Is there a charge for secondary water supply in the community?

Secondary water supply is generally charged, and the specific charging standards are different. Generally, the secondary water supply fee will not be set separately, but will be charged when paying the water fee or property fee. Please tell me the specific situation of the residential property. The price of secondary water supply includes the daily operation, cleaning and disinfection, water quality testing, maintenance and management of secondary water supply facilities.

What floor is the secondary water supply above?

Generally speaking, municipal direct water supply is used for floors below 4-6, and fully automatic secondary water supply equipment is used for the above parts. However, some people directly use pressurization equipment from the first floor, depending on the local municipal pressure. According to the relevant regulations, the water supply pressure of the water supply company can only reach the sixth floor, which is far from meeting the needs of high-rise buildings.

Where municipal water pressure cannot be delivered, it must be pressurized twice, which is called secondary water supply. There are two standards for municipal water pressure. One is that the national regulations meet the service head of 28m (six floors); The other is 14m head (three floors) as stipulated in Document No.277 of the Ministry of Construction. Due to different topography, the most unfavorable water pressure for water supply in local waterworks can't reach 28m head, so the head should not be less than 14m. General municipal water supply is responsible for supplying water to 1-6 floors, and secondary pressurized water supply starts from the 4th or 7th floors.

Working principle of secondary water supply

Secondary water supply is only a pressurization method when the pressure of its own water source cannot transport water to its destination. The most widely used secondary water supply should be high-rise building water supply. This kind of water supply is inseparable from the secondary pressurization of the water pump, but there are two fundamental differences in specific forms.

The first one is to pressurize the water to the roof water tank through the water pump, and then return it to the user by the self-weight pressure of the water in the water tank. This method is basically eliminated because the load requirement of the building and the sanitation of its own water tank are difficult to guarantee. The second way is frequency conversion transportation. This method controls the water flow by detecting the official website pressure of the effluent, and then adjusting the speed of the pump by frequency conversion to realize pressurized water supply. We often hear the same names as tower-less water supply, frequency conversion water supply and non-negative pressure water supply, and their basic principles are all like this. The only difference is the more specific control mode control form.