4. Gasholders exceeding 280 cubic foot in capacity must be in a detached
room or in the open and inaccessible to strangers, and at least 30 feet
from other property and with lightning conductors.
5. In case of fire the main cock must not be shut until it is ascertained
that no one remains in the room served with the gas.
6. All acetylene installations must be known to the local fire brigade.
In regard to (_c_), pipes, it is enacted that:
1. Mains for acetylene must be separated from the generating apparatus by
a cock, and under a five-minute test for pressure must not show a fall of
over eight-tenths inch when the pressure is 13.8 inches, or three times
the working pressure, whichever is greater.
2. The pipes must as a rule be of iron, though lead may be used where
they are uncovered and not exposed to risk of injury. Rubber connexions
may only be used for portable apparatus, and attached to a terminal on
the metal pipes provided with a cock, and be fastened at both ends so
that they will not slip off the nozzles.
In regard to (_d_), residues, it is enacted that special open or
well-ventilated pits must be provided for their reception when the
apparatus exceeds 300 litres per hour productive capacity.
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