from the gas
owing to condensation of aqueous vapour may run out of the pipe into that
apparatus. Where it is impossible to secure an uninterrupted fall in that
direction, there should be inserted in the service-pipe, at the lowest
point of each dip it makes, a short length of pipe turned downwards and
terminating in a plug or sound tap.
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