4. Pipes delivering acetylene, or uniting the apparatus, must be cast- or
wrought-iron. Unions, cocks, and valves must not be made of copper; but
the use of brass and bronze is permitted.
5. When cast-iron is employed, the rules of the German Gas and Water
Engineers are to be followed.
6. In generators where the whole amount of carbide introduced is not
gasified at one time, it must be possible to add fresh water or carbide
in safety, without interfering with the action of the apparatus. In such
generators the size of the gasholder space is to be calculated according
to the quantity of carbide which can be put into the generator. For every
1 kilogramme of carbide the available gasholder space must be: for the
first 50 kilos., 20 litres; for the next 50 kilos., 15 litres; for
amounts above 100 kilos., 10 litres per kilo. [One kilogramme may be
taken as 2.2 lb., and 28 litres as 1 cubic foot.]
The generator must be large enough to supply the full number of normal
(10-litre) burners with gas for 5 hours; the yield of acetylene being
taken at 290 litres per kilo. [4.65 cubic feet per lb.]
The gasholder space of apparatus where carbide is not stored must be at
least 30 litres for every normal (10-litre) flame.
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