The taps of all other brackets are kept closed.
The gas should be allowed to flow thus through the pipes until about five
times the maximum quantity which all the burners on the system would
consume in an hour has escaped from the open brackets. The taps on these
brackets are then closed, and the burners replaced. Flexible tubing is
then connected in place of the burners to all the other brackets in the
house, and acetylene is similarly allowed to escape into the open air
from each for a quarter of an hour. All taps are then closed, and the
burners replaced; all windows in the house are left open wide for half an
hour to allow of the dissipation of any acetylene which may have
accumulated in any part of it, and then, while full pressure from the
gasholder is maintained, a tap is turned on and the gas lighted. If it
burns with a good, fully luminous flame it may be concluded that the
system of pipes is virtually free from air, and the installation may be
used forthwith as required. If, however, the flame is very feebly
luminous, or if the escaping gas does not light, lights must be
extinguished, and the pipes again blown through with acetylene into the
open air.
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