The temperature in any part of the generator, when run at the maximum
rate for which it is designed, for a prolonged period, should not exceed
130 deg. C. This may be ascertained by placing short lengths of wire,
drawn from fusible metal, in those parts of the apparatus in which heat
is liable to be generated.
2. The generator should have an efficiency of not less than 90 per cent.,
which, with carbide yielding 5 cubic feet per pound, would imply a yield
of 4.5 cubic feet for each pound of carbide used.
3. The size of the pipes carrying the gas should be proportioned to the
maximum rate of generation, so that undue back pressure from throttling
may not occur.
4. The carbide should be completely decomposed in the apparatus, so that
lime sludge discharged from the generator shall not be capable of
generating more gas.
5. The pressure in any part of the apparatus, on the generator side of
the holder, should not exceed that of 20 inches of water, and on the
service side of same, or where no gasholder is provided, should not
exceed that of 5 inches of water.
6. The apparatus should give no tarry or other heavy condensation
products from the decomposition of the carbide.
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