5 inches. Such a great
difference of pressure is not permissible at the several burners, as no
type of burner retains its proper efficiency over more than a very
limited range of pressure. It is highly desirable in the case of the
ordinary Naphey type of burner that all the burners in a house should be
supplied at pressures which do not differ by more than half an inch;
hence the pipes should, wherever practicable, be of such a size that they
will pass the maximum quantity of gas required for all the burners which
will ever be in use simultaneously, when the pressure at the first burner
connected to the pipe after it enters the house is not more than half an
inch above the pressure at the burner furthermost removed from the first
one, all the burner-taps being turned on at the time the pressures are
observed. If the acetylene generating plant is not many yards from the
building to be supplied, it is a safe rule to calculate the size of pipes
required on the basis of a fall of pressure of only half an inch from the
outlet of the purifiers or initial governor to the farthermost burner.
The extra cost of the larger size of pipe which the application of this
rule may entail will be very slight in all ordinary house installations.
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