1 General
1.0.1 This code has been prepared for the purpose of ensuring the quality of building water supply and drainage design, and setting the design to meet the basic requirement of safety, hygiene, applicability, economy.
1.0.2 This code is applicable to the water supply and drainage design of residential area, public building area, civil building, and also applicable to the domestic water and drainage and factory roof rain-fall run-off design of industrial building.
But when designing the following projects, current relevant specified code or regulation must be complied:
1 Collapsible soil, perennially frozen soil and expansive soil region building.
2 Building with anti-seismic intensity more than 9.
3 Mineral water cure, civil air defense works.
4 Industrial production water supply and drainage.
5 Building reclaimed water and rainwater utilization.
1.0.3 Building water supply and drainage design must meet the application demands and also provide convenience for construction installation, operation management, maintenance inspection and safety protection.
1.0.3A This code specifies the basic requirements for building water supply and drainage design. In case that this code is in conflict with the national laws and administrative regulations, the latter will prevail.
1.0.4 Building water supply and drainage engineering design must comply with this code, in addition, must comply with the requirements of the current relevant standards and codes of the country.
2 Terms, Symbols
2.1 Terms
2.1.1 Drinking water
Water quality meets drinking water hygienic standard apply to usual drinking and washing water.
2.1.2 Non-drinking water
Water mot safe for drinking or for personal or culinary use, apply to wash sanitary fixture, vehicle, road sprinkling, irrigate greenbelt, and complement air condition circulating water.
2.1.3 Hourly variation coefficient
Ratio between maximum daily maximum hourly water consumption and average hourly water consumption.
2.1.4 Maximum hourly water consumption
The maximum water consumption per hour in the peak hours in the maximum daily water consumption day,
2.1.4A Average hourly water consumption
The average water consumption per hour in the maximum daily water consumption day
2.1.5 Backflow pollution
A pollution condition which may occur in the drinking water distribution system due to back-pressure back flow or siphonage back flow.
2.1.5A Back-pressure back flow
Due to pressure loss at upstream of the water pipeline, causing non-drinking water or other liquid, mixture flow into drinking water supply system.
2.1.5B Siphonage back flow
Due to negative pressure in the pipeline, causing a reversal of flow or mixture flow from sanitary fixture or water storage receptor to domestic water supply system.
2.1.6 Air gap
In water distribution system, the vertical space distance between the lowest point of water supply pipeline outlet and the receptor which water overflows; in drainage system, the vertical space distance between the lowest point of indirect drainage facility or storage outlet and the receptor which water overflows.
2.1.7 Flood-level rim
The edge of the receptor which water overflows.
2.1.7A Backflow preventer
A device adopting check valve components to prevent the backflow in the water supply pipeline.
2.1.7B Vacuum breaker
A device that can introduce the air pressure to eliminate the siphon backflow in the water supply pipeline
2.1.8 Service pipe
This pipe from the water main in the street to building inside or municipal pipeline of supply to the building water supply network.
2.1.9 Inter-building pipe
Water supply and drainage pipeline laying around the building, directly connect with building inlet and outlet pipes.
2.1.10 Inlet pipe
Pipe between water meter in building and domestic water supply pipeline inside building.
2.1.11 Vertical division zone
The building water supply system is vertically divided into a certain number of zones.
2.1.12 Parallel water supply
Mode of the water supply system in vertical division zone with independent pressurization (depressurization) system.
2.1.13 Series water supply
Mode of the water supply system in vertical division zone with pressurization (depressurization) system connected in series way in all zones.
2.1.13A Pressure superposed water supply
1 General
2 Terms, Symbols
2.1 Terms
2.2 Symbols
3 Water supply
3.1 Rated water consumption and water pressure
3.2 Water quality and water quality pollution protection
3.3 System selection
3.4 Pipe material, fittings and water meter
3.5 Piping layout and pipe laying
3.6 Design flow and hydraulic calculation of pipe
3.7 Water tower, Water tank, Reservoir
3.8 Pressurizing equipment, pump house
3.9 Swimming pool and aquatic recreation pool
3.10 Cooling tower and circulation cooling water
3.11 Waterscape
4 Water Drainage
4.1 Selection of drainage system
4.2 Sanitary fixture and water lock
4.3 Pipe location and pipelining
4.4 Calculation of drainage pipe
4.5 Pipe material fittings and inspection well
4.6 Vent pipe
4.7 Sewage pump and catch pit
4.8 Local domestic sewage disposal
4.9 Rain Water
5 Hot water and drinking water supply
5.1 Rated consumption, temperature and quality of hot water
5.2 Selection of hot water supply system
5.3 Calculation of heat consumption, hot water quantity and heating equipment hot supply
5.4 Water heating and storage
5.5 Calculation of net work
5.6 Pipe, fitting and pipeline laying
5.7 Potable water supply
Appendix A Residential district underground pipeline (structure) minimum net clearance between lines
Appendix B Valves and screw fittings resistance loss converted
Appendix C Water supply pipe section sanitary fixtures water supply equivalent simultaneously outflow probability calculated equation, αc coefficient values table
Appendix D Water supply pipe section designed second flow calculation table
Appendix E Drinking water number of taps simultaneously use in
Explanation of Wording in This Code
