GB 55020-2021 English PDFUS$1959.00 · In stock
Delivery: <= 10 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 55020-2021: Code for design of building water supply and drainage Status: Valid
Basic dataStandard ID: GB 55020-2021 (GB55020-2021)Description (Translated English): Code for design of building water supply and drainage Sector / Industry: National Standard Classification of Chinese Standard: P40 Word Count Estimation: 97,915 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation GB 55020-2021: Code for design of building water supply and drainage---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 In order to protect personal health, life and property safety, water resources and ecological environment safety, and meet the basic needs of economic and social management in the construction of building water supply and drainage and water-saving projects, this specification is formulated in accordance with relevant laws and regulations. 1.0.2 The design, construction, acceptance, operation and maintenance of building water supply and drainage and water saving projects must comply with this specification. 1.0.3 Whether the technical methods and measures adopted in the project meet the requirements of this specification shall be judged by the relevant responsible parties. Among them, innovative technical methods and measures should be demonstrated and meet the performance requirements in this specification. 2 basic rules 2.0.1 Building water supply and drainage and water-saving projects should have the ability to deal with emergencies such as natural disasters, accidents, public health incidents and social security incidents, and the facility operation management unit should formulate relevant emergency plans. 2.0.2 The flood control and flood prevention standards of building water supply and drainage and water saving projects should not be lower than the corresponding requirements for urban fortification in the area. 2.0.3 Materials, products and equipment selected for building water supply and drainage and water-saving projects must be of qualified quality, and materials and equipment related to domestic water supply must also meet the requirements of hygiene and safety. 2.0.4 The processes, equipment, appliances and products selected for building water supply and drainage and water-saving projects should be water-saving and energy-saving. 2.0.5 The construction of production safety, environmental protection and water-saving facilities in building water supply and drainage and water-saving projects should be designed, constructed and put into use at the same time as the main project. 2.0.6 The operation, maintenance and management of building water supply and drainage and water-saving projects should formulate corresponding operating standards and strictly implement them. 2.0.7 The noise, waste water, waste gas and solid waste generated during the construction and operation of building water supply and drainage and water saving projects shall not cause harm to the building environment and human health. 2.0.8 The flammable, explosive and toxic chemical hazards used and produced during the operation of building water supply and drainage facilities shall be strictly managed to prevent personal injury and catastrophic accidents. 2.0.9 Protective measures that do not affect public safety shall be taken for water supply and drainage pipes, equipment and structures in public places. 2.0.10 Equipment and pipelines should be convenient for installation, commissioning, inspection and maintenance. 2.0.11 The anti-corrosion and anti-freezing measures should be determined for pipelines, equipment and structures according to the corrosive nature and environmental conditions of their storage or transmission medium. 2.0.12 For the underground water supply and drainage pipelines arranged within the protection distance in the collapsible loess area, corresponding protective measures shall be taken according to the collapsibility level. 2.0.13 The manhole covers of outdoor inspection wells should have anti-theft and anti-fall measures, and the manhole covers of inspection wells and valve wells should have attribute marks. Manhole covers and well seats with sufficient bearing capacity and good stability should be used for inspection wells and valve wells located on the roadway. 2.0.14 Protective airtight measures shall be taken for the water supply and drainage pipes passing through the enclosure structure of the civil air defense basement. 2.0.15 The raw water quality of domestic hot water, swimming pools and public hot water massage pools shall comply with the relevant provisions of the current national standard "Drinking Water Sanitation Standard" GB 5749. 3 water supply system design3.1 General provisions 3.1.1 The water supply system should have the ability to guarantee uninterrupted water supply to buildings or communities, and the water quality, water flow and water pressure should meet the normal water demand of users. 3.1.2 The quality of drinking water shall comply with the current national standard "Drinking Water Hygienic Standard" GB 5749. 3.1.3 The secondary pressurization and regulation and storage facilities shall not affect the normal water supply of the urban water supply network. 3.1.4 It is strictly forbidden to directly connect the water supply pipelines of self-built water supply facilities with urban water supply pipelines. Domestic drinking water pipelines are strictly prohibited from being connected to non-drinking water pipelines such as building reclaimed water and reused water. 3.1.5 The drinking water supply system shall not be polluted by backflow from pipelines and facilities. Reliable anti-backflow measures shall be taken according to the nature of backflow and the degree of harm caused by backflow pollution. 3.2 Water supply network 3.2.1 The water supply system should make full use of the pressure of the outdoor pipe network to directly supply water. The system water supply mode and water supply partition should be reasonably determined according to factors such as building use, building height, use requirements, material and equipment performance, maintenance management, and operating energy consumption. 3.2.2 The working pressure of the pipes, fittings and connection methods used in the water supply system shall not be greater than the nominal pressure or the nominal allowable working pressure in the current national standards; the nominal pressure of the valves shall not be less than the nominal pressure of the pipes and fittings. 3.2.3 The main pipes of the outdoor water supply network should be arranged in a ring. 3.2.4 The outdoor buried water supply pipeline shall not affect the foundation of the building, and the distance and location from the building, other pipelines and structures shall ensure the safety of water supply. 3.2.5 It is strictly forbidden for the water supply pipeline to pass through the toxic pollution area. Water supply pipes passing through corrosion areas should take safety protection measures. 3.2.6 The layout of domestic and drinking water pipelines in buildings shall meet the following requirements. 1 It should not be arranged on the raw materials, products and equipment that may cause combustion or explosion when contacted with water; 2 The layout of the pipeline shall not be polluted, and shall not affect the structural safety and normal use of the building. 3.2.7 The distribution of drinking water pipelines to sanitary appliances and water equipment shall meet the following requirements. 1 The water outlet of the water distribution parts shall not be submerged by any liquid or impurities; 2 The minimum air gap between the water outlet of the water distribution part and the overflow edge of the receiving water container shall not be less than 2.5 times the diameter of the water outlet; 3 Drainage pipes shall not be arranged above the drinking water pool (tank). 4 Drinking water pools (tanks) and manholes of water towers should be sealed and equipped with locks, and ventilation pipes and overflow pipes should have measures to prevent organisms from entering the pool (tank). 5 The drinking water pool (tank) and water tower should be equipped with disinfection facilities. 3.3.2 The water pump unit of the domestic water supply system shall be equipped with a pump, and the water supply capacity of the standby pump shall not be less than the water supply capacity of the largest running water pump. 3.3.3 Measures should be taken to eliminate water hammer hazards for pipelines in the water pump room where water hammer may occur. 3.3.4 The water tank room and water supply pump room with water storage or pressurization facilities should meet the requirements for equipment installation, operation, maintenance and overhaul, and should have reliable flood prevention and drainage facilities. 3.3.5 The drinking water tank room and the water supply pump room should be equipped with technical and physical defense safety precautions and monitoring measures such as intrusion alarm system. 3.3.6 Water pressurization, circulating cooling and other equipment shall not be installed on the upper and lower floors of bedrooms, guest rooms and wards or adjacent to the above-mentioned rooms, and shall not affect the living environment. 3.4 Water saving measures 3.4.1 Water supply and water use shall be based on the purpose of use, payment or management unit, sub-item and graded installation of metering devices that meet the needs of use and have passed the metering verification. 3.4.2 The water supply system should use corrosion-resistant and durable pipes, fittings and valves to reduce the surge loss of the pipeline system. 3.4.3 Municipal tap water and underground well water shall not be used as water sources for non-hydrophilic outdoor landscape water bodies. 3.4.4 The water distribution branch pipe with water pressure greater than 0.2MPa at the water point shall take decompression measures and shall meet the working pressure requirements of water appliances. 3.4.5 The faucets of washbasins in public places should adopt non-contact or time-delayed self-closing faucets. 3.4.6 Domestic water supply pools (tanks) should be equipped with water level control and overflow alarm devices. 3.4.7 Centralized air-conditioning cooling water, swimming pool water, car washing water in car washes, and water source heat pump water should be recycled. 3.4.8 High-efficiency water-saving irrigation methods should be adopted for greening and sprinkling.4 Drainage System Design4.1 General provisions 4.1.1 The materials of drainage pipes and pipe fittings shall be corrosion-resistant, and shall have the temperature resistance ability to withstand the drainage temperature not lower than 40°C and continuous drainage. The interface installation connection should be reliable and safe. 4.1.2 Domestic drainage should be discharged into the municipal sewage pipe network or discharged up to standard after treatment. 4.1.3 Drainage pipes and overflow pipes of domestic drinking water tanks (pools), reclaimed water tanks (pools), and rainwater clear water tanks shall adopt indirect drainage, and direct connection with sewage pipes is strictly prohibited. 4.2 Sanitary ware and water seal 4.2.1 When the sanitary appliances without water traps in the structure, non-water-sealed floor drains, equipment or drain outlets are connected to domestic drainage pipes, water traps must be installed below the drain outlets. 4.2.2 The water seal depth of the water seal device shall not be less than 50mm, and the water seal shall not be set repeatedly on the drainage pipe section of the sanitary ware. 4.2.3 It is strictly forbidden to use bell-type structure floor drains and use movable mechanical valves instead of water seals. 4.2.4 A water sealing device shall be installed at the connection between the indoor domestic sewage drain and the outdoor domestic sewage pipe. 4.3 Domestic drainage pipes 4.3.1 Separate drainage systems shall be provided for the drainage of the following buildings. 1 Grease-containing waste water from kitchens in staff canteens and restaurants; 2 Sewage and wastewater from medical and scientific research institutions that contain pathogenic bacteria and radioactive elements that exceed the discharge standards; 3 Laboratory toxic and harmful wastewater; 4 Drainage of emergency epidemic prevention isolation areas and medical care stations. 4.3.2 The indoor domestic drainage system shall not emit harmful gases such as turbidity or odor into the room. 4.3.3 The domestic drainage system should have sufficient drainage capacity, and should quickly and timely remove the sewage and waste water from various sanitary appliances and floor drains. 4.3.4 Ventilation pipes must not accept sewage and waste water from appliances, and must not be connected to air ducts and flues. 4.3.5 Ground drainage facilities should be installed in the parts with showers and washing machines. 4.3.6 Drainage pipes shall not pass through the following places. 1 bedroom, guest room, ward and dormitory, etc.; 2 Above the living and drinking water pool (tank); 3 above the main and non-staple food operations, cooking, meal preparation, and main and non-staple food warehouses in canteen kitchens and catering kitchens; 4 Above the raw materials, products and equipment that will cause combustion and explosion when contact with water. 4.3.7 Sanitary appliances and ground wells in the basement and semi-basement shall not be connected to the upper drainage pipes, and the pressure flow drainage system shall be adopted, and the safe and reliable discharge of sewage and waste water shall be ensured. 4.4 Domestic drainage equipment and structures 4.4.1 When the indoor ground of the building is lower than the outdoor ground, drainage sumps, drainage pumps or finished drainage lifting devices should be installed to remove domestic drainage, and the safe and reliable discharge of sewage and wastewater should be ensured. 4.4.2 When the domestic sewage collection pool is set in the indoor basement, the pool cover should be sealed and a ventilation pipe should be provided. 4.4.3 The septic tank should be equipped with a ventilation pipe, and the location of the outlet of the ventilation pipe should meet the requirements of safety and environmental protection. 4.4.4 The drainage pipes and domestic drainage piping systems of the following structures and equipment shall adopt the indirect drainage method. 1 The drain pipe and overflow pipe of the drinking water storage tank (pool); 2 Boiler, water heater drainage; 3 Drainage of non-infectious disease medical sterilization and disinfection equipment; 4 The drainage of infectious disease medical disinfection equipment should be collected and treated separately; 5 Drainage of condensed water from evaporative coolers and air-conditioning equipment; 6 The ground drainage of the refrigerated warehouse for storing food or beverages and the drainage of the frost-melting water tray of the air cooler. 4.4.5 Domestic drainage pumps should be equipped with spare pumps, and anti-backflow measures should be taken on the outlet pipes of each pump. 4.4.6 Grease-containing waste water from public catering kitchens should be drained to oil separation facilities separately, and ventilation pipes should be installed in indoor oil separation facilities. 4.4.7 The net distance between the septic tank and the underground water intake structure shall not be less than 30m. 4.5 Rainwater system 4.5.1 Roof rainwater should be discharged in an organized manner. 4.5.2 The installation and drainage capacity of roof rainwater drainage and overflow facilities shall not affect the roof structure, walls and personnel safety, and shall comply with the following regulations. 1 The roof rainwater drainage system shall ensure timely removal of the maximum amount of rainwater in the design return period, and the overflow facilities shall be able to operate safely and reliably when the rainwater condition exceeds the design return period; 2 The design return period of the roof water drainage system should be determined according to the importance of the building, system requirements and the severity of property loss or building damage that may be caused by flooding. 4.5.3 The roof rainwater collection or drainage system should be set independently, and it is strictly forbidden to connect with the building's domestic sewage and waste water drainage. It is strictly forbidden to set up open inspection ports or inspection wells indoors in civil buildings. 4.5.4 The balcony surface water should not share the drainage riser with the roof rainwater. When the balcony towel water and the balcony domestic drainage facilities share the drainage riser, it shall not be discharged into the outdoor rainwater pipe. 4.5.5 Waterproof measures should be taken at the connection between the rainwater bucket and the gutter and eaves. 4.5.6 The pipes, accessories and connection interfaces of the roof rainwater drainage system shall be able to withstand the positive pressure generated by the roof irrigation height. For roof rainwater systems with bucket elevations higher than 250m, the pressure bearing capacity of pipes, accessories and connection interfaces should not be less than 2.5MPa. 4.5.7 When the roof rainwater pipe of a building with a building height exceeding 100m is connected to an outdoor inspection well, the wall of the inspection well shall have sufficient strength to withstand rainwater erosion, and the well cover shall be able to overflow rainwater. 4.5.8 For the siphon type rainwater bucket roof rainwater system, the 87 type rainwater bucket roof water system and the roof rainwater system with excessive rainwater inflow, the pipes, accessories and connection interfaces should be able to withstand the negative pressure generated by the system during operation. 4.5.9 Plastic rainwater drainage pipes shall not be arranged in the high-temperature working area of industrial plants. 4.5.10 The outdoor rainwater outlet shall be set at the end of the rainwater control and utilization facilities, and shall be discharged in the form of overflow; the overflow of rainfall exceeding the rainwater runoff control requirements shall be discharged into the municipal rainwater pipe. 4.5.11 Buildings and communities should follow the principle of reducing emissions at the source, construct rainwater control and utilization facilities, and reduce the impact on the water ecological environment. The control of the total annual runoff of rainfall and the peak value of effluent runoff shall meet the following requirements. 1 Newly built buildings and communities should reach the level before construction and development; 2 The reconstructed buildings and communities shall meet the special planning requirements for local sponge city construction. 4.5.12 Sites larger than 10hm2 should be specially designed for rainwater control and utilization. Rainwater control and utilization should adopt soil infiltration system, collection and reuse system, regulation and storage discharge system. 4.5.13 Under the condition of perennial decline, the runoff from roof and hardened ground shall be controlled and utilized. 4.5.14 The construction of rainwater control and utilization facilities should make full use of natural lakes, ponds, swamps, wetlands and other natural water bodies in the surrounding area. 4.5.15 Rainwater infiltration should not cause geological disasters and damage buildings and road foundations. Rainwater infiltration systems shall not be used in the following places. 1 Places that may cause collapse and landslide disasters; 2 Places that cause harm to the living environment and the natural environment; 3 Special soil geological sites such as self-weight collapsible loess, expansive soil, high saline soil and clay. 4.5.16 For the rainwater discharge on the sunken ground, sunken square, sunken courtyard and underground garage entrance and exit ramps connecting the buildin......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 55020-2021_English be delivered?Answer: Upon your order, we will start to translate GB 55020-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 10 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 55020-2021_English with my colleagues?Answer: Yes. 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