15-26-400 Piping and relief valves.
   The connections from generators to service pipes shall be made with right and left thread nipples or long thread nipples with locknuts or approved unions. Unions depending on gaskets to make tight are prohibited in pipe sizes under two and one-half inches. Piping shall be arranged so that any moisture will drain to the generator, drip pots or seals. Each generator shall be provided with a gas escape or relief pipe to take care of over- or after-generation. Such gas escape or relief pipes shall be of galvanized iron of the following sizes:
Size of Machine (pounds)
Minimum Diameter of Pipe
Up to 25 inclusive
3/4 inch
26 to 100 inclusive
1 1/4 inch
101 to 200 inclusive
1 1/4 inch
Over 200
1 1/2 inch
   The relief pipe shall be made as short and as free from bends as practicable. However, if it is more than 50 feet in length or has more than four right-angle bends, a pipe of one size larger than that required by this table shall be used. It shall be substantially installed without traps and in such manner that any condensation will drain back to the generator or its component parts. It shall be carried to a suitable point outside the building and shall terminate in an approved hood or bend at least 12 feet above the ground and remote from windows or other openings into buildings, and shall be so constructed that it cannot be obstructed by rain, snow, ice, insects or birds.
(Coun. J. 12-9-92, p. 25465; Amend Coun. J. 2-7-96, p. 15616)