3 Water Supply 1
3.1 Water Consumption Ration and Water Pressure 1
3.2 Water Quality and Prevention of Water Pollution 5
3.3 System Selection 7
3.4 Pipe Materials, Accessories, and Meters 7
3.5 Pipeline Arrangement and Laying 10
3.6 Design Flow Rate and Pipe Hydraulic Calculations 12
3.7 Water Towers, Tanks, and Cisterns 17
3.8 Pressurization Equipment and Pumping Houses 19
3.9 Swimming Pools and Aquatic Swimming Pools 22
3.10 Cooling Towers and Recycled Cooling Water 25
3.11 Water Feature 27
4 Water Drainage 28
4.1 Selection of Systems 28
4.2 Sanitary ware and water storage bend 28
4.3 Pipe layout and laying 29
1 General
1.0.1 In order to ensure the quality of design of water supply and drainage of the building, so that the design meets the basic requirements of safety, hygiene, applicability, and economy, the development of this specification.
1.0.2 This specification applies to residential neighborhoods, civil buildings, water supply and drainage design, also applies to industrial buildings and industrial building water supply and drainage design of roof rainwater.
But the design of the following projects, should also be in accordance with the current relevant specialized codes or regulations:
1 wet subsidence loess, frozen soil and expansion and contraction of soil and other areas of the building.
2 seismic intensity of more than 9 degrees of the building.
3 Mineral water treatment, human defense buildings.
4 Industrial production water supply and drainage.
5 Building water.
1.0.3 Building water supply and drainage design, should be used to meet the requirements at the same time should also be for the construction and installation, operation and management, maintenance and testing, as well as security and protection to provide convenient conditions.
1.0.4 Building water supply and drainage engineering design, in addition to the implementation of this specification, should also be consistent with the current national standards and norms.
3 water supply
3.1 water quota and water pressure
3.1.1 Residential water supply design water consumption should be determined according to the following water consumption:
1 Residential water consumption;
2 water consumption of public **** building;
3 greening water consumption;
4 water, recreational facilities water consumption;
5 Roads, water supply, water supply, water consumption, water supply, water supply, water supply, water supply, water supply, water supply, water supply, water supply and water consumption.
5 Water consumption for roads and squares;
6 Water consumption for utilities;
7 Unforeseen water consumption and leakage of water from pipeline network;
8 Water consumption for fire fighting.
Note: Fire-fighting water consumption is only used for calibration of pipe network calculations and is not part of normal water consumption.
3.1.2 Residential community residential water consumption, on the basis of the population of the community and Table 3.1.9 of the maximum daily residential water consumption quota is determined by calculation.
3.1.3 Public **** building water consumption in residential areas, according to the nature of its use, scale, using Table 3.1.10 in the water quota calculated to determine.
3.1.4 Residential greening watering quota can be calculated according to the watering area of 1.0 ~ 3.0L/m2 d. The watering area can be increased as appropriate; public swimming pools can be increased as appropriate. Arid areas can be increased as appropriate; communal swimming pools, water swimming pools and water features water consumption is determined in accordance with the provisions of Article 3.9.17, 3.9.18, 3.11.2.
3.1.5 Residential roads, squares, watering water quota can be calculated according to the watering area of 2.0 ~ 3.0L / m2 d.
3.1.6 The amount of water used for fire fighting in residential areas and water pressure and fire continuation time should be determined in accordance with the current "Building Design Fire Prevention Code" and "Code for the Design and Fire Protection of High-rise Civil Buildings".
3.1.7 The sum of water leakage and unforeseen water in the pipe network of the residential district can be 10% to 15% of the maximum daily water consumption.
3.1.8 The water consumption of the utilities in the residential area should be provided by the management of the facility, and when there is no major utilities, no additional water consumption.
3.1.9 The maximum daily domestic water consumption quota and the hourly variation coefficient of a residence may be determined according to Table 3.1.9, based on factors such as the type of residence, the building standard, the degree of perfection of sanitary appliances and the area.
Table 3.1.9 Maximum daily domestic water consumption quota and hourly variation coefficient for dwellings
Dwelling
Category Sanitary Ware Setting Standard Water Consumption Quota
(L/person.d) Hourly Variation
Coefficient of Change
Popularity
Community
Dwelling
Households I With Toilet, Washing Basin 85～150 3.0～2.5
II With toilet, washbasin, washing basin, laundry basin, water heater and bathing equipment 130～300 2.8～2.3
III With toilet, washbasin, washing basin, washing machine, centralized hot water supply (or domestic hot water unit) and bathing equipment 180～320 2.5～2.0
Villa with toilet, washbasin, washbasin, washing machine, sprinkler, domestic hot water supply and bathing equipment 200 ~ 350 2.3 ~ 1.8
Note: 1 local authorities on residential water use quotas have specific provisions, should be implemented in accordance with local regulations.
2 villa water quota including courtyard water and car wiping water
3.1.10 collective dormitories, hotels and other public **** building living water quota and hourly variation coefficient, according to the degree of perfection of sanitary appliances and regional conditions, can be determined in accordance with Table 3.1.10.
Table 3.1.10 Group dormitories, hotels and other public **** building living water quota and hourly change coefficient
No. Building name Unit Maximum daily living water quota (L) hours of use (h) Hourly change coefficient Kh
1 Single employee dormitory, student dormitory, guest house, training center, general hotel
Equipped with a common Washroom
Set up communal washroom, shower room
Set up communal washroom, shower room, laundry room
Set up single restroom, communal laundry room
14 Indoor floor flushing nozzle 0.20 1.00 15 0.050
15 Domestic washing machine nozzle 0.20 1.00 15 0.050
Note: 1 Values in parentheses in the table are for separate calculations for cold or hot water when hot water is available.
2 When a shower is attached to the tub, or when the mixing spout has a shower transfer switch, the rated flow rate and equivalent are only counted for the spout, not the shower. However, the water pressure should be counted according to the shower.
3 domestic gas water heaters, the required water pressure according to product requirements and hot water supply system, the most unfavorable distribution point required to determine the working pressure.
4 Automatic sprinkler irrigation for green spaces should be designed according to product requirements.
3.2 Water quality and prevention of water pollution
3.2.1 The water quality of the domestic water supply system should meet the current national standards "drinking water health standards" requirements.
3.2.2 The water quality of life miscellaneous water system, should be consistent with the current industry standard "life miscellaneous water quality standards" requirements.
3.2.3 City water supply piping is strictly prohibited and self-supplied water supply piping directly connected.
3.2.4 Drinking water shall not be contaminated due to siphon backflow from the pipeline, and the outlet of the water distribution parts of the drinking water pipeline shall comply with the following provisions:
1 The outlet shall not be flooded by any liquid or impurity;
2 The minimum air gap of the outlet higher than the edge of the overflow of the container that receives the water shall be not less than 2.5 times the diameter of the outlet;
3 special appliances can not set the minimum air gap, should be set up pipeline backflow preventer or take other effective isolation measures.
3.2.5 When the following water pipes are connected directly from the water supply pipes, pipe backflow preventers or other effective devices to prevent backflow pollution shall be installed on these water pipes:
1 Individually connected to the fire fighting water pipes, at the beginning of the fire fighting water pipes;
Note: Excluding outdoor fire hydrants connected to the outdoor water supply pipes.
2 From the city water supply pipeline directly suction pump, the suction pipe at the beginning;
3 When the swimming pool, water swimming pool, Jacuzzi, water features ornamental pools, circulating cooling water catchment ponds, etc., filling or replenishment of water pipeline outlet and the overflow level of the air gap between the exit level of the pipe is less than the exit diameter of 2.5 times, in the charging (replenishment) of the water;
4 Directly from the city water supply pipeline to the boiler
5 The starting end of the flushing pipes and animal drinking water pipes of the garbage disposal station, animal farms (including the feeding and exhibition area of the zoo);
6 The starting end of the pipes of the automatic sprinkler irrigation system of the green area, etc., when the sprinkler head is of the underground type or the automatic lifting type;
7 The starting end of the pipes from the City water supply ring network of different pipe sections connected to the introduction of the pipe to the residential community water supply, and the community water supply pipe and the city water supply pipe to form a ring network, the introduction of the pipe on the (generally after the total water meter).
3.2.6 It is strictly prohibited to live drinking water pipeline and toilet (tank) directly connected.
3.2.7 Drinking water piping should avoid toxic contamination areas, when the conditions can not be avoided, protective measures should be taken.
3.2.8 Drinking water pool (box) should be set up separately from other water pool (box).
3.2.9 Buried drinking water cisterns around 10m or less, there shall be no septic tanks, sewage treatment buildings, seepage wells, garbage dumps and other sources of pollution; around 2m or less, there shall be no sewage pipes and pollutants. When this requirement is not met, anti-pollution measures should be taken.
3.2.10 living water in the building pool (box) body, should be used in the form of an independent structure, shall not use the building's body structure as a pool (box) of the wall plate, base plate and roof.
Living water pool (box) and other water pool (box) set up side by side, there should be their own independent partition wall, not *** with a partition wall, partition wall and partition wall should be between the drainage measures.
3.2.11 building living water pool (box) should be located in a special room, the room above it should not be toilets, bathrooms, lavatories, kitchens, sewage treatment rooms.
3.2.12 living water pool (box) construction and piping, should be consistent with the following provisions:
1 manhole, vent pipe, overflow pipe should prevent insects from climbing into the pool (box) measures.
2 inlet pipe should be in the pool (box) overflow level above the access, when the overflow level is difficult to determine, the inlet pipe mouth of the lowest point above the overflow edge height equal to the diameter of the inlet pipe, but the minimum should not be less than 25mm, the maximum should not be greater than 150mm.
When the inlet pipe mouth for the flooding of the outflow, the pipe should be drilled at the top of the hole, the hole diameter should not be less than the diameter of the pipe 1/5. hole should be equipped with a suction valve of the same diameter. Installation of the same diameter of the suction valve or other devices that can destroy the vacuum generated in the pipe.
Note: There is no siphon backflow of the low pool, the inlet pipe is not subject to the restrictions of this paragraph, but the inlet pipe is still appropriate to enter the pool from the highest water surface above.
3 inlet and outlet pipe arrangement shall not produce a short-circuit water flow, if necessary, should be equipped with a diversion device.
4 shall not accept the fire pipe pressure test water, pressure relief water and other backflow or overflow water.
5 Drainage pipe and overflow pipe outlet, shall not be directly connected to the drainage structure or drainage pipe, should take the indirect drainage way.
6 Pool (box) material, lining materials and interior paint, shall not affect water quality.
3.2.13 When the domestic drinking water pool (box) in the storage water, 48h can not be renewed, should be set up water disinfection treatment device.
3.2.14 In the non-potable water pipeline connected to the spout or water short pipe, should take measures to prevent accidental drinking and misuse.
3.3 System Selection
3.3.1 The outdoor water supply system of the residential area shall meet the requirements of all the water in the residential area.
The pressurized water supply system of the residential area shall try to use the water pressure of the municipal water supply network to supply water directly. When the municipal water supply network water pressure, water shortage, should be set up to regulate water storage and pressurization devices.
3.3.2 Residential pressurized water supply system, should be based on the size of the district, the height of the building and the distribution of buildings and other factors to determine the number of pressurized stations, size and water pressure.
3.3.3 The water supply system of different nature of use or billing in the building should be divided into their own independent water supply network after the introduction of the pipe.
3.3.4 Sanitary ware water supply fittings to withstand the maximum working pressure, shall not be greater than 0.6MPa.
3.3.5 High-rise buildings should be vertically partitioned living water supply system, vertical partitioning should meet the following requirements:
1 The static water pressure at the point of distribution of the lowest sanitary ware in each sub-district should not be greater than 0.45MPa, and in special cases should not be greater than 0.55MPa;
2 water pressure greater than 0.35MPa pipe (or water distribution pipe), it is appropriate to set up a pressure reduction or pressure regulation settings;
3 the most unfavorable water pressure distribution point in each sub-district, should meet the water pressure requirements.
3.3.6 Building height does not exceed 100m building life water supply system, it is appropriate to use vertical zoning parallel water supply or zoning pressure reduction water supply. Building height of more than 100m building, it is appropriate to use vertical series of water supply.
3.4 Pipes, accessories and water meters
3.4.1 Pipes and fittings used in the water supply system should meet the requirements of the current product standards. Pipes and fittings of the working pressure shall not be greater than the product standard nominal allowable working pressure.
3.4.2 Buried water supply pipe used in the pipe, should be corrosion-resistant and can withstand the corresponding ground loading capacity. Plastic water pipes can be used, lined cast iron water pipes, steel pipes by reliable anti-corrosion treatment.
3.4.3 indoor water supply pipe, should be corrosion-resistant and easy to connect the installation of reliable pipe, plastic water pipes, plastic and metal composite pipe, copper pipe, stainless steel pipe and by reliable anti-corrosion treatment of steel pipe.
3.4.4 The material of the various types of valves used on the water pipeline, should be corrosion-resistant and pressure-resistant. According to the size of the pipe diameter and the level of pressure and use of temperature, can be used all copper, all stainless steel, iron shell copper heart and all plastic valves.
3.4.5 The following parts of the water supply pipeline should be set up valves:
1 Residential water supply pipeline from the municipal water supply pipeline on the introduction of the pipeline section.
2 residential outdoor ring pipe network nodes, should be set according to the separation requirements. When the ring pipe section is too long, it is appropriate to set up sectional valves.
3 From the residential district water supply trunk pipe connected to the beginning of the branch pipe or the beginning of the household pipe.
4 Household pipes, water meters and branch risers.
5 Indoor water supply pipe to households, public **** bathroom and other out of the distribution pipe start; distribution branch pipe distribution point in three and more than three should be set.
6 Pools, tanks, pressurized pumping stations, heaters, pressure reducing valves, pipeline backflow preventer should be configured according to the installation requirements.
3.4.6 Valves used on the water supply pipeline, should be used according to the following principles of selection:
1 need to regulate the flow rate, water pressure, it is appropriate to use the regulator valve, globe valve;
2 requirements of the parts of the water resistance (such as the pump suction pipe), it is appropriate to use the gate valve;
3 installation of space is small, it is appropriate to use the butterfly valve, ball valve;
4 water flow resistance, it is appropriate to use the butterfly valve, ball valve;
4 water flow, it is appropriate to use the water supply pipeline, it is appropriate to use the water pump suction pipe. p>
4 water flow in both directions on the pipe section, shall not use the globe valve;
5 larger caliber pumps, the outlet pipe should be used multi-functional valves;
3.4.7 water supply pipeline should be set on the following sections of the non-return valves:
1 introduction of the pipeline;
2 water heater or water equipment water intake pipe sealed;
3 On the outlet pipe of a water pump;
4 On the outlet pipe section of a water tank, water tower, or upland pool where the inlet and outlet pipes are combined in one pipe.
Note: Pipe sections equipped with pipe backflow preventer, do not need to install check valves.
3.4.8 Check valve valve type selection, should be based on the installation of check valve parts, valve water pressure, after the closure of the closure of the performance requirements and the closing of the water hammer triggered by the size of the factors to determine the following requirements should be met:
1 valve water pressure before the small parts of the appropriate selection of the spinning type, ball and shuttle check valve.
2 Close the parts of the sealing performance requirements tight, it is appropriate to use the closing spring check valve.
3 Requirements for the weakening of the closing part of the water hammer, it is appropriate to use the quick closing muffler check valve or slow closing check valve with damping device.
4 Check valve valve break or spool, should be able to close itself under the action of gravity or spring force.
3.4.9 The pressure of the water supply network is higher than the maximum permissible pressure of the water distribution point, should be set up pressure reducing valve, pressure reducing valve configuration should meet the following requirements:
1 Proportional pressure reducing valve should not be greater than the ratio of 3:1; adjustable pressure reducing valve valve valve and the valve should not be greater than the maximum difference between the pressure 0.4MPa, the requirements of the environment should not be greater than the place of quiet 0.3MPa.
2 The maximum pressure at the water distribution after the valve should be calibrated according to the failure of the pressure reducing valve, and its pressure should not be greater than the water test pressure specified in the product standard of the water distribution parts.
Note: 1 When the pressure reducing valve is used in series, the maximum pressure after the valve is calculated according to one of the failure cases.
2 The test pressure of water distribution parts is generally calculated as 1.5 times of its working pressure.
3 The water pressure in front of the pressure reducing valve should be kept stable, and the pipeline in front of the valve should not be used as a water distribution pipe.
4 When the pressure after the valve allows fluctuations, it is appropriate to use proportional pressure reducing valve; when the pressure after the valve requires stability, it is appropriate to use adjustable pressure reducing valve.
5 high water supply guarantee requirements, water supply will cause significant economic losses on the water supply pipeline to set up a pressure reducing valve, it is appropriate to use two pressure reducing valves, set up in parallel, a backup work, but shall not set up a bypass pipe.
3.4.10 The setting of pressure reducing valves shall comply with the following requirements:
1 The nominal diameter of the pressure reducing valve shall be consistent with the pipe diameter.
2 Valves and filters should be set up before the pressure reducing valve; after the pressure reducing valve that needs to be disassembled to be serviced, pipeline expanders should be set up; when the water will flow backward after the valve during servicing, a valve should be set up after the valve.
3 Pressure reducing valve nodes should be installed before and after the pressure gauge.
4 Proportional pressure reducing valve should be installed vertically, adjustable pressure reducing valve should be installed horizontally.
5 Set up the parts of the pressure reducing valve, should be easy to pipeline filter drainage and pressure reducing valve maintenance, the ground should have drainage facilities.
3.4.11 When the water supply network there is a short-term overpressure conditions, and short-term overpressure will cause the use of insecurity, should be set up pressure relief valves, pressure relief valves should be set up in accordance with the following requirements:
1 pressure relief valves used for pipeline pressure relief, the valve should be set up in front of the valve.
2 Relief valve relief port, should be connected to the pipeline, pressure relief water should be discharged into the non-domestic pool, when the direct discharge, there should be energy dissipation measures.
3.4.12 The safety valve valve shall not be set before the valve, the pressure relief port should be connected to the pipeline to lead the pressure relief water (vapor) to a safe place to discharge.
3.4.13 The following parts of the water pipeline should be set up exhaust devices:
1 intermittent use of water supply network, the end of the network and the highest point should be set up automatic exhaust valve.
2 water supply pipe network has obvious undulation accumulation of air pipe section, has been in the section of the peak of the automatic exhaust valve or manual valve exhaust.
3 pneumatic water supply device, when the use of automatic replenishment of pneumatic water tanks, the highest point of the distribution network should be set up automatic exhaust valve.
3.4.14 water supply system regulating pool (box), in addition to water inlet can be automatically controlled to cut off the water inlet, its water inlet pipe should be equipped with automatic water level control valves, water level control valves should be the same nominal diameter and inlet pipe diameter.
3.4.15 The following parts of the water supply pipeline should be set up pipeline filter;
1 pressure reducing valve, automatic water level control valves, temperature control valves and other valves should be set up before.
2 On the water heater inlet pipe, heat exchange device should be set on the circulating cooling water inlet pipe.
3 Pipeline filter should be set on the suction pipe of water pump.
4 It should be set in front of the water inlet master meter; it should be set in front of the residential inlet water meter.
Note: The filter mesh should be made of corrosion-resistant materials, and the mesh size should be determined according to the requirements of use.
3.4.16 The introduction of the building's pipe, residential pipe and public buildings need to measure the amount of water in the water pipe should be set on the water meter.
3.4.17 Residential water meter should be relatively centralized reading, and should be set outdoors; set up in the household water meter, it is appropriate to use remote transmission water meter or IC card water meter and other intelligent water meter.
3.4.18 water meter caliber should be determined in accordance with the following provisions:
1 water meter caliber should be consistent with the diameter of the water supply pipeline interface pipe;
2 uniform water consumption of water supply system should be used to feed the water meter with water supply water design flow rate selected water meter of the common flow rate.
3 uneven water consumption of domestic water supply system water meter should be selected by the design flow rate of water meter overload flow.
4 In the fire in addition to domestic water still need to pass the fire flow meter, should be the design flow of domestic water superimposed on the fire flow for verification, verification flow should not be greater than the overload flow meter.
3.4.19 The water meter should be installed in the observation of convenient, not frozen, not by any liquid and impurities inundated and not easily damaged place.
Note: All kinds of flow meters with the function of accumulating water can replace the water meter.
3.4.20 Water supply pressurization system, should be based on the pump head, pipeline direction, environmental noise requirements and other factors, set up water hammer elimination device.
3.4.21 Sound insulation and noise prevention requirements of strict places, water piping bracket should be used vibration isolation bracket; water distribution pipe should be set up at the beginning of the water hammer absorption device; water distribution branch pipe and sanitary appliances with the water distribution parts of the connection should be used to connect the hose.
3.5 Pipe layout and laying
3.5.1 Residential outdoor water supply pipe network, it is appropriate to be arranged into a ring network, or with the municipal water supply pipe connected to a ring network.
Ring water supply network and municipal water supply pipe connection pipe should not be less than two, when one of the failure, the remaining connection pipe should be able to pass not less than 70% of the flow.
3.5.2 Residential outdoor water supply pipe, should be laid along the roads in the area parallel to the building, it is appropriate to lay in the sidewalks, slow lanes or under the grass; pipeline wall from the outside wall of the building net distance should not be less than 1m, and shall not affect the foundation of the building.
Outdoor water supply piping in residential areas and other underground pipelines and trees between the minimum clearance, should be in line with the provisions of Appendix A of this specification.
3.5.3 Outdoor water supply pipe depth of cover shall be determined according to the soil freezing depth, vehicle load, pipe material and pipe crossing and other factors. Minimum depth of soil cover at the top of the pipe shall not be less than 0.15m below the soil freezing line, and the depth of soil cover of the pipeline under the carriageway should not be less than 0.7m.
3.5.4 Outdoor water supply pipeline valves, it is appropriate to set up the valve well or valve sleeve.
3.5.5 Laying in the outdoor integrated pipe corridor (ditch) in the water supply pipe, hot water, heat pipes below, refrigerated pipes and drainage pipes above. Water supply pipe in a variety of pipes between the net distance, should meet the requirements of the installation operation, and should not be less than 0.3m.
Indoor cold, hot water pipe up and down parallel laying, cold water pipe should be below the hot water pipe; vertical parallel laying, cold water pipe should be in the hot water pipe on the right.
Life water supply pipes should not be laid in the same corridor (ditch) with the pipeline conveying flammable, combustible or hazardous liquids or gases.
3.5.6 Indoor living water supply pipe should be arranged into a branch pipe network, unidirectional water supply.
3.5.7 Indoor water supply pipelines should not cross the power distribution room, elevator room, communications room, large and medium-sized computer rooms, computer network centers, audio-visual library and other water will damage the equipment and cause accidents in the room, and should be avoided in the production of equipment above the passage.
The arrangement of indoor water supply pipes shall not impede production operations, transportation and use of buildings.
3.5.8 Indoor water supply pipes shall not be arranged above the raw materials, products and equipment that will cause combustion and explosion when exposed to water.
3.5.9 Buried water supply pipe should be avoided to be arranged in the possibility of being crushed by heavy objects. Pipeline shall not cross the production equipment foundation, in special circumstances must be crossed, effective protection measures should be taken.
3.5.10 water pipes shall not be laid in the flue, air ducts, elevator shafts, drainage ditches. Water pipes should not cross the windows, closets, water pipes shall not pass through the toilet tank and urinal, and the riser from the big and small urinal end shall not be less than 0.5m.
3.5.11 water pipes should not cross the expansion joints, settlement joints, deformation joints. If you have to cross, should be set to compensate for pipe expansion and shear deformation of the device.
3.5.12 Plastic water supply pipe indoors should be concealed. Explicitly set up when the standpipe should be arranged in the impact is not easy to place, such as can not be avoided, should be outside the pipe plus protective measures.
3.5.13 Plastic water supply pipe shall not be arranged on the edge of the stove; open plastic water supply riser from the edge of the stove shall not be less than 0.4m, according to the edge of the gas water heater should not be less than 0.2m. Can not meet this requirement, there should be protective measures.
Plastic water piping shall not be directly connected to the water heater or hot water furnace, there should be no less than 0.4m of metal pipe section transition.
3.5.14 indoor water supply piping on a variety of valves, it is appropriate to install in a location that is easy to access and easy to operate.
3.5.15 buried life in the building and the minimum clear distance between the drainage pipe, parallel burial should not be less than 0.5m; cross-buried should not be less than 0.15m, and the water supply pipe should be in the drainage pipe above.
3.5.16 Expansion compensation device for water supply pipe, should be calculated according to the straight line length, the linear expansion coefficient of the pipe, the ambient temperature and the change in water temperature inside the pipe, the permissible displacement of the pipe node and other factors. Should try to use the pipe itself to compensate for temperature deformation of the folded corners.
3.5.17 When the condensation of water pipeline will affect the environment, causing damage to decorations, objects, etc., the water pipeline should be anti-condensation cold layer, anti-condensation cold layer of the calculation and construction, according to the current "equipment and pipeline cooling technology," the implementation of the "General Principles.
3.5.18 water pipeline concealed, should meet the following requirements:
1 shall not be laid directly in the building structure;
2 trunk and riser should be laid in the ceiling, tube wells, pipe holes, branch pipe should be laid in the floor (floor) surface of the leveling layer or along the wall in the pipe groove;
3 laying in the leveling layer or pipe groove of the water branch pipe Outer diameter should not be greater than 25mm;
4 laying in the leveling layer or pipe groove pipe material should be used plastic, metal and plastic composite pipe or corrosion-resistant metal pipe;
5 laying in the leveling layer or pipe groove pipe, such as the use of ferrule-type or ring-type interface connection of the pipe, it is desirable to use the manifold to the sanitary appliances, water distribution, there shall be no connecting fittings, the ends of the interface should be clearly exposed. There shall be no connecting fittings in the middle, and the connectors at both ends shall be exposed. The ground should have temporary marking of the location of the pipe.
3.5.19 The size of the pipe wells should be based on the number of pipes, pipe size, arrangement, maintenance conditions, combined with the building plan and structural form and other reasonable determination. Pipe wells need to enter the maintenance of pipelines, the net width of the maintenance personnel working channel should not be less than 0.6m; pipe wells should be set up at each level of the external access door.
The fire resistance limit of the wall and access door of the pipe well and the vertical fire partition of the pipe well should be in line with the provisions of the fire code.
3.5.20 The water supply pipe should avoid crossing the basement of the human defense, must cross the storm valve should be set according to the requirements of the human defense project.
3.5.21 need to drain the water supply pipe, its cross-pipe should be equipped with 0.002 ~ 0.005 slope slope drain.
3.5.22 water supply pipe through the following parts or take over, should be set up waterproof casing:
1 through the basement or underground structures at the outer wall;
2 through the roof;
Note: there are reliable waterproofing measures, can not be set up casing.
3 Through the reinforced concrete pool (box) wall or floor connection pipe.
3.5.23 open water supply riser through the floor, waterproofing measures should be used.
3.5.24 In the outdoor open water supply pipe, should be avoided by direct sunlight, plastic water supply pipe should also have effective protection measures; in the freezing area should be made of insulation, insulation shell, should be sealed impermeable.
3.5.25 Laying in the room may freeze, basement and pipe diameter, pipe trench and other places of the water supply pipe should be anti-freezing measures.
3.6 Design flow and hydraulic calculation of pipes
3.6.1 The design flow of outdoor water supply pipes in residential areas shall be determined in accordance with the following provisions:
1 When the size of the residential area of 3,000 people and the following, and the outdoor water supply pipe network is a branch pipe network, its residential and small areas supporting the cultural and sports, catering and entertainment, stores and markets, etc., the set of water for life Design flow should be calculated according to the provisions of this specification 3.6.3, 3.6.4 and 3.6.5 node flow and pipe flow.
2 When the size of the residential district in 3000 people or more, outdoor water supply network for the ring, and in line with the provisions of this specification 3.5.1, its residential should be calculated in accordance with the provisions of Article 3.1.9 of this specification, the maximum water use of the average second flow for the node flow. Supporting cultural and sports, catering and entertainment, stores and markets and other facilities within the district living water design flow, should be calculated in accordance with the provisions of this specification 3.1.10 maximum water hourly average second flow as the node flow.
3 supporting cultural and educational, health care, community management and other facilities within the district, as well as greening and landscape water, roads and squares sprinkler, water for public **** facilities, etc., are calculated by the average water use hourly average second flow rate as the nodal flow.
Note: 1 The unanticipated amount of water and pipe network leakage is not included in the nodal flow rate of the pipe network, only in the calculation of the introduction of the pipe network of the community and the city pipe network connection, consider reserving this margin.
2 Any public **** building that is not part of the community support should be counted separately.
3.6.2 The outdoor water supply pipe of the residential district, regardless of the size of the district and the shape of the network, should be calculated according to the provisions of paragraph 2 of Article 3.6.1 node flow rate, and then superimposed on a fire in the area of the maximum fire flow rate (with fire water storage and water supply of special fire fighting pipelines should be deducted from the portion of the pipeline), the pipeline for hydraulic calculations to verify the pipeline at the end of the outdoor hydrants from the ground water pressure, not to be Less than 0.1MPa.
Outdoor water supply pipe with outdoor fire hydrant, the pipe diameter shall not be less than 100mm.
3.6.3 Design flow rate of water supply pipe in the building, in line with the following requirements:
1 When all the domestic water in the building is supplied directly by the outdoor pipe network, take the design of the second flow rate of the domestic water in the building.
2 When the building of domestic water supply all self-pressurized, the introduction of the design flow of the pipe should be the design of the water storage and regulating pool of water replenishment. Design water should not be greater than the maximum maximum day of the building water consumption, and shall not be less than the maximum average day of the building water consumption.
3 When the building's domestic water both outdoor pipe network direct water supply, but also their own pressurized water supply, should be calculated in accordance with paragraphs 1 and 2 of this article after the design flow, the two superimposed as the introduction of the design flow of the pipe.
3.6.4 Residential building life water supply pipe design second flow, shall be calculated in accordance with the following steps and methods:
1 According to the residential configuration of sanitary appliances to the water equivalent, the number of people using, water consumption quota, the number of hours of use and hourly variation coefficient, according to 3.6.4-1 type of calculation out of the maximum water consumption of sanitary appliances to the water equivalent average outflow probability:
( 3.6.4-1)
In the formula U0 - the maximum water supply pipeline sanitary appliances water supply equivalent average outflow probability (%);
q0 - the maximum water use day of the water quota, according to Table 3.1.9;
m - the number of people using water per household;
Kh - hourly variation coefficients, according to the expression of 3.1.9; < /p>