1 General Principles
1.0.1 The code was drawn up for the purpose of ensuring the quality of building water supply and drainage design,set the design to meet the basic requirement of safety,hygiene,applicability,economy.
1.0.2 The code is applicable to the residential area,civil building water supply and drainage design,and also applicable to the industrial building domestic water and drainage and factory roof rain-fall run-off design.
But when design the following projects,current relevant specified code or regulation must be executed:
1 Collapsible loess,perennial 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.
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.
1.0.4 Building water supply and drainage engineering design must conform with the code,in addition,must conform current relevant national standard codes requirement.
2 Terms and Symbols
2.1.1 Potable water
Water quality meets portable water hygienic standard apply to usual drinking and washing water.
2.1.2 Non-drinking water
Water not safe for drinking or for personal or culinary use,apply to wash sanitary fixture,vehicle,road sprinkling,inigate greenbelt,complement air condition circulating water.