/kloc-High-rise buildings above 0/0 floor are generally comprehensive multifunctional buildings (except high-rise residential buildings) integrating catering, shopping malls, entertainment, hotels and writing rooms. The cold and hot water load is large, and the water supply reliability is relatively high.

2. Fire fighting water consumption varies with the building type and height. The water consumption of indoor fire hydrant in buildings with height H & gt50m is higher than that of similar buildings with H≤ 50m 10L/S, and the building height H >；; 100m buildings (except toilets and washrooms) shall be equipped with automatic sprinkler systems. Fire duration of indoor fire hydrants in commercial buildings, exhibition buildings, comprehensive buildings, financial and trade centers, important scientific research buildings, archives buildings, book buildings, high-end hotels, commercial and residential buildings, etc. For a class of buildings, the duration of outdoor fire is 30L/S, and the duration of indoor fire is 30L/s when H≤ 50m. H & gt50m is 40L /S, and other high-rise buildings can be counted as 2h. The duration of the automatic sprinkler system is 1h, and the water consumption standard for intermediate and dangerous levels is generally (26 ~ 30l)/s s. ..

3. Minimum hydrostatic pressure

Because of the high height of high-rise buildings, it is difficult to achieve system balance in zoning. The building height of a building is 132m. When the water supply system is partitioned,1~1layer is divided into low areas, and 12 ~ 26 layers are divided into high areas. The water tank in the low area is located on the 14 floor, the water supply height is 52m, and the hydrostatic pressure at the lowest water distribution point of sanitary ware reaches 520kPa. The water tank in the high area is located on the 30th floor, the water supply height reaches 75m, and the hydrostatic pressure at the water distribution point of the lowest sanitary ware reaches 750kPa. It far exceeds the design value (35 0~450kPa) and the limit recommended by the code (GBJ 15- 88) (not more than 600kPa), which leads to splashing when water is used, and the connecting hose of sanitary ware often bursts, which reduces the comfort of use and also brings security risks.

4, the most unfavorable water supply point hydrostatic pressure

The most unfavorable water supply point is the highest point in the water supply system, and the hydrostatic pressure of water supply is low. Due to the consideration of building structure and cost, the setting of high-level water tanks in high areas is generally not too high, which leads to the low pressure of the most unfavorable water supply points in high areas, and its hydrostatic pressure is mostly below 100kPa, so it is often impossible to open or close when using delay self-closing flushing valves. In the frequency conversion water supply system with air pressure tank, the hydrostatic pressure at the most unfavorable water supply point is easy to increase, but the hydrostatic pressure at the lowest point after boosting is too high.