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In order to adapt to the prevailing rules of international technical regulations and technical standards, since 2016, the Ministry of Housing and Urban-Rural Development of the People's Republic of China has issued documents such as Opinions on Deepening the Reform of Engineering Construction Standardization Work, with an aim of proposing the long-term goal of the government to formulate mandatory standards and social groups to formulate voluntary standards, clarifying the reform task of gradually replacing the scattered mandatory provisions in the current standards with full-text mandatory engineering construction codes as well as gradually forming the "technical regulations" system consisting of laws, administrative regulations, technical provisions in departmental regulations and full-text mandatory engineering construction codes.
About the types of codes. A mandatory engineering construction code system covers all kinds of construction projects in the field of engineering construction, namely, engineering project codes (hereinafter referred to as "project codes") and general technical codes (hereinafter referred to as "general codes"). A project code takes the whole engineering construction project as the object, and includes five main elements: scale, layout, function, performance and key technical measures. A general code takes the general technology of each specialty to meet the functional performance requirements of engineering construction projects as the object, and covers main content of the general technical requirements such as survey, design, construction, repair and maintenance. The full-text mandatory engineering construction code system is formulated with project codes as the main parts and general codes to stipulate the common and general professional key technical measures for various projects.
About five major factor indicators. All elements in compulsory engineering construction codes can basically ensure the systematization and efficiency improvement of urban and rural infrastructure construction and fundamentally support the high-quality development of urban and rural construction. The project scale requirements mainly stipulate that a construction project shall have complete production or service capacity and can adapt to the level of economic and social development. The project layout requirements mainly stipulate the industrial layout, site selection of construction projects, overall design, general layout and overall technical requirements coordinated with the scale, and shall have rational distribution of supply capacity considered to improve the overall level of related facilities construction. The project functional requirements mainly stipulate the composition and use of the project, and clarify the basic components of the project, making it a guarantee for the project to play its expected role. The project performance requirements mainly stipulate the construction level or technical level of the construction project, reflect its applicability, and clarify the basic level that shall be achieved in terms of project quality, safety, energy saving, environmental protection, livable environment and sustainable development. The key technical measures are the basic technical regulations to realize the functions and performance requirements of the construction project, and can provide basic guarantee to implement the development goals of safety, green, resilience, wisdom, livability, fairness and efficiency in urban and rural construction.
About the implementation of codes. Mandatory engineering construction codes are empowered with mandatory binding force, which specify the control requirements and bottom lines for ensuring the safety of people's lives and property, personal health, engineering safety, ecological environment safety, public rights and interests, promoting energy and resource conservation as well as meeting economic and social management. These codes must be strictly implemented in the whole process of construction activities such as survey, design, construction, acceptance, repair, maintenance and demolition of engineering construction projects. For existing building renovation projects (where existing use functions remain unchanged), if conditions do not permit which makes it difficult to implement the existing standards, the stringency of the code implemented shall not be inferior to that implemented in original construction. The voluntary engineering construction standards matching the mandatory engineering construction codes are mature technical measures that have been tested by practice and can guarantee to meet the requirements of the mandatory codes, so they shall also be implemented under normal circumstances. On the premise of meeting the project function, performance requirements and key technical measures stipulated in the mandatory engineering construction codes, relevant association standards and enterprise standards may be reasonably selected to optimize the project function and performance or reach a higher level. Voluntary engineering construction standards, group standards and enterprise standards shall be coordinated and matched with mandatory engineering construction codes, and all technical requirements shall not be lower than the relevant technical levels of mandatory engineering construction codes.
After the implementation of mandatory engineering construction codes, the mandatory provisions in the current national standards and industry standards for engineering construction shall be abolished simultaneously. The mandatory provisions in the current local standards for engineering construction shall be revised in time and shall not be lower than those in the mandatory engineering construction codes. If the relevant provisions in current engineering construction standards (including mandatory and voluntary ones) are inconsistent with those in the mandatory engineering construction codes, the provisions of the latter shall prevail.
Project code for urban water supply engineering
1 General provisions
1.0.1 This code is developed to ensure the safety of urban water supply, standardize the construction and operation of urban water supply engineering, save resources as well as provide technical basis for government supervision.
1.0.2 This code must be implemented for urban centralized water supply projects.
1.0.3 Urban water supply engineering shall follow the principles of safe water supply, service guarantee, resource conservation, environmental protection and coordinated development with the natural circulation of water.
1.0.4 Whether the technical methods and measures adopted in the engineering construction meet the requirements of this code shall be judged by the relevant responsibility subjects. Innovative technical methods and measures shall be demonstrated to meet the performance requirements in this code.
2 Basic requirements
2.1 Scale and layout
2.1.1 Cities must build water supply engineering that meets the needs of their social and economic development. Urban water supply engineering shall be able to supply continuous water to meet the needs of users for water quality, quantity and pressure.
2.1.2 Urban water supply shall be coordinated with available water resources.
2.1.3 On the basis of scientific prediction of urban water consumption and water load, urban water supply planning shall reasonably develop and utilize water resources, coordinate the layout of water supply facilities, guide the construction of the water supply engineering, and be coordinated with water resources planning, water pollution prevention planning, ecological environment protection planning and disaster prevention planning, as well as be linked with special planning on such as urban drainage and sponge city.
2.2 Construction requirements
2.2.1 During the construction and operation of the urban water supply engineering, the requirements for production safety, occupational health and safety, fire safety, anti-terrorism and ecological safety must be met.
2.2.2 Urban water supply engineering shall be able to supply water in emergency such as natural disasters, accidents, public health incidents and social security incidents.
2.2.3 The seismic fortification of the main facilities of the urban water supply engineering shall be the key fortification category.
2.2.4 The flood control standard of the urban water supply engineering shall not be lower than the local fortification requirements.
2.2.5 For the main structure and water conveyance and distribution pipeline of the main structure in the urban water supply engineering, their structural design working lives shall not be less than 50 years, and their safety levels shall not be lower than Level II.
2.2.6 The equipment, materials and chemicals related to water in the urban water supply engineering must meet the health and safety requirements.
2.2.7 Water-saving and energy-saving technologies, equipment, appliances and products shall be preferentially adopted in the urban water supply engineering.
2.2.8 According to the corrosion properties and environmental conditions of the storage media or conveyance media, corresponding anti-corrosion measures shall be taken to protect structures, equipment and pipelines in the urban water supply engineering.
2.2.9 Noise, waste water, waste gas, dust and solid waste generated during the construction and operation of the urban water supply engineering shall not cause harm to the surrounding environment and personal health, and shall meet the requirements for ecological environment protection and control.
2.2.10 During the renovation and expansion of the urban water supply engineering, the safety of water supply shall be guaranteed, and adjacent facilities shall be protected.
2.2.11 The quality acceptance of the urban water supply engineering shall be carried out according to the acceptance items and procedures stipulated by the state.
2.2.12 The detention and retention facilities of drinking water shall be provided with hygienic protection measures to ensure water quality, and shall be cleaned and disinfected regularly.
2.2.13 The blow-down and overflow pipelines for detention and retention facilities of drinking water are strictly prohibited from being directly connected with the drainage pipelines and allowing sewage flow back and leak, and the drainage around them shall not be blocked.
2.2.14 The power supply system of the urban water supply engineering shall meet the requirements of continuous and safe operation of water supply facilities, and the electromechanical equipment and its systems shall meet the production capacity requirements in case of maintenance or failure.
2.2.15 The automatic control system and water supply dispatching system of the urban water supply engineering shall operate safely, reliably and continuously, and have the functions of real-time monitoring, data acquisition and processing, data storage, accident pre-warning, emergency disposal, etc.
2.2.16 The information system of the urban water supply engineering shall be an integral part of digital urban information system. The use and management of information security, cryptographic products and cryptographic technologies shall comply with relevant national regulations.
2.2.17 On-line monitoring instruments meeting process requirements shall be equipped for water source, water supply plant and station and pipeline network to ensure water supply safety. The instruments shall be verified and calibrated according to the regulations, and the records shall be kept.
2.2.18 Physical and electronic preventive measures shall be taken to water source, water supply plant and station and pipeline network to ensure the safety of water supply facilities.
2.2.19 In the urban water supply engineering, the power supply load class of water intake engineering, water treatment (distribution) engineering and water conveyance plant and station shall not be lower than the requirements in Table 2.2.19; standby power facilities shall be set up if the requirements in Table 2.2.19 cannot be met.
Table 2.2.19 Load class of power supply in water supply engineering
City size Permanent facility Temporary facility
Main plant and station Auxiliary plant and station
City in medium size and above Load class I Load class II Load class III
Small city Load class II Load class II Load class III
2.2.20 Measures shall be taken for the structures and electromechanical equipment of water supply facilities to prevent lightning strikes, and those for electronic and electrical equipment shall also be taken to eliminate the lightning electromagnetic pulses.
2.3 Operation and maintenance
2.3.1 Corresponding operation procedures shall be developed for the operation and maintenance of the urban water supply engineering and strictly implemented.
2.3.2 The full life cycle management shall be implemented for the urban water supply engineering, and files shall be established on the whole managing process.
2.3.3 The operation and maintenance of electrical facilities for urban water supply engineering shall comply with the safety regulations on electric utility operation to meet the safety requirements.
2.3.4 In terms of the urban water supply system, notification shall be made in advance if water supply needs to be stopped, and made in time in case of an emergency.
3 Water quality, quantity and pressure
3.1 Water quality
3.1.1 The quality of drinking water supplied to urban area must meet the relevant requirements of current national standard GB 5749 Standards for drinking water quality.
3.1.2 Water supply units must establish water quality pre-warning systems according to water quality risks, improve emergency water purification technologies and facilities, make emergency plans for water sources and water supply emergencies, and conduct regular emergency drills; effective measures shall be taken according to the emergency plan immediately after an emergency occurs.
3.1.3 Water quality inspection items and test frequency of centralized water supply shall meet the following requirements:
1 Items shall be determined for source water and inspected daily and monthly according to the actual situation of water sources.
2 Water quality inspection items and test frequency of finished water, pipeline network water and pipeline network tap water shall meet the requirements specified in Table 3.1.3.
Foreword iii
1 General provisions
2 Basic requirements
2.1 Scale and layout
2.2 Construction requirements
2.3 Operation and maintenance
3 Water quality, quantity and pressure
3.1 Water quality
3.2 Water amount
3.3 Water pressure
4 Water source and water intake engineering
5 Water supply plant
5.1 General
5.2 Plant area
5.3 Treatment process
5.4 Structures
5.5 Chemicals and apparatus
5.6 Ancillary facilities
6 Water supply pumping station
7 Water supply network
7.1 General requirements
7.2 Water conveyance and distribution
7.3 Ancillary facilities
