1/2 inch pipe, 30 feet, six burners.
3/4 inch pipe, 50 feet, twenty burners.
1 inch pipe, 70 feet, thirty-five burners.
1-1/4 inch pipe, 100 feet, sixty burners.
1-1/2 inch pipe, 150 feet, one hundred burners.
2 inch pipe, 200 feet, two hundred burners.
2-1/2 inch pipe, 300 feet, three hundred burners.
3 inch pipe, 450 feet, four hundred and fifty burners,
3-1/2 inch pipe, 500 feet, six hundred burners.
4 inch pipe, 600 feet, seven hundred and fifty burners.
(_e_) Machines of the carbide-feed type must not be fitted with
continuous drain connexions leading to sewers, but must discharge into
suitable open receptacles which may have such connections.
(_f_) Piping must be thoroughly tested both before and after the
burners have been installed. It must not show loss in excess of 2 inches
within twelve hours when subjected to a pressure equal to that of 15
inches of mercury.
(_g_) Piping and connexions must be installed by persons experienced
in the installation of acetylene apparatus.
8. CARE AND ATTENDANCE.--In the care of generators designed for a
lighting period of more than five hours always clean and recharge the
generating chambers at regular stated intervals, regardless of the number
of burners actually used.
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