GB 50015-2019 Standard for Design of Building Water Supply and Drainage

General Provisions

• 第 1.0.3 条Building water supply and drainage design shall meet the requirements of safety, sanitation, energy efficienc…
• 第 1.0.4 条Parameters such as water consumption quotas, water pressure, water quality, and water quantity adopted in the…
• 第 1.0.5 条Building water supply and drainage systems should be equipped with reasonably arranged metering devices; for …
• 第 1.0.6 条Building water supply and drainage design should use efficient, low noise, energy saving equipment and piping…
• 第 1.0.7 条Building water supply and drainage systems shall be provided with measures to prevent water quality contamina…
• 第 1.0.8 条The building water supply and drainage design should reasonably determine the system scheme based on building…
• 第 1.0.1 条To ensure the quality of building water supply and drainage engineering design and to meet the requirements f…
• 第 1.0.3 条Building water supply and drainage design shall comply with the Standards for Drinking Water Quality (GB 5749…
• 第 1.0.4 条Water saving sanitary fixtures and fittings should be reasonably selected in the design; water use points suc…
• 第 1.0.5 条Building water supply and drainage systems shall be equipped with metering devices, and hotels shall install …
• 第 1.0.6 条The design should make full use of the pressure of the municipal water supply network. The hotel water supply…
• 第 1.0.7 条The drainage system shall ensure unobstructed and safe flow. Oily wastewater from the hotel kitchen shall be …
• 第 1.0.8 条The hot water supply system shall ensure stable water temperature and energy efficiency. The hot water temper…
• 第 1.0.9 条Building water supply and drainage design shall meet fire protection requirements; hotels shall provide fire …

Terminology

• 第 2.1.3 条Domestic water supply system: Backflow prevention measures shall be adopted; a backflow preventer shall be in…
• 第 2.1.6 条Drainage system: inspection openings shall be provided at the connection between the bottom of the domestic d…
• 第 2.1.9 条Hot water system: hot water supply temperature 55–60℃, return water temperature ≥50℃; for hotel buildings, th…
• 第 2.1.12 条Rainwater system: design return period P=10 years (general buildings), hotel building roof rainwater drainage…
• 第 2.1.15 条Water saving fixtures: the water efficiency grade of sanitary fixtures shall be no lower than Grade 2; for ho…
• 第 2.1.18 条Pipe layout: The clear distance between parallel water supply and drainage pipes shall be ≥0.5m, and the clea…
• 第 2.0.1 条Domestic water supply system: refers to the water supply system providing domestic water for residential buil…
• 第 2.0.2 条Water use quota: In hotel buildings, the guest room water use quota is 250–400 L/(bed·d), the staff water use…
• 第 2.0.3 条Design peak flow: The design peak flow of water supply pipes in hotel buildings shall be calculated according…
• 第 2.0.4 条Hot water supply temperature: For the hotel's central hot water supply system, the hot water supply temperatu…
• 第 2.0.5 条Drainage system: The drainage system of hotel buildings shall adopt a separate system, with domestic sewage a…
• 第 2.0.6 条Rainwater system: For hotel building roofs, the design return period for rainwater should preferably be 10 ye…
• 第 2.0.7 条Greywater system: If a greywater system is provided in the hotel building, high quality greywater (such as ba…
• 第 2.0.8 条Fire water supply system: Hotel buildings should be equipped with an indoor hydrant system. The hydrant water…

Water supply

• 第 3.1.3 条The domestic water supply system should make full use of the pressure of the municipal water supply network f…
• 第 3.3.2 条The hydrostatic pressure at the lowest sanitary fixture outlet in each zone of the domestic water supply syst…
• 第 3.4.3 条In hotel buildings, the water supply pressure at water points such as showerheads and washbasins in guest bat…
• 第 3.5.3 条Water flow velocity in water supply pipes: when nominal diameter DN≤25mm, it should not exceed 1.0m/s; for DN…
• 第 3.6.1 条Domestic water supply system water quota: The maximum daily water quota for hotel guest rooms is 250–400 L/be…
• 第 3.7.2 条In hotel buildings, a backflow preventer shall be installed on the water supply service pipe and shall be loc…
• 第 3.2.1 条The hotel domestic water supply system should make full use of the municipal water supply network pressure; w…
• 第 3.2.2 条At water supply points such as showerheads and washbasins in hotel guest bathroom, the water supply pressure …
• 第 3.2.3 条The hotel building's water supply service pipe shall be equipped with a backflow preventer, which shall be in…
• 第 3.2.4 条Hotel domestic water supply pipe flow velocity: for DN15–DN20, the flow velocity should not exceed 1.0 m/s; f…
• 第 3.2.5 条The diameter of the water supply branch pipe for the hotel guest room bathroom shall not be less than DN15, a…
• 第 3.2.6 条Water supply pipes in hotel buildings shall not be laid in rooms such as transformer and distribution rooms, …
• 第 3.2.7 条The hotel water supply system should be equipped with metering devices: each guest room should have a separat…
• 第 3.2.8 条The hotel domestic water supply system should be equipped with disinfection facilities. When ultraviolet disi…
• 第 3.2.9 条The hotel water supply system shall be provided with measures to prevent backflow contamination: when the wat…
• 第 3.2.10 条The design peak flow of the hotel water supply system shall be calculated based on the number of plumbing fix…

Drainage

• 第 3.2.1 条Drainage pipes must not pass through bedrooms, guest rooms, patient rooms, or other rooms with high requireme…
• 第 4.3.1 条At the connection between the bottom of a vertical soil/waste pipe and the horizontal pipe, an elbow or a lar…
• 第 4.4.2 条In hotel buildings, the slope of horizontal drainage pipes shall be set according to the standard slopes: 0.0…
• 第 4.6.1 条Maximum design drainage capacity of drainage stacks: DN100 is 4.5 L/s (vented through roof), DN150 is 8.0 L/s…
• 第 4.8.1 条In hotel buildings, kitchen oil containing wastewater must undergo grease separation before being discharged …
• 第 4.9.1 条Drainage pipe inspection opening spacing: one on each vertical stack every 6 floors (mandatory at the bottom …
• 第 4.4.5 条The design peak drainage flow of the drainage stack in hotel guest room bathrooms (when a dedicated vent stac…
• 第 4.4.6 条Standard slope for drainage horizontal branch pipes in hotel public restrooms (e.g., lobby, restaurant): DN50…
• 第 4.5.1 条Oil containing wastewater from hotel kitchens shall be drained via a separate system and provided with a grea…
• 第 4.6.2 条In hotel buildings, a support pier or fixing measure shall be provided at the connection (bend) between the b…
• 第 4.6.7 条Hotel guestroom bathroom drainage stacks shall be provided with a dedicated vent stack (when the total design…
• 第 4.7.3 条Hotel laundry drainage (containing detergents, lint, etc.) shall be provided with a hair interceptor or sedim…
• 第 4.8.1 条The effective volume of the drainage sump in the hotel basement (e.g., equipment floor, underground garage) s…
• 第 4.9.2 条Design drainage capacity of roof rainwater outlets for hotel roof drainage (e.g., podium roof garden, main to…

Hot water

• 第 6.2.1 条The hot water consumption quota shall be determined according to the building use and the standard of sanitar…
• 第 6.3.1 条The hot water supply system shall be provided with circulation piping to ensure that the outlet water tempera…
• 第 6.3.5 条The hot water system should be equipped with a temperature control device, and the outlet water temperature s…
• 第 6.4.1 条The outlet water temperature of the hot water heater should be 60 65℃, and the storage water temperature shou…
• 第 6.5.2 条Hot water pipes should be insulated, with the insulation thickness determined by heat loss calculation; the e…
• 第 6.6.3 条The hot water system shall be provided with a safety valve or pressure relief device, and the working pressur…
• 第 6.2.1 条Hotel guest room hot water demand quota: calculated by bed, the maximum daily water quota is 120–160 L/bed·d …
• 第 6.2.4 条Calculation of design hourly heat consumption for hotel hot water: the "design hourly hot water volume" metho…
• 第 6.3.1 条Hot water supply system selection: The hotel should adopt a 24 hour central hot water supply system; when the…
• 第 6.3.5 条Hot water circulation flow rate: The hotel building's hot water supply system shall be provided with mechanic…
• 第 6.4.1 条Heating equipment outlet water temperature: For a hotel central hot water supply system, the outlet water tem…
• 第 6.4.3 条Hot water storage volume: The effective heat storage capacity of a water heater or hot water storage tank in …
• 第 6.5.2 条Hot water pipe flow velocity: For hotel hot water main pipes, the flow velocity should not exceed 1.5 m/s; fo…
• 第 6.6.1 条Hot water quality treatment: When the total hardness of raw water (as CaCO₃) in the hotel hot water system is…
• 第 6.7.2 条Safety valve setting: Water heaters in hotels shall be equipped with safety valves; the opening pressure shal…
• 第 6.8.3 条Hot water metering: Guest room hot water in hotels shall be metered per room; the meter size shall be selecte…

Rainwater

• 第 5.2.1 条Design storm return period for roof rainwater: 10 years for general buildings, 50 years for important public …
• 第 5.2.4 条Maximum discharge capacity of roof drain: 87 type roof drain (DN100) is 16 L/s, siphon type roof drain (DN100…
• 第 5.2.10 条Design flow regime for rainwater pipes: the gravity flow system shall be calculated as full pipe pressure flo…
• 第 5.3.3 条Rainwater reuse system: the annual runoff total volume control rate shall not be less than 55%, and the effec…
• 第 5.4.2 条Special provisions for hotel buildings: The roof rainwater drainage system shall be provided with independent…
• 第 5.4.5 条Rainwater overflow facilities: Hotel building roofs should be provided with overflow outlets or overflow pipe…
• 第 5.2.1 条Building roof rainwater drainage systems shall be provided with overflow facilities, and the total drainage c…
• 第 5.2.4 条For roof rainwater drainage systems in high rise buildings (including hotels), the connection of roof drains …
• 第 5.2.10 条Design recurrence interval for building roof rainwater drainage systems: 5 years for general building roofs, …
• 第 5.2.11 条The design rainfall duration for the roof rainwater drainage system is calculated as 5 minutes, and the desig…
• 第 5.2.13 条Maximum discharge capacity of roof rainwater outlets: 87 type rainwater outlet (DN100) is 12 L/s, DN150 is 26…
• 第 5.2.16 条Maximum design drainage flow of rainwater downpipe: DN100 is 19 L/s, DN150 is 38 L/s, DN200 is 75 L/s (based …
• 第 5.2.19 条Minimum slope of building rainwater drainage pipes: 0.005 for suspended pipes and 0.003 for buried pipes; the…
• 第 5.2.25 条Balcony rainwater shall be provided with a separate drainage system and shall not be combined with the roof r…
• 第 5.2.28 条Rainwater from the podium roof of the hotel building shall be discharged separately and shall not be combined…
• 第 5.2.30 条Maximum spacing of stormwater inspection chambers: 30 m for pipe diameters DN200–DN300, 40 m for DN400–DN500;…
• 第 5.2.33 条The effective volume of the rainwater collection tank for the rainwater reuse system (e.g., hotel greening an…

Swimming pool

• 第 3.9.1 条The circulating water of the swimming pool should undergo filtration and disinfection treatment; the circulat…
• 第 3.9.3 条A swimming pool shall be provided with a pool water circulation and purification treatment system; the circul…
• 第 3.9.5 条The swimming pool shall be provided with water quality monitoring and automatic dosing equipment; the residua…
• 第 3.9.7 条A swimming pool shall be provided with a balance tank or equalizing tank, whose effective volume shall not be…
• 第 3.9.9 条Swimming pools in hotel buildings shall be provided with independent water supply and drainage systems, shall…
• 第 3.9.11 条The swimming pool drainage pipe should be provided with indirect drainage, and the drain outlet should be fit…
• 第 4.9.1 条For swimming pools in public buildings such as hotels, the circulation period should preferably be 4–6 h, and…
• 第 4.9.2 条Swimming pools shall use a recirculating filtration water supply system; filter velocities: quartz sand filte…
• 第 4.9.3 条The pool water temperature should be 26–28℃, and the outlet water temperature of the heating equipment for in…
• 第 4.9.4 条Swimming pools shall be equipped with disinfection devices, preferably chlorine or ozone disinfection. Residu…
• 第 4.9.5 条Pool makeup water volume: For indoor swimming pools, the daily makeup water volume is 5%–10% of the pool wate…
• 第 4.9.6 条The swimming pool shall be provided with a balance tank or equalizing tank, with the effective volume calcula…
• 第 4.9.7 条The swimming pool drainage system should be provided with a drain outlet; the drain down time should not exce…
• 第 4.9.8 条Hotel swimming pools shall be equipped with water quality monitoring devices; pH shall be controlled within 6…
• 第 4.9.9 条Pool inlets, outlets and drain outlets shall be fitted with grilles with a gap ≤10mm, and the return outlet f…
• 第 4.9.10 条The swimming pool shall be provided with an emergency drain down device; the drain down time should not excee…

Circulating cooling water

• 第 3.1.3 条The circulating cooling water system shall be provided independently, the circulating water flow rate of the …
• 第 3.1.5 条The make up water quality of the cooling tower shall comply with the provisions of the current national stand…
• 第 3.2.1 条The circulating cooling water system shall be provided with water quality stabilization treatment measures, i…
• 第 3.3.2 条Cooling towers shall be located in well ventilated positions that avoid hot air recirculation, and their nois…
• 第 6.1.1 条The circulating cooling water system should be provided with water quality stabilization treatment measures; …
• 第 6.1.3 条Cooling tower selection shall comply with: the circulating water flow rate of a single cooling tower should n…
• 第 6.2.2 条The effective volume of the cooling tower basin shall be calculated as 1.2 to 1.5 times the circulating water…
• 第 6.2.4 条The suction pipe flow velocity of the circulating water pump for the cooling tower should be 1.0 m/s–1.5 m/s,…
• 第 6.3.1 条The make up water volume for the circulating cooling water system shall be calculated at 1%–2% of the circula…
• 第 6.3.3 条The circulating cooling water system shall be equipped with an automatic make up water device, and the make u…
• 第 6.4.1 条Cooling towers should be located in well ventilated positions that avoid hot air recirculation, and the dista…
• 第 6.4.3 条Noise control for cooling towers shall comply with the current national standard GB 3096 "Environmental Quali…

Water feature

• 第 3.9.1 条The water quality of water features shall comply with the requirements of the current national standard "The …
• 第 3.9.2 条Water feature projects should be equipped with a circulating water treatment system, and the circulating wate…
• 第 3.9.3 条The water feature pool shall be provided with a makeup water pipe, drain pipe, overflow pipe and emptying fac…
• 第 3.9.5 条Water feature pumps should be installed outside the pool; where they must be installed inside the pool, safet…
• 第 3.9.7 条The water feature engineering of hotel buildings shall be provided with an independent water treatment system…
• 第 4.1.1 条The water quality of water features shall comply with the provisions of the current national standard "Water …
• 第 4.1.3 条Water used for water features should be recycled. The make up water volume of the circulation system should b…
• 第 4.1.4 条Water feature projects shall be provided with water treatment facilities. Where circulating water systems suc…
• 第 4.2.1 条Water features and pools shall be provided with overflow facilities, and the overflow water level shall be 50…
• 第 4.2.2 条The makeup water pipe for the water feature pool should be equipped with a backflow preventer to prevent back…
• 第 4.2.3 条Pumps for water feature projects should be submersible pumps; when dry installation is used, drainage facilit…
• 第 4.2.4 条Piping for water feature projects should use corrosion resistant materials, such as stainless steel pipes and…
• 第 4.2.5 条Water feature lighting shall use dedicated underwater luminaires with a voltage not exceeding 12V, and residu…
• 第 4.2.6 条Water feature projects should be equipped with an electrical control system to achieve functions such as sche…
• 第 4.2.7 条Water features' pools shall be waterproofed, with a waterproofing grade no lower than Grade 2. The pool struc…

Pipe material

• 第 3.2.1 条Pipes and fittings used in the domestic water supply system shall comply with the requirements of the current…
• 第 3.2.3 条Water supply pipes should be made of corrosion resistant materials that are easy to install and connect. Indo…
• 第 3.2.5 条The working pressure of the water supply pipe shall not exceed the nominal pressure or the marked allowable w…
• 第 3.2.7 条The coefficient of linear expansion for plastic water supply pipes is approximately 0.07 mm/(m·℃). When the l…
• 第 3.2.9 条Buried water supply pipes shall use corrosion resistant pipes with sufficient strength; plastic pipes shall n…
• 第 3.2.11 条When water supply pipes pass through floor slabs or walls, sleeves shall be provided, and the sleeve diameter…
• 第 3.5.1 条Water supply pipes shall be made of materials that are corrosion resistant, easy to install and connect, and …
• 第 3.5.2 条Indoor water supply pipes shall use plastic water supply pipes, plastic metal composite pipes, copper pipes, …
• 第 3.5.3 条Hot water pipes (hotel central hot water supply system) shall be made of high temperature resistant and corro…
• 第 3.5.4 条Drainage pipes (for hotel bathrooms, kitchens, etc.) shall be rigid polyvinyl chloride (PVC U) drainage pipes…
• 第 3.5.5 条In hotel buildings, the connection between drainage stacks and horizontal pipes shall use 45° wye branches or…
• 第 3.5.6 条Oil containing wastewater drainage pipes in hotel kitchens shall use oil resistant and high temperature resis…
• 第 3.5.7 条Hotel fire water supply piping (hydrant and automatic sprinkler systems) shall use hot dip galvanized steel p…
• 第 3.5.8 条When pipes (including water supply, drainage, and hot water) pass through areas with strict noise requirement…
• 第 3.5.9 条The pipes, fittings, and valves of hotel water supply pipelines (including cold and hot water) shall have a n…
• 第 3.5.10 条In hotel buildings, the water supply service pipe (connected from the municipal network) shall use ductile ir…

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