San Francisco County Municipal Code Part I Drainage Systems

SECTION 701.0 – GENERAL 701.2(2)(a) Revise this section as follows: 701.2(2)(a)[ ← ] ABS and PVC installations are limited to not more than two stories of areas of commercial or private residential accommodations. 701.2(3) Revise this section as follows: 701.2(3) No vitrified clay pipe or fittings shall be used aboveground or where pressurized by a pump or ejector or underground within the foundation line of the building. They shall be kept not less than 12 inches (305 mm) belowground. 701.2(7) Add the following section: 701.2(7) Copper tubing shall not be used for urinal drainage or applications which are detrimental to the integrity of copper tubing. SECTION 706.0 – CHANGES IN DIRECTION OF DRAINAGE FLOW 706.4 Revise this section as follows: 706.4 Vertical to Horizontal. Vertical drainage lines connecting with horizontal drainage lines shall enter through 45 degree (0.79 rad) wye branches, combination wye and one-eighth bend branches, or other approved fittings of equivalent sweep. Branches or offsets of 60 degrees (1.05 rad) shall be permitted to be used where installed in a true vertical position. In buildings more than three stories in height, any fixture within 10 feet (304 mm) of the connection of the vertical to horizontal change shall enter the horizontal drainage line at least 10 feet (304 mm) downstream from the change or may connect into the next vertical downstream line. SECTION 710.0 – DRAINAGE OF FIXTURES LOCATED BELOW THE NEXT UPSTREAM MANHOLE OR BELOW THE MAIN SEWER LEVEL

710.1.1 Add the following section: 710.1.1 Drainage of Fixtures Located Below the Fresh Air Inlet. Where a fixture is installed with the flood rim level equal to or lower than the elevation of the fresh air inlet serving the house trap, the piping serving the fixture shall be protected by installing an approved type of backwater valve. Where a fixture is installed with the flood rim level higher than the elevation of the fresh air inlet serving the house trap, the fixture shall not discharge through such backwater valve.