Standard full weight wrought iron or steel pipe free from defects shall be used in conveying gas inside of buildings. Approved seamless drawn well annealed copper, brass, or other approved nonferrous tubing with approved fittings may be used for permanent connections to stationary gas burners, but no soldered joint shall be used. All fittings for wrought iron or steel pipe (except stop-cocks or valves) shall be of best quality malleable iron or steel. Threads shall be in accordance with the American Pipe Thread Standard.
Piping shall be installed so that it is subject to no unnecessary strain and shall be securely and rigidly fastened.
When in running pipe it is necessary to cross wood joists or beams, the joists or beams shall not be notched, except by special permission of the Department.
All horizontal piping shall be graded not less than 1/4 inch to 15 feet to prevent traps and shall drain to the risers and from the risers to the meter unless the framing of the structure prevents such. (However, this does not permit violations of § 293-82.)
A drip, in which liquid condensate may collect and be removed, shall be provided at any point in the line of pipe where condensate would collect.
Drips shall not be located where the condensate will be subjected to temperature below 32° F.
Drips shall be installed only in such locations that the outlet of the drip will be readily accessible for emptying and cleaning.
The size of any drip used shall be determined by the capacity and exposure of the piping which drains to it.
The lower end of a vertical supply line, if accessible, shall be equipped with a tee (or cross) having a full-sized, plugged opening looking down to permit access for removing stoppages.
All branches shall be taken from the top or side of horizontal piping.
The installation of piping in relation to electric wiring shall be in accordance with the Electrical Code of the Village of New Haven.
Each outlet shall be securely closed gastight with a threaded iron plug or cap immediately after installation and shall be left so closed until an appliance is installed thereon. In no case shall the outlet be closed with lead caps or lead plugs.
When a gas burner is removed from an outlet, the outlet shall be securely closed gastight with a threaded iron cap or plug.
Gas for space heating units shall be supplied by an independent gas line of sufficient size, direct from the meter, to furnish adequate supply to the burners without excessive pressure drop.
Gas piping may be concealed in walls, ceilings or floors only after inspection and approval by the Department (before gas is turned on).
All gas piping which is to be concealed for more than one foot of its length shall be tested in the presence of an inspector with a five-pound air pressure, and joints and seams shall be checked with soap and water. Piping shall hold this five-pound pressure without dropping pressure for 15 minutes.
No gas piping shall be installed in chimneys, flues, ventilating shafts or ducts and elevator shafts.
Unions, runnings threads, right and left couplings, bushings and swing joints made of a combination of fittings shall not be concealed.
Piping in solid floors such as concrete shall be laid in channels in the floor, suitably covered to permit access to the piping with a minimum of damage to the building. Piping in contact with earth or other material which may corrode shall be protected against corrosion in an approved manner. Piping shall not be laid in cinders.
Only ground joint unions or other approved fittings shall be used in gas piping.
Valves and cocks used in connection with gas piping shall be of types approved for such use.