All building drains carrying sewage or other sanitary waste which cannot discharge to the house drain by gravity shall discharge into a tight receiving tank, so located as to receive the wastes by gravity. The wastes shall be lifted and discharged into the house drain by duplex pumps for the sewage handled. Such receiving tanks shall be discharged automatically.
When sewage is lifted into the house drain by air pressure, the air delivered from the compressed air tank shall be not less than the cubic foot capacity of the receiving tank, and the minimum pressure of the air delivered shall be one pound for each foot of height the sewage is to be lifted. The receiving tank shall be tested for 50 psi.
Pumps, ejector, air compressors and air tanks shall be located so as to be readily accessible.
The discharge of the pump or ejector shall be connected directly to the house drain through a suitable wye fitting in front of the vent and shall be equipped with a suitable check valve and gate valve; the discharge pipe shall be vented when over 12 feet from a vented line, as provided in Chapter 11. A fresh air inlet shall be installed as prescribed in Section P-1106.0.
With approval of the Department, small fixture wastes which cannot discharge to the house drain by gravity shall be pumped to the house drain in front of the vent without the use of a sump or receiving tank. The discharge line shall be equipped with a check valve and gate valve installed on the pipe discharging into a wye fitting on the house drain.