The design flow of building water supply inlet pipe shall meet the following requirements:
1 When all domestic water in the building is directly supplied by the outdoor pipe network, the design second flow of domestic water in the building should be taken;
2
When all the domestic water in the building is supplied by self-pressurization, the design flow of the inlet pipe should be the design water supply of the water storage regulating tank. The design water supply should not be greater than the maximum daily hourly water consumption of the building, nor should it be less than the maximum daily average hourly water consumption of the building;
three
When the domestic water in the building is directly supplied by the outdoor pipe network and pressurized by itself, the design flow shall be calculated according to paragraphs 1 and 2 of this article, and the superposition of the two shall be used as the design flow of the water inlet pipe. (safety calculation program)
3.6.4 The design second flow rate of domestic water supply pipes in residential buildings shall be calculated according to the following steps and methods:
1 According to the water supply equivalent, the number of users, the water quota, the hours of use and the hourly variation coefficient of the sanitary appliances configured in the house,
According to the formula (3.6.4- 1), the average outflow probability of water supply equivalent of sanitary ware can be calculated at the maximum water consumption. (Probability algorithm, uncertainty of service system, most modified)
(3.6.4- 1)
Where: uo-the average outflow probability of water equivalent of sanitary ware when the domestic water supply pipeline uses the maximum amount of water (%);
Qo—— water consumption quota of the highest water consumption day, which is taken according to Table 3. 1.9 of this specification;
M—— number of water users per household;
Kh—— hourly variation coefficient, which is taken according to Table 3. 1.9 of this specification;
Ng—— the number of water supply equivalents of sanitary appliances installed in each household;
T—— hours of water consumption (h);
0.2—— rated flow (L/s) of water supply equivalent of sanitary ware.
Table 3.6.5 Coefficient value (α value) depending on building use
Alpha value of building name
Kindergartens, nurseries and sanatoriums 1.2
Outpatient departments and clinics 1.4
Office buildings and shopping malls 1.5
Library 1.6
Bookstore 1.7
School 1.8
Hospitals, sanatoriums and sanatoriums 2.0
Serviced apartment 2.2
Dormitories (category I and II), hotels, guest houses and guesthouses 2.5
Passenger Stations, Terminal Buildings, Exhibition Centers and Public Toilets 3.0
2 According to the calculation of the total water supply equivalent of sanitary ware on the pipeline section, it can be calculated according to formula (3.6.4-2).
(3.6.4-2)
Probability that the water equivalent of sanitary ware flows out from this part at the same time:
Where: u —— Calculate the water supply equivalent and simultaneous outflow probability (%) of sanitary wares in the pipe section;
αC- coefficient corresponding to different uo, see Table C in Appendix C of this specification;
Ng—— Calculate the total water supply equivalent of sanitary ware in the pipe section.
3. According to the calculated probability that the water supply equivalent of sanitary ware on the pipe section flows out at the same time, the design second flow of the pipe section can be calculated according to formula (3.6.4-3):
qg=0.2？ u？ Unqualified (3.6.4-3)
Where: qg—— Calculate the design second flow (L/s) of the pipe section.
Note: 1 For quick and convenient calculation, after uo calculation, the designed feed water second flow qg can be directly found from the calculation table in Appendix E according to the ng value of the calculated pipe section. The table can be interpolated;
2 when the total water supply equivalent of sanitary ware in the calculation section exceeds the maximum value in table e, the maximum hourly water consumption should be taken as the design flow.
(3.6.4-4)
four
When the main water supply pipe has two or more water supply branches with different average outflow probability of water supply equivalent of sanitary ware at the maximum water consumption, the average outflow probability of water supply equivalent of sanitary ware at the maximum water consumption in this section shall be calculated according to formula (3.6.4). -4):
Where: uo-the average outflow probability of water supply equivalent of sanitary ware in the main water supply pipe;
UOI—— the average outflow probability of water supply equivalent of sanitary ware at the maximum water consumption of branch pipe;
Ngi—— the total water supply equivalent of sanitary ware in the corresponding branch pipe.
3.6.5
Design second flow of domestic water supply for dormitories (Class I and II), hotels, guesthouses, serviced apartments, hospitals, sanatoriums, kindergartens, sanatoriums, office buildings, shopping malls, libraries, bookstores, passenger stations, terminal buildings, exhibition centers, primary and secondary school teaching buildings, public toilets, etc.
Should be calculated by the following formula? (Classification of buildings)
(3.6.5)
Where: qg —— Calculate the design second flow (L/s) of water supply in this section;
Ng —— Calculate the total water supply equivalent of sanitary ware in the pipe section;
α —— the coefficient depending on the use of the building, which shall be adopted according to Table 3.6.5.
Note: If the calculated value 1 is less than the maximum rated flow of sanitary ware water supply in this section, the maximum rated flow of sanitary ware water supply shall be adopted for the design second flow;
2 If the calculated value is greater than the cumulative flow value according to the rated flow rate of sanitary ware water supply on the pipe section, it should be adopted according to the cumulative flow value of the rated flow rate of sanitary ware water supply;
three
For the water supply pipeline section with toilet delay self-closing flushing valve, the water supply equivalent of toilet delay self-closing flushing valve shall be calculated as 0.5. After the calculated qg is added with the flow rate 1. 10L/s, the second flow rate is designed for the water supply in this section.
4 The α value of the complex building should be calculated by weighted average method.
3.6.6
Design flow of domestic water supply pipes in dormitories (Class III and IV), living rooms of industrial enterprises, public bathrooms, kitchens of staff canteens or business restaurants, stadiums, theaters, general physical and chemical laboratories, etc. Should be calculated according to the following formula? (Detailed classification)
qg=∑qoNob (3.6.6)
Where: qg—— Calculate the design second flow (L/s) of water supply in this section;
Qo—— the rated water flow (L/s) of the same type of sanitary ware;
Number of sanitary wares of the same type;
B—— percentage of sanitary ware supplying water at the same time, which is adopted according to table 3.6.6- 1 ~ table 3.6.6-3 of this specification.
Note: If the calculated value 1 is less than the maximum rated flow of sanitary ware water supply in this section, the maximum rated flow of sanitary ware water supply shall be adopted for the design second flow;
2. The self-closing flushing valve in the toilet should be calculated separately. When the calculated value of a single row is less than 1.2L/s, it shall be calculated as 1.2L/s; Calculated when it is greater than1.2l/s.
Table 3.6.6- 1 Dormitory (Category III and IV), living room of industrial enterprise, public bathroom, theater,
Proportion of simultaneous water supply for sanitary wares such as stadiums and gymnasiums (%)
Wei sheng qi you Ming Ming dormitory
(III) Industrial enterprises
Living room, public bathroom, theater, gym.
Wash basin (pool) 30 33151515
Wash basin -50 50 70 (50)
Wash basin and sink 60 ~10060 ~10060 ~10060 ~1005080
Bathtub -50-
Shower without space100100100-100
Spacing shower 80 80 60 ~ 80 (60 ~ 80) (60 ~ 100)
Flushing water tank 70 30 20 50(20) 70(20)
Automatic flushing water tank for toilet100100-100100
Toilet self-closing flush valve 2 2 2 10(2) 15(2)
Urinal self-closing flush valve101010 50 (10) 70 (10)
Urinal automatic flushing water tank (water tank)-100100100100.
Wash basin -33-
Water dispenser 30 ~ 60 30 30 30 30 30
The washbasin in the canteen -50 50 50
Note: The values in brackets in table 1 are used for changing rooms in cinemas and theatres and athletes' lounges in sports venues;
In this table, the bathroom of fitness center can use the same water supply ratio as the athletes' lounge of sports venues.
Table 3.6.6-2 Percentage of simultaneous water supply for kitchen equipment in staff dining room and business dining room
Name of kitchen equipment and percentage of simultaneous water supply
Sewage pond (pond) 50
Wash basin (sink) 70
Boiling pot 60
The productive washing machine 40
Dishwasher 90
The boiler 50
Steam generator 100
The furnace wat nozzle 30
Note: The water nozzle of the dishwashing table in the staff canteen or student canteen is supplied with water at the same time according to 100%, but it is not superimposed with the kitchen water.
(not used simultaneously)
Table 3.6.6-3 Percentage of simultaneous water supply from laboratory test nozzles (%)
Test nozzle name and water supply percentage at the same time.
Scientific research teaching laboratory production laboratory
A single test nozzle 20 30
Double or triple test nozzles 30 50