Holder tanks may be
built of brick.
2. When bare, galvanised, or lead-coated sheet-iron is used, the sides of
generators, purifiers, condensers, holder tanks, and (if present) washers
and driers must be built with the following gauges as minima:
Holder bells. All other apparatus.
Up to 7 cubic feet capacity 0.75 mm. 1.00 mm.
From 7 to 18 " 1.00 1.25
From 18 to 53 " 1.25 1.50
Above 53 " 1.50 2.00
When not constructed of cast-iron, the bottoms, covers, and "manhole"
lids must be 0.5 mm. thicker in each respective size.
In all circumstances, the thickness of the walls--especially in the case
of apparatus not circular in horizontal section--must be such that
alteration in shape appears impossible, unless deformation is guarded
against in other ways.
Generators must be so constructed that when they are being charged the
carbide cannot fall into the residue which has already been gasified; and
the residues must always be capable of easy, complete, and safe removal.
3. Generators, purifiers, and holders must be welded, riveted or folded
at the seams; soft solder is only permissible as a tightening material.
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