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No soil or waste stack shall be smaller than the largest horizontal branch connected thereto.

The required size of branch soil wastes receiving the discharge of more than one fixture shall be determined on the basis of the total number of fixture units drained by the branch soils and waste, in accordance with the following table: Fixture Unit Load in One Branch Interval Maximum Number of Fixture Units Permitted Maximum Number of Water Closets Permitted Diameter of Branch (inches) 1 2 1 1/4 1 1/2 6 2 10 2 1/2 20 3 75 10 4 150 20 5 300 40 6 600 80 8

When provision is made for the further installation of fixtures, those provided for shall be considered in determining the required sizes of drainpipes. Construction to provide for such further installation shall be terminated with a plugged fitting or fittings at the stack, so as to form no dead end, and shall be vented. See the following article, Article XI , Vents and Venting.

The drainage from such parts of the drainage system as lie below the crown levels of the street sewer and also from parts that cannot drain by gravity into the sewer shall be disposed of through a system of subbuilding drains and shall be lifted by an approved means into the building sewer or building drain. A. The piping for such system shall be known as subbuilding drainage system. B. When subdrains do not receive the discharge of plumbing fixtures other than floor drains or drips from machinery, it shall be unnecessary for the sump or receiving tank to be airtight or vented. C. The discharge line from such ejector, pump or other mechanical device shall be provided with an accessible backwater valve, and if the gravity drainage line to which the dischar...

All building subdrains shall discharge into a tight sump or receiving tank so located as to receive the sewage by gravity. The sewage shall be lifted and discharged into the building sewer or building drain by pumps, ejectors or any equally efficient method. Such sumps or tanks shall be either automatically discharged or be of sufficient size or capacity to hold the maximum accumulated sewage and waste for a period of not less than 24 hours. This system shall have the approval of the administrative authority.

No direct connection of a steam exhaust, boiler blowoff or drip pipe shall be made with the building drainage system. Such pipes shall discharge into the top and above the line of discharge of a suitable closed tank or condenser made of wrought or cast iron, provided with a relief pipe of at least three inches in diameter extending to the outer air above the roof. Waste water, when discharged into the building drainage system, shall be at a temperature not higher than 140º F. When higher temperature exists, proper cooling methods shall be provided.

It shall be unlawful to set a water closet more than five feet from the stack, unless it is vented by no less than a two-inch pipe.

All soil and waste stacks and branches shall be provided with approved inlet fittings for fixture connections, correctly located according to the size and type of fixture proposed to be connected.

While under construction all sewer, waste, soil and vent connections shall be protected from the entrance of foreign material by plugs or caps.

Overflow and drain pipes from cisterns, expansion tanks, filters, drip pans, cooling jackets, sprinkler systems, water supply tanks and similar equipment, and the exhaust of a water lift, shall not be directly connected with any house drain, soil or waste pipe. Such pipe shall discharge upon the roof or be trapped into an open fixture or discharge as for refrigerator wastes.

It shall be unlawful to make connections between water supply pipes and the sanitary sewer system.

No portion of the drainage system installed underground or below the basement or cellar floor shall be less than two inches in diameter.

All soil, vent or waste stacks shall be installed inside of the structure.

Wastes from washing machines and similar fixtures, except washtrays, may discharge on the floor in public laundries, dye houses, bottling works and similar establishments, when located in rooms having watertight floors provided with suitable interceptors or floor drains approved by the administrative authority.

The drainage and plumbing system in each new building and new work installed in an existing building shall be separate from and independent of that of any other building except as provided below, and every building shall have an independent connection with a public or private sewer when available.

When one building stands in the rear of another building on the same interior lot and no private sewer is available or can be constructed to the rear building through an adjoining alley, court, yard or driveway, the house drain from the front building may be extended to the rear building and the whole will be considered as one house drain.

Old building sewers and drains may be used in connection with new buildings or new plumbing only when they are found on examination by the Inspector to conform in all respects to the requirements governing new sewers or drains as prescribed in this chapter. If the old work is found defective, the proper administrative authority shall notify the owner to make the necessary changes to conform with this chapter.

Each system of piping shall be laid in a separate trench, provided that the drainage trenches may be benched for the lighter piping (water service) if not in violation of any City regulation prescribed for their installation. Where the double system of drainage is installed, the sanitary and storm sewer or drain may be laid side by side in one trench.

All building sewer connections shall be made with cast-iron extra-heavy pipe, lead and oakum joints, for cut in connections, and the M.D. connector and one-eighth bend shall be used from the connection to the main sewer to the property line. The M.D. connector shall be completely covered and molded with cement around the main sewer and connector.

Location of all house sewers entering the main sewer shall be measured from manhole on main sewer and at what depth. This measurement shall be filed with the plumbing plan. All house drains shall be measured and a drawing made showing the layout of the drainage system under the cellar floor. This drawing shall be made and the licensed plumber must have it ready when he calls the Inspector for inspection. All drains shall be laid a sufficient depth to be protected from frost. Drawing shall be on ten-by-eight paper.