3. The limit of pressure in service-pipes, within the house, shall not
exceed 10 inches of water.
4. Except when used for special industrial purposes, such as oxy-
acetylene welding, factories, lighthouses, portable apparatus containing
not more than four pounds of carbide, and other special conditions as
approved by the Association, the acetylene plant, such as generators,
storage-holders, purifiers, scrubbers, and for washers, shall be in a
suitable and well-ventilated outhouse, in the open, or in a lean-to,
having no direct communication with a dwelling-house. A blow-off pipe or
safety outlet shall be arranged in such a manner as to carry off into the
open air any overmake of gas and to open automatically if pressure be
increased beyond 20 inches water column in the generating chamber or
beyond 10 inches in the gasholder, or beyond the depth of any fluid seal
on the apparatus.
5. Generators shall have sufficient storage capacity to make a serious
blow-off impossible.
6. Generators and apparatus shall be made of sufficiently strong material
and be of good workmanship, and shall not in any part be constructed of
unalloyed copper.
7. It shall not be possible under any conditions, even by wrong
manipulation of cocks, to seal the generating chamber hermetically.
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