Code for Design of Building Water Supply and Drainage

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1 UDC NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CIDNA i:p~a~~"1~~;f{~/l p GB Code for Design of Building Water Supply and Drainage ( 2009 Edition) Issued on: April 15,2003 Implemented on: September 1,2003 Jointly Issued by Ministry of Housing and Urban-Rural Development and General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

2 Revision Note According to the requirements of Document Jian Biao ( 2007] No. 125 issued by former Ministry of Construction (MOC)-'"Notice on Printing the Development and Revision Plan of National Engineering Construction Standards in 2007 (The First Batch)", the code is by Shanghai Xian Dai Architectural Design (Group) Co., Ltd. jointly with relevant organizations, and revised from "Code for Design of Building Water Supply and Drainage" GB The partial revision of this Code is in accordance with the requirements of Document Jian Biao (1994] No. 219-" Notice on Printing the Administrative Measure for Partial Revision of Engineering Construction Standards", and its code partial revision also based on implementation situations in engineering construction after the publishing of the original code and the advice of the partial provision of the original code are massively solicited, as well as the work of testing technical parameters which are related to some provisions and product research, and is led to a final text through inspection by some departments concerned working together. The main contents of this partial revision are as follows : 1. Regulating the applicable conditions for the preventions of backflow pollution in the domestic drinking water pipe, supplementing the requirements for the preventions of backflow pollution of the locations and devices with high hazards of backflow pollution which is supplied by the pipe of drinking water and the combined pipe of living and producing, and supplementing the setting requirements for back flow preventers and vacuum breakers ; 2. Supplementing the principle specifications of such energy saving technologies as pressure-superposed water supply, solar hot water supply and heat pump hot water supply; 3. Improving the design flow calculation for residential sub-district; 4. Carrying out requirements for same-floor drain; 5. Recommending the new floor drain type with anti-drought function, and prohibiting the use of the bell jar ( bowl-buckle) type of floor drain; 6. Based upon the results of scientific tests, regulating the maximum desigri flow capacity for stacks under different setting conditions of the vent system. And supplementing design contents of the self-circulation vent system; 7. Setting up the design discharge capacity of rainwater leaders and roof drain ac- 1

3 cording to the design flow regime of rainwater system; 8. Revising design calculation parameters of hourly heat consumption for hot water supply; 9. Harmonizing supplementing design parameters for fine drinking water system. The provisions underlined in this Code are revised contents; the provisions printed in bold type are compulsory ones and must be enforced strictly. Ministry of Housing and Urban-Rural Development of the P eople's Republic of China is in charge of the administration of this Code and the explanation of the compulsory provisions, and the chief development organization is responsible for t he explanation of specific technical contents. All relevant organizations are kindly requested to s um up and accumulate your experiences in actual practices during the process of implementing this Code. The relevant opinions and advices can be posted or passed on to Shanghai Xian Dai Architectural Design (Group) Co., Ltd. Management Group of National Standard "Code for Design of Building Water Supply and Drainage". Address : No. 258, Shi Men Er Road, Shanghai; Zip Code: ; GB @163. com. Chief Development Organization of this partial revision: Shanghai Xian Dai Architectural Design (Group) Co., Ltd. Participating Development Organization of this partial revision: China Architecture Design &. Research G roup Chief Drafting Staff of this partial revision: Zhang Miao Liu Zhenyin Feng Xudong Xu Feng Inspecting Staff of this partial revision : Fang Ruqing Zhao Lijun Zhao Shiming Zhao Li Wang Guanjun Fang Yumei Cui Changqi Cheng Hongwei Wang Yan Wang Zengzhang Zheng Kebai Hua ng Xiaojia Zhang Qin Wang J ue Zhu Jianrong 2

4 Foreword According to the requirements of Document Jian Biao Cl 998) No. 94 issued by former Ministry of Construction (MOC)-"'Notice on Printing the Development and Revision Plan of National Engineering Construction Standards in 1998 (Batch I)", the "Code for the Design of Building Water Supply and Drainage" GBJ administered by Shanghai Construction and Management Committee, chief developed by Shanghai Xian Dai Architectural Design (Group) Co., Ltd. participating developed by China Architecture Design & Research Group and the Architectural Design and Research Institute of Guangdong P rovince has been revised completely. In the period of revision, the Code development organization :;ummarized the recent design experiences for building water supply and drainage, carried out various studies on major topics, proposed the draft for comments, based on the nationwide opinions which solicited by the Code development organization from specialists, scholars, designers of relevant design, research and college relevant organization, finally, the new version of Code was worked out through serious study and analysis. The main technical content revisions are as follows: CD The design of water supply and drainage for residential sub-districts has been The water consumption norm for residential and public buildings has been readjusted and The measures to prevent pollution in pipe connection have been New pipe application technologies has been Probability formula of calculating peak flow for residential building water supply has been H ydraulic calculation of varied types of pipe has been unified; (/) Recycled water treatment of recreational pools has been added ; The design for cooling tower and cooling water circulation has been added; Details of hospital sewage, water supply and drainage for swimming pool expressed in recommended standards have been deleted, whereas only provisions of principle, safet y and sanitation The provisions on water supply and drainage for production process have been deleted; The design parameter of pressure flow drainage of roof rainwater has been added; Applied range fo r design hourly heat consumption with central hot water supply system has been Calculation of natural circulation hot water pipe system has been deleted ; ~ Technologies essential and parameter of fuel oil (gas) hot water heater unit and water heater have been added and Relevant contents of fine drinking water pipe system have been added. The present Code may be in need of partial revision in the future, that the relevant 1

5 information and contents of partial revised Articles will be published on the magazine of "Standardization of Engineering Construction". The provisions printed in bold type are compulsory ones and must be enforced strictly. Ministry of Construction is in charge of the administration of this Code and the explanation of the compulsory provisions, Shanghai Construction and Management Committee in charge of the specific administration of this Code and Shanghai Xian Dai Architectural Design (Group) Co., Ltd. is responsible for the explanation of specific technical contents. All relevant organizations are kindly requested to sum up and accumulate yo ur experiences in actual practices during the process of implementing this code. The relevant opinions and advices, can be posted or passed on to Shanghai Xian Dai Architectural Design (Group) Co., Ltd. (Management Group of National Standard "Code for Design of Building Water Supply and Drainage", No. 258 Shi Men Er Lu Modem architectural design edifice, Shanghai, China, Postcode: ), for revision to the reference. Chief Development Organization, Participating Development Organization and Main Drafting Staffs of this Code: Chief Development Organization: Shanghai Xian Dai Architectural Design (Group) Co., Ltd. Participating Development Organization: China Architecture Design & Research Group Architectural Design and Research institute of G uangdong Province Main Drafting Staffs: Zhang Miao Liu Zhenyin He Guanqin F eng Xudong Sang Luqing 2

6 Contents 1 General Provisions 1 2 Terms and Symbols Terms Symbols ( 1 o) 3 Water Supply C 1 5) 3. 1 Water Consumption Norm and Water Pressure... C 1 5) 3. 2 Water Quality and Contamination Prevention ( 2 O) 3. 3 System Selection C 2 3) 3. 4 Pipe Materials, Appurtenances and Water Meters C 2 5) 3. 5 Piping Layout and Installation ( 3 O) 3. 6 Design Flow and Hydraulic Calculation of Piping C 3 3) 3.7 WaterTowersandWaterTanks... ( 40) 3. 8 Pressure Boosting Equipment, Pump Stations C 4 3) 3. 9 Swimming Pools and Recreational Pools..... C 4 6) Cooling Water Circulation and Cooling Towers C 5 1) 3.11 Waterscape... (55) 4 Waste Drainage C 5 7) 4. 1 Selection of Drainage Systems C 5 7) 4. 2 Plumbing Fixtures and Traps C 5 7) 4. 3 Piping Layout and Installation C 5 9) 4. 4 H ydraulic Calculation of Drainage Piping C 64) 4. 5 Pipe Materials, Appurtenances and Inspection Chamber C 6 8) 4. 6 Vent Pipes (72) 4. 7 Sewage Pumps and Sump ( 7 5) 4.8 Small Sanitary Waste Treatment... (77) 4. 9 Storm Drainage C 8 2) 5 Hot Water and Drinking Water Supply C 8 9) 5. 1 Consumption Norm, Temperature and Quality of Hot Water ( 8 9) 5. 2 Selection of Hot Water Supply Systems C 9 4) 5. 3 Calculation of Heat Consumption, Hot Water Demand and Supply Capability of Heating Equipment C 9 7) 5. 4 Water H eating and Storage ClOO) 1

7 5. 5 System Calculation 013) 5. 6 Pipe Piping Materials, Appurtenances and Piping Layout (115) 5. 7 Drinking Water Supply... ( 117) Appendix A Hazard Degree of Backflow Pollution & Selection of Backflow Appendix B Appendix C Preventing Facilities (12 1) Residential Sub-district Underground Pipeline (Structure) Minimum Clearance Between Lines ) ac For Formula Calculating the Plumbing Fixture Simultaneous Outflow Probability in Piping ) Appendix D Equivalent Length for Fr iction Loss in Valves and Threaded Fittings ( 125 ) Appendix E Design Peak Flow Calculation Table for Water Supply Piping 026) Appendix F Calculation for the Number of Simultaneous Using Drinking Water Faucets... ( 136) Explanation of Wording in This Code ( 138) List of Standards Quoted in This Code ) 2

8 1 General Provisions This Code is formulated with a view to ensure the quality of the design of building water supply and drainage, and make the design be in accordance with basic requirements of safety, health, usability and economy. 1. O. 2 This Code is applicable to the design of water supply and drainage systems for residential sub-districts, public buildings, and civil buildings; it is also applicable to the design of domestic water supply, sanitary waste drain as well as roof rainwater drainage systems for industrial buildings. H owever, when designing the following projects, the current applicable codes and regulations shall be complied: 1 Buildings in regions with collapsible loess, perennial frozen soil and expansive soil; 2 Buildings with the seismic intensity of more than 9 in scale ; 3 Mineral spas hydrotherapy and civil air defense shelters; 4 Industrial water supply and drainage; 5 Building reclaimed water and rainwater utilization. 1. o. 3 The design of building water supply and drainage shall not only satisfy the requirement of use, but also offer accessible conditions for construction installation, operation, maintenance inspection and safety protection Building water supply and drainage engineering design, not only the requirements stipulated in this Code, but also those in the current relevant ones of the nation shall be complied with. 1

9 2 Terms and Symbols 2. 1 Terms Drinking water Water, that its quality meets health standards for drinking and washing Non-drinking water Water not for drinking, and usually referred to that for flushing toilets, vehicles washing, road sprinkling, greenbelt irrigation, and air-conditioner makeup water, etc H ourly variation coefficient Ratio of the maximum hourly water consumption to average hourly water consumption on t he maximum consumption day Maximum hourly water consumption The maximum hourly water consumption on the maximum consumption day A Average hourly water consumption The average hourly water consumption in rush hours on the maximum consumption day S Backflow pollution Pollution in domestic water supply system resulted due to backflow of siphonage or negative pressure SA Back-pressure backflow It is a phenomenon that pr essured non-drinking water or other liquids, mixtures enter the drinking water supply system, which is caused due to the loss of pressure in the water supply pipeline of downstream SB Siphonage backflow T he phenomenon that water or liquid mixture flows back from the plumbing fixture or receptacle enters water supply system due to negative pressure in the upstream of the water supply piping A ir gap In water supply system, the spatial vertical distance of the lowest the outlet between any pipe or the faucet and the overflow level of the receptacle or fixture; in drainage system, vertical distance between the outlet of the indirect drainage device or the container and the overflow level rim of the receptacle into which the waste pipe is discharging F lood-level nm 2

10 2 Terms and Symbols 2. 1 Terms Drinking water Water, that its quality meets health standards fo r drinking and washing Non-drinking water Water not for drinking, and usually referred to that for flushing toilets, vehicles washing, road sprinkling, greenbelt irrigation, and air-conditioner makeup water, etc H ourly var iation coefficient Ratio of the maximum hourly water consumption to average hourly water consumption on the maximum consumption day Maximum hourly water consumption The maximum hourly water consumption on the maximum consumption day A Average hourly water consumption The average hourly water consumption in rush hours on the maximum consumption day S Backflow pollution Pollution in domestic water supply system resulted due to backflow of siphonage or negative pressure SA Back-pressure backflow It is a phenomenon that pressured non-drinking water or other liquids, mixtures enter the drinking water supply system, which is caused due to the loss of pressure in the water supply pipeline of downstream SB Siphonage backflow The phenomenon that water or liquid mixture flows back from the plumbing fixture or receptacle enters water supply system due to negative pressure in the upstream of the water s upply piping Air gap In water supply system, the spatial vertical distance of the lowest the outlet between any pipe or the faucet and the overflow level of the receptacle or fixture ; in drainage system, vertical distance between the outlet of the indirect drainage device or the container and the overflow level rim of the receptacle into which the waste pipe is discharging Flood-level rim 2

CROSS-CONNECTION CONTROL PROGRAM HARVEST-MONROVIA WATER, SEWER AND FIRE PROTECTION AUTHORITY

CROSS-CONNECTION CONTROL PROGRAM HARVEST-MONROVIA WATER, SEWER AND FIRE PROTECTION AUTHORITY Adopted February 8, 1988 Revised September 19, 1995 Revised February 8, 2005 Approved Witness TABLE OF CONTENTS