In the water supply system of high-rise buildings in China, the use of high level toilet water tank system is more common.This is mainly because the high level toilet water tank feed system has the following advantages：

1. Can use cheap constant speed water pump, the working efficiency of the water pump is high

2. Simple management and maintenance, low technical requirements

3. Can store certain life and fire water, therefore, high level toilet water tank will become one of the basic water supply equipment for the water supply system of high-rise buildings

Water tank effective volume of the calculation of high-rise building water supply tank effective volume including tank maximum regulation volume, peak water volume, safe water volume, if for the life of the fire tank, the volume should also include the fire storage volume.There are two methods to calculate the effective volume of domestic water storage in water tank.
（1） High water storage volume of domestic water in high-rise hotel cistern.

（2） high level toilet water tank regulation volume can also be calculated by the water tank volume percentage method

Knowledge for water inlet pipe:

 The water inlet pipe of the water tank is generally connected from the side wall.You can also pick people up from the bottom or top. When the water tank USES the pressure of the pipe network to fill water, in order to prevent overflow, the outlet of water flow in the water inlet pipe shall be equipped with a level control valve or a ball float valve as far as possible. The control valve is connected to the water tank from the top. When the pipe diameter is 50mm, The number is generally no less than 2 hole. Check valve should be installed before each control valve. When the water tank USES the pressure of the pressurized pump to feed water and USES the water level to rise and fall automatically to control the pump operation, the water level control valve should not be installed.