7. The gasholder must be fitted with an appliance for removing any gas
which may be generated (especially when the apparatus is first brought
into action) after the available space is full. This vent must have a
diameter at least equal to the inlet pipe of the holder.
8. Acetylene plant must be provided with purifying apparatus which
contains a proper purifying material in a suitable condition.
9. The dimensions of subsidiary apparatus, such as washers, purifiers,
condensers, pipes, and cocks must correspond with the capacity of the
plant.
10. Purifiers and washers must be constructed of materials capable of
resisting the attack of the substances in them.
11. Every generator must bear a plate giving the name of the maker, or
the seller, and the maximum number of l0-litre lights it is intended to
supply. If all the carbide put into the generator is not gasified at one
time, the plate must also state the maximum weight of carbide in the
charge. The gasholder must also bear a plate recording the maker's or
seller's name, as well as its storage capacity.
12. Rules 1 to 11 do not apply to portable apparatus serving up to two
lights, or to portable apparatus used only out of doors for the lighting
of vehicles or open spaces.
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