Standard for design of building water supply and drainage
1 General provisions
1.0.1 This standard is developed in order to ensure the design quality of building water supply and drainage engineering and meet the basic requirements of safety, sanitation, applicability, economy and green.
1.0.2 This standard is applicable to the design of domestic water supply and drainage engineering in civil buildings, industrial buildings and sub-districts and the design of rainwater drainage engineering in sub-districts.
1.0.3 Where the height of the building exceeds 250m, the design of water supply and drainage system of the building shall meet the provisions of this standard, for which special research and demonstration shall be carried out.
1.0.4 The building water supply and drainage design shall not only meet the use requirements, but also provide convenient conditions for construction and installation, operation management, maintenance and check, and safety protection.
1.0.5 For the design of building water supply and drainage engineering, this standard shall be implemented and the requirements of current relevant standards of the nation shall be met.
2 Terms and symbols
2.1 Terms
2.1.1
drinking water
domestic water with its quality meeting the requirements for daily drinking, washing, etc. specified in national standards for drinking water quality
2.1.2
non-drinking water
water, other than drinking water, used for flushing toilets, washing cars, sprinkling roads, watering and afforesting, and supplementing air conditioning circulating water and landscape water
2.1.3
secondary water supply
water supply mode in which water is supplied to users or used by oneself through facilities for storage, pressurization, etc. when the demand of civil and industrial buildings on drinking water pressure and volume exceeds the capability of the water supply network of public or self-constructed water supply facilities
2.1.4
hourly variation coefficient
ratio of maximum hourly water consumption to average hourly water consumption
2.1.5
maximum hourly water consumption
hourly water consumption during the maximum daily water consumption period
2.1.6
average hourly water consumption
average hourly water consumption during the maximum daily water consumption period
2.1.7
backflow pollution
pollution of domestic water supply system caused by back-pressure back flow or siphonage back flow
2.1.8
back-pressure back flow
backflow caused by the change of downstream pressure of the water supply system which causes the water pressure at the water use end to be higher than that at the water supply end
2.1.9
siphonage back flow
backflow of water or liquid mixture from plumbing fixtures or water receiver to domestic water supply system caused by the negative pressure in the water supply piping
2.1.10
air gap
the vertical spatial distance between the lowest point of the outlet of the pipeline or tap outlet and the overflow level of the water equipment in the case of a water supply system or the vertical spatial distance between the lowest point of the building drain opening of an indirect drainage equipment or container and the overflow level of the water receiver in the case of a drainage system
2.1.11
flood-level rim
overflow upper edge of fixtures
2.1.12
backflow preventer
device consisting of non-return components that can prevent the water flow in the water supply piping from flowing back
2.1.13
vacuum breaker
device that is able to introduce atmospheric pressure into the water supply piping to avoid backflow of water in such water supply piping due to siphonage
2.1.14
service pipe
pipe section connecting the municipal piping to the water supply network in sub-district, or pipe section introducing the water supply inter-building pipe in sub-district into the building
2.1.15
inter-building pipe
GB 50015-2019 Standard for design of building water supply and drainage English
Foreword ii
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Water supply
3.1 General requirements
3.2 Rated water consumption and water pressure
3.3 Water quality and contamination prevention
3.4 System selections
3.5 Pipes, appurtenances and water meters
3.6 Piping layout and installation
3.7 Design flow and pipe hydraulic calculation
3.8 Water tanks and reservoirs
3.9 Pressurizing equipment and pump house
3.10 Swimming pools and aquatic recreation pools
3.11 Circulating cooling water and cooling towers
3.12 Waterscape
3.13 Outdoor water supply in sub-district
4 Sanitary wastewater
4.1 General requirements
4.2 Drainage systems selection
4.3 Plumbing fixtures, floor drains and traps
4.4 Piping layout and installation
4.5 Hydraulic calculation of drainage piping
4.6 Pipes, fittings
4.7 Vent pipes
4.8 Sewage pumps and sump
4.9 Small sanitary waste treatment
4.10 Sanitary wastewater in sub-district
5 Rain drainage
5.1 General requirements
5.2 Building rainwater
5.3 Outdoor rainwater in sub-district
6 Hot water and drinking water supply
6.1 General requirements
6.2 Rated consumption, temperature and hot water quality
6.3 Hot water supply systems selections
6.4 Calculation of heat consumption, hot water consumption and heat supply of heating equipment
6.5 Water heating and storage
6.6 Hot water supply systems of solar and heat pump
6.7 Calculation for hot water pipe net
6.8 Pips, appurtenances and piping installation
6.9 Drinking water supply
Annex A Hazard degree of backflow & the selection of backflow prevention facilities
Annex B Values of coefficient αc in the formula for calculating simultaneous outflow probability of water supply fixture unit in the water supply pipe section
Annex C Calculation of design peak flow of water supply pipe section
Annex D Equivalent length for friction loss of valves and threaded fittings
Annex E Minimum clearance between underground pipelines (structures) for sub-districts
Annex F Calculation for the discharge volume of roof rainwater overflow facilities
Annex G Maximum design discharge capacity of vertical pipes for gravity flow system
Annex H Distribution of solar energy resources in China and their corresponding characteristics
Annex J Calculation of the number of drinking water taps for simultaneous use
Explanation of wording in this standard
List of quoted standards
Standard for design of building water supply and drainage
1 General provisions
1.0.1 This standard is developed in order to ensure the design quality of building water supply and drainage engineering and meet the basic requirements of safety, sanitation, applicability, economy and green.
1.0.2 This standard is applicable to the design of domestic water supply and drainage engineering in civil buildings, industrial buildings and sub-districts and the design of rainwater drainage engineering in sub-districts.
1.0.3 Where the height of the building exceeds 250m, the design of water supply and drainage system of the building shall meet the provisions of this standard, for which special research and demonstration shall be carried out.
1.0.4 The building water supply and drainage design shall not only meet the use requirements, but also provide convenient conditions for construction and installation, operation management, maintenance and check, and safety protection.
1.0.5 For the design of building water supply and drainage engineering, this standard shall be implemented and the requirements of current relevant standards of the nation shall be met.
2 Terms and symbols
2.1 Terms
2.1.1
drinking water
domestic water with its quality meeting the requirements for daily drinking, washing, etc. specified in national standards for drinking water quality
2.1.2
non-drinking water
water, other than drinking water, used for flushing toilets, washing cars, sprinkling roads, watering and afforesting, and supplementing air conditioning circulating water and landscape water
2.1.3
secondary water supply
water supply mode in which water is supplied to users or used by oneself through facilities for storage, pressurization, etc. when the demand of civil and industrial buildings on drinking water pressure and volume exceeds the capability of the water supply network of public or self-constructed water supply facilities
2.1.4
hourly variation coefficient
ratio of maximum hourly water consumption to average hourly water consumption
2.1.5
maximum hourly water consumption
hourly water consumption during the maximum daily water consumption period
2.1.6
average hourly water consumption
average hourly water consumption during the maximum daily water consumption period
2.1.7
backflow pollution
pollution of domestic water supply system caused by back-pressure back flow or siphonage back flow
2.1.8
back-pressure back flow
backflow caused by the change of downstream pressure of the water supply system which causes the water pressure at the water use end to be higher than that at the water supply end
2.1.9
siphonage back flow
backflow of water or liquid mixture from plumbing fixtures or water receiver to domestic water supply system caused by the negative pressure in the water supply piping
2.1.10
air gap
the vertical spatial distance between the lowest point of the outlet of the pipeline or tap outlet and the overflow level of the water equipment in the case of a water supply system or the vertical spatial distance between the lowest point of the building drain opening of an indirect drainage equipment or container and the overflow level of the water receiver in the case of a drainage system
2.1.11
flood-level rim
overflow upper edge of fixtures
2.1.12
backflow preventer
device consisting of non-return components that can prevent the water flow in the water supply piping from flowing back
2.1.13
vacuum breaker
device that is able to introduce atmospheric pressure into the water supply piping to avoid backflow of water in such water supply piping due to siphonage
2.1.14
service pipe
pipe section connecting the municipal piping to the water supply network in sub-district, or pipe section introducing the water supply inter-building pipe in sub-district into the building
2.1.15
inter-building pipe
Contents of GB 50015-2019
GB 50015-2019 Standard for design of building water supply and drainage English
Foreword ii
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Water supply
3.1 General requirements
3.2 Rated water consumption and water pressure
3.3 Water quality and contamination prevention
3.4 System selections
3.5 Pipes, appurtenances and water meters
3.6 Piping layout and installation
3.7 Design flow and pipe hydraulic calculation
3.8 Water tanks and reservoirs
3.9 Pressurizing equipment and pump house
3.10 Swimming pools and aquatic recreation pools
3.11 Circulating cooling water and cooling towers
3.12 Waterscape
3.13 Outdoor water supply in sub-district
4 Sanitary wastewater
4.1 General requirements
4.2 Drainage systems selection
4.3 Plumbing fixtures, floor drains and traps
4.4 Piping layout and installation
4.5 Hydraulic calculation of drainage piping
4.6 Pipes, fittings
4.7 Vent pipes
4.8 Sewage pumps and sump
4.9 Small sanitary waste treatment
4.10 Sanitary wastewater in sub-district
5 Rain drainage
5.1 General requirements
5.2 Building rainwater
5.3 Outdoor rainwater in sub-district
6 Hot water and drinking water supply
6.1 General requirements
6.2 Rated consumption, temperature and hot water quality
6.3 Hot water supply systems selections
6.4 Calculation of heat consumption, hot water consumption and heat supply of heating equipment
6.5 Water heating and storage
6.6 Hot water supply systems of solar and heat pump
6.7 Calculation for hot water pipe net
6.8 Pips, appurtenances and piping installation
6.9 Drinking water supply
Annex A Hazard degree of backflow & the selection of backflow prevention facilities
Annex B Values of coefficient αc in the formula for calculating simultaneous outflow probability of water supply fixture unit in the water supply pipe section
Annex C Calculation of design peak flow of water supply pipe section
Annex D Equivalent length for friction loss of valves and threaded fittings
Annex E Minimum clearance between underground pipelines (structures) for sub-districts
Annex F Calculation for the discharge volume of roof rainwater overflow facilities
Annex G Maximum design discharge capacity of vertical pipes for gravity flow system
Annex H Distribution of solar energy resources in China and their corresponding characteristics
Annex J Calculation of the number of drinking water taps for simultaneous use
Explanation of wording in this standard
List of quoted standards
