I. Piping should be designed to meet the following requirements:
(1) The water supply pipe distribution outlet should not be flooded by any liquid or impurity.
(2) water supply pipe distribution outlet above the overflow level of water equipment, the minimum air gap, do not be less than 2.5 times the diameter of the water supply pipe at the distribution outlet.
(3) When it is not possible to set the minimum air gap for special appliances and production water equipment, anti-fouling isolators should be installed or other effective isolation measures should be taken.
Two, domestic drinking water piping can not be directly connected to the toilet (tank).
Three, buried potable water storage tank and septic tank net distance, should not be less than 10 m. When the net distance can not be guaranteed, should be taken when the potable water storage tank is not contaminated measures.
Four, living or domestic water and other water pools, tanks, pools (tanks) should be used in the form of an independent structure, do not use the building's substructure as a pool wall and tank wall.
V. The following equipment and containers shall not be directly connected to the sewage and waste water piping system, should take the indirect drainage:
(1) domestic drinking water storage tank (pool) of the drain pipe and overflow pipe.
(2) Drainage from food preparation and washing equipment in the kitchen.
(3) Medical sterilization and disinfection equipment drainage.
(4) Drainage from air-conditioning equipment such as evaporative coolers and air cooling towers.
(5) Drainage of cold storage rooms for storing food or beverages, ground drainage of cold storage warehouses, and drainage of chiller frost dissolving water pans.