For the feed pipes to the torch lines the following pipe sizes are
recommended.

3/8 inch pipe. 26 feet long. 2 cubic feet per hour.
1/2 inch pipe. 30 feet long. 4 cubic feet per hour.
3/4 inch pipe. 50 feet long. 15 cubic feet per hour.
1 inch pipe. 70 feet long. 27 cubic feet per hour.
1-1/4 inch pipe. 100 feet long. 50 cubic feet per hour.
1-1/2 inch pipe. 150 feet long. 65 cubic feet per hour.
2 inch pipe. 200 feet long. 125 cubic feet per hour.
2-1/2 inch pipe. 300 feet long. 190 cubic feet per hour.
3 inch pipe. 450 feet long. 335 cubic feet per hour.

When drainage is possible into a sewer, the generator should not be
connected directly into the sewer but should first discharge into an open
receptacle, which may in turn be connected to the sewer.

No valves or pet cocks should open into the generator room or any other
room when it would be possible, by opening them for draining purposes, to
allow any escape of gas. Any condensation must be removed without the use
of valves or other working parts, being drained into closed receptacles. It
should be needless to say that all the piping for gas must be perfectly
tight at every point in its length.

_Safety Devices._--Good generators are built in such a way that the
operator must follow the proper order of operation in charging and cleaning
as well as in all other necessary care. It has been mentioned that the gas
pressure is released or shut off before it is possible to fill the water
compartment, and this same idea is carried further in making the generator