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GB 50788-2012 English PDF (GB50788-2012)

GB 50788-2012 English PDF (GB50788-2012)

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GB 50788-2012: Technical code for water supply and sewerage of urban

This code is prepared with a view to guarantee the urban water safety and water environment quality, maintain the health water circulation and regulate the basic function and technical performance of urban water supply and drainage systems and facilities.
GB 50788-2012
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
UDC
P GB 50788-2012
Technical Code for Water
Supply and Sewerage of Urban
ISSUED ON: MAY 28, 2012
IMPLEMENTED ON: OCTOBER 1, 2012
Jointly issued by: Ministry of Housing and Urban-Rural Development of
the People's Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of
China.
Table of Contents
Foreword ... 4
1 General Provisions ... 8
2 Basic Requirements ... 9
3 Water Supply ... 11
3.1 General Requirements??...??11
3.2 Water Source and Water Abstraction??...??11
3.3 Water Pumping Station??...??12
3.4 Water Transmission and Distribution Pipe Network??...??12
3.5 Water Treatment??...??13
3.6 Building Water Supply??...??14
3.7 Building Hot Water and Purified Drinking Water??...??15
4 Wastewater ... 16
4.1 General Requirements??...??16
4.2 Building Drainage??...??17
4.3 Sewer??...??17
4.4 Drainage Pumping Station??...??18
4.5 Sewage Treatment...??19
4.6 Sludge Treatment??...??19
5 Reuse of Sewage and Use of Rainwater ... 21
5.1 General Requirements??...??21
5.2 Source of Reclaimed Water and Its Water Quality??...??21
5.3 Water Reclamation Safety Guarantee??...??21
5.4 Use of Rainwater??...??22
6 Structure ... 23
6.1 General Requirements??...??23
6.2 Building??...??25
6.3 Pipe??...??25
6.4 Structural Earthquake-resistance??...??26
7 Machinery, Electric and Automation ... 28
7.1 General Requirements??...??28
7.2 Mechanical Equipment??...??28
7.3 Electrical System??...??29
7.4 Instrument and Automation Control System??...??29
Explanation of Wording in This Code ... 31
List of Quoted Standards ... 32
1 General Provisions
1.0.1 This code is prepared with a view to guarantee the urban water safety and water environment quality, maintain the health water circulation and regulate the basic function and technical performance of urban water supply and drainage systems and facilities.
1.0.2 This code is applicable to the planning, investigation, design, construction, acceptance, running, maintenance and management, etc. of systems and
facilities relevant to urban water supply, drainage, wastewater reclamation and reuse and rainwater utilization.
For urban water supply, systems and facilities for water intaking, delivery, purification, distribution and building water supply are included; for urban sewerage, systems and facilities for building drainage as well as collection, delivery, treatment and disposal of rainwater and sewage are included; for sewage reclamation and reuse and rainwater utilization, urban sewage
reclamation and reuse and rainwater utilization systems as well as water and rainwater utilization facilities in local area, residential area and building are included.
1.0.3 The planning, investigation, design, construction, running, maintenance and management of urban water supply and drainage systems and facilities shall comply with the principles of making safety water supply, service function guarantee, resource conservation and environment protection keep
harmonious development with the natural circulation of water.
1.0.4 Besides meeting those specified in this code, the planning, investigation, design, construction, running, maintenance and management of urban water supply and drainage systems and facilities shall also comply with those stipulated in the current relevant standards of the nation; when relevant current standards are inconsistent with those specified in this code, those specified in this code shall be observed.
2 Basic Requirements
2.0.1 Water supply and drainage system compatible with the development
demands must be constructed in the urban to maintain the ecological security of water environment.
2.0.2 Urban water supply and drainage planning shall be based on the master plans of the region, urban and town, and shall be in harmony with water resource planning, water pollution control planning, ecological and
environmental protection planning and disaster prevention planning, etc. 2.0.3 Urban water supply and drainage facilities shall be provided with capacities for responding to natural disaster, accident disaster, public health event, social security event and other emergency incidents.
2.0.4 The flood control criteria for urban water supply and drainage facilities shall not be less than the corresponding fortification requirements of serviced town and shall have appropriate safety margin.
2.0.5 Qualified materials and facilities must be used for urban water supply and drainage facilities. Meanwhile, the materials and facilities of urban water supply facilities must meet sanitary security requirements.
2.0.6 Water-saving and energy-saving technology, equipment, instrument and product shall be adopted for urban water supply and drainage system.
2.0.7 In urban water supply and drainage system, construction relevant to production safety, environmental protection and water-saving facility shall be designed, constructed and put into operation together with the principal part of the project.
2.0.8 Corresponding operation standards shall be prepared for the running, maintenance and management of urban water supply and drainage systems
and facilities and be enforced strictly.
2.0.9 The construction and management for relevant facilities must be carried out during the construction and running of urban water supply and drainage engineering to meet the requirements for production safety, occupational sanitation safety, fire safety and safety and security.
2.0.10 Noise, wastewater, exhaust and solid wastes produced during the
construction and running of urban water supply and drainage engineering shall not cause harm to surrounding environment and personal health and measures shall be taken to reduce the discharge of greenhouse gases.
2.0.11 Inflammable, explosive and toxic dangerous chemicals used and
3 Water Supply
3.1 General Requirements
3.1.1 Urban water supply system shall be provided with the ability of assuring continuous and uninterrupted water supply to urban and meeting the water utilization requirements by urban regarding water quality, water volume and water pressure.
3.1.2 The water quality of drinking water in urban water supply must comply with the national current standard ?€?Standards for Drinking Water Quality?€?. 3.1.3 Water supply scale shall guarantee the maximum daily water
consumption within the term of years specified by the scope of water supply. 3.1.4 Urban water consumption shall be in harmony with urban water resources. 3.1.5 Urban water supply planning shall, based on science forecasting of urban water consumption, reasonably develop and utilize water resources, coordinate the layout of water supply facilities and guide the water supply engineering construction correctly.
3.1.6 Urban water supply system shall be provided with sound water quality monitoring system, qualified testing personnel and instrument and equipment to implement strict and effective supervision and control over water quality. 3.1.7 Complete and accurate water quality monitoring file shall be established for urban water supply system.
3.1.8 Water supply and utilization must be measured.
3.1.9 When urban water supply system requires to cut off the water supply, notification shall be given in advance or timely.
3.1.10 When works of urban water supply system are reconstructed and
extended, it is required to ensure the safety of urban water supply and protect adjacent facilities.
3.2 Water Source and Water Abstraction
3.2.1 The selection of urban water supply source shall be based on the
evaluation report of water resources investigation and ensure the reliability of water intake volume and water quality; blind exploitation is strictly prohibited. 3.2.2 Protected area shall be defined in urban water supply source region and corresponding water quality safety precautions shall be taken.
are set and accident water consumption can be ensured, single pipe can be adopted.
3.4.4 For the selection of long-distance water delivery pipe system, technical and economic comparison as well as safety appraisal shall be made in terms of water transmission line, water delivery mode, pipe material and pipe diameter, etc. and hydraulic transition process analysis for the piping system shall be made, and combined water hammer protective measures shall be taken.
3.4.5 The main pipe of urban water distribution network shall be in ringed arrangement.
3.4.6 The leakage rate of water supply network shall be reduced and be
controlled within the allowable range.
3.4.7 It is strictly forbidden to connect water supply network with non-drinking water pipe, connect with self-construction sources arbitrarily and pass through toxic pollution area; safety protection measures shall be taken if passing through corrosive section.
3.4.8 Water supply network shall be subjected to optimization design, optimized regulation management and energy consumption reduction.
3.4.9 The distance from water transportation and distribution pipe to buildings (structures) and other pipes and their positions shall ensure safety water supply. 3.4.10 When water transportation and distribution pipes pass through railway, highway and urban road, facility security shall be ensured; when they are buried at river bottom, the water velocity in pipe shall be greater than the non-silting velocity and pipe shall not be destroyed by flood erosion and shall not influence navigation.
3.4.11 Anti-freezing measures shall be taken for the pipe laid in the area with frozen hazard.
3.4.12 Before the final acceptance of pressure pipe, hydraulic testing shall be carried out. Drinking water pipes shall be washed and sterilized before running. 3.5 Water Treatment
3.5.1 Urban water plant processes the raw water; the quality in effluent water shall not be lower than the requirements of the current national standard Standards for Drinking Water Quality and necessary margin shall be reserved. 3.5.2 The plan layout and vertical design of urban water plant shall meet the functional, running and maintenance requirements of all buildings (structures); convenient and safe passing shall be provided between main buildings
3.6.7 Disinfection facilities shall be arranged for the water reservoir (tank) of drinking water and water supply facilities must be cleaned and disinfected before being placed in operation.
3.6.8 Fire water supply system and fire extinguishing facilities shall be allocated reasonably according to the building purpose, function, scale, importance and fire characteristics and fire hazard, etc.
3.6.9 Fire water sources must be safety and reliable.
3.6.10 The water volume and pressure of fire water supply system shall meet the operation requirements.
3.6.11 Safety protective measures shall be taken for the structure, station room, equipment and pipe network, etc. of fire water supply system and their power supply shall be safe and reliable.
3.7 Building Hot Water and Purified Drinking Water
3.7.1 For the determination of building hot water quota, it shall match the quota of building water supply; heat source of building hot water shall be determined according to local renewable energies and thermal resource conditions in combination with the requirements of users.
3.7.2 Building hot water supply shall ensure that the water quality of water utilization terminal conforms to the requirements of current national drinking water standard.
3.7.3 The temperature of building hot water shall meet the operation
requirements; anti-scald measures shall be taken for the hot water supply in special building.
3.7.4 Water heating and storage equipment and hot water supply system shall ensure safe and reliable water supply.
3.7.5 Necessary safety devices shall be arranged for hot water supply pipe system.
3.7.6 The water quality in the user side of dedicated drinking water system shall meet the relevant requirements of the current professional standard ?€?Water Quality Standards for Fine Drinking Water?€? (CJ 94) and strict guarantee measures shall be taken.
4.2 Building Drainage
4.2.1 Arrangement of building drainage equipment and laying of pipe shall not pollute the drinking water and food, shall not endanger the building structure and equipment and shall not affect the living condition.
4.2.2 When the sanitary ware without water seal is connected with sewage pipe or other drainage pipes which may produce harmful gas, effective measures shall be taken to prevent the leakage of harmful gas.
4.2.3 The sanitary ware and floor drain in basement and semibasement shall not be connected with the upper drainage pipes; pressure drainage system shall be adopted and safe and reliable discharge of sewage and wastewater shall be ensured.
4.2.4 For the site where it is unable to discharge rainwater by gravity flow such as the sunk square, and exit and entrance of underground garage, pressure flow rain drainage system shall be arranged to ensure the timely and safe discharge of rainwater.
4.2.5 The arrangement of septic tank shall not contaminate the underground water intake construction and the living water reservoir.
4.2.6 For the sewage of medical institution, corresponding treatment process shall be adopted according to the sewage property and discharge condition; and disinfection treatment must be carried out.
4.2.7 The arrangement and drainage capacity of rainwater drainage and
overflow facilities of building roof shall not affect the roof structure, wall and personnel safety and the rainwater in design recurrence interval shall be timely discharged.
4.3 Sewer
4.3.1 Sewer shall convey the rainwater and sewage economically and
reasonably and shall be provided with the following performances:
1 The drainage shall be unblocked;
2 The public sanitation and public health shall not be endangered;
3 Adjacent buildings and public utilities shall not be endangered;
4 The maximum design fullness of gravity flow sewage pipe shall guarantee safety.
4.3.2 Independent drainage system shall be arranged for the separate grade measures for clearing the accumulated sediment.
4.5 Sewage Treatment
4.5.1 Sewage treatment plant shall be provided with the function of effectively reducing the urban water pollutant and the discharged water, mud and gas shall meet the requirements of relevant current national standards.
4.5.2 For the sewage treatment plant, sewage treatment degree shall be
scientifically determined and treatment process shall be reasonably selected according to the national discharge standard, water quality of sewage, purpose of the water after treatment and the like.
4.5.3 The overall design of sewage treatment plant shall be beneficial to reduce the running energy consumption, reduce the effect of bad smell and noise on operation management personnel.
4.5.4 Sewage treatment plant in combined system shall be provided with the capacity for treating interception initial rainwater.
4.5.5 The natural treatment of sewage shall not reduce the quality of
surrounding environment and shall not pollute the underground water.
4.5.6 The water outlet of urban sewage treatment plant shall be discharged after disinfection and the sewage disinfection site shall be provided with safety protective measures.
4.5.7 Facilities for measuring the water quality and monitoring the water quality shall be arranged for the sewage treatment plant.
4.6 Sludge Treatment
4.6.1 Reducing, stabilizing and innocent treatment as well as safe and effective disposal shall be carried out for the sludge.
4.6.2 For the site with fire or explosion hazard such as sludge digestion tank, sewage gas pipe, gas tank and sewage gas combustion apparatus,
precautionary safety measures shall be taken.
4.6.3 Sewage gas shall be comprehensively utilized and shall not be arbitrarily discharged into the atmosphere.
4.6.4 Sludge concentration and dewatering room shall be well-ventilated and anti-skid measures shall be taken for the medicine dissolving site.
4.6.5 Measures for seepage prevention and leachate collection and disposal shall be taken for the sludge composting site to prevent the water body pollution. 5 Reuse of Sewage and Use of Rainwater
5.1 General Requirements
5.1.1 Urban shall compile reclaimed water and rainwater use planning of urban according to the overall planning and water resources condition.
5.1.2 Urban reclaimed water and rainwater use engineering shall meet users?€? requirements for water quality, water quantity and water pressure.
5.1.3 Urban reclaimed water and rainwater use engineering shall ensure the water safety.
5.2 Source of Reclaimed Water and Its Water Quality
5.2.1 Urban reclaimed water source shall ensure its water quality as well as the stability, reliability and safety of water quantity.
5.2.2 It is strictly forbidden to use the sewage with over-proof heavy metal and toxic and harmful substance and sewage of medical institution as well as radioactive wastewater as the source of reclaimed water.
5.2.3 Reclaimed water quality shall meet the requirements of relevant current national standards. When there are different requirements for water quality, the user with large water consumption and low water quality standard shall be met at first.
5.3 Water Reclamation Safety Guarantee
5.3.1 Overflow and dump pipes shall be arranged for the urban reclaimed water engineering. When the overflow is discharged into the pipe or water body, it shall meet the requirements of national emission standard; during the dump, relevant emergency measures shall be taken.
5.3.2 For the urban reclaimed water use engineering, reclaimed water storage facility shall be arranged and sanitary protection shall be properly carried out to guarantee the quality safety of reclaimed water.
5.3.3 Disinfection facilities shall be arranged for the urban reclaimed water use engineering.
5.3.4 Facilities for measuring the water quality and monitoring the water quality shall be arranged for the urban reclaimed water use engineering.
5.3.5 When the drinking water serves as supplement of reclaimed water,
reliable and effective backflow and pollution prevention measures shall be 6 Structure
6.1 General Requirements
6.1.1 For the surface buildings of each plant in water supply and sewerage engineering of urban, their structure design and construction and quality acceptance shall meet corresponding provisions of national current standards of industrial and civil buildings.
6.1.2 For the major structure and underground main of main building in urban water supply and sewerage facility, their design service life of the structure shall not be less than 50 years and the safe class shall not be less than Grade II. 6.1.3 For the structure design of building and pipe in water supply and sewerage engineering of urban, the structure type, construction, foundation form and foundation treatment mode must be determined based on the
geotechnical investigation report.
6.1.4 The design, construction and management of building and pipe structure shall meet the following requirements:
1 The structure design shall be counted in the combined load, earthquake action (located in the earthquake region) and environmental influence (variation of temperature and humidity, surrounding medium effects, etc.), which may occur during no...

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