Drainage knowledge of Chongqing Water Group 1. What is the common sense of water supply and drainage engineering installation?

(2) Water supply mode and characteristics 1) Direct water supply mode The direct water supply mode is that the indoor water supply pipe network is directly connected with the external water supply pipe network, and water is supplied by external water pressure.

It is suitable for single-storey and multi-storey buildings where external water pressure and water quantity can often meet the water demand and there is no special requirement for indoor water supply. This water supply mode is characterized by reliable water supply, simple system, less investment, simple installation and maintenance, full use of external water pressure and energy saving.

However, there is no water storage equipment inside, and the water will be cut off immediately if the water is cut off from the external network. When the water quality, water quantity and water pressure of the outdoor water supply network can meet the internal water demand of the building, this water supply mode should be considered first.

When the water pressure of the external pipe network can't meet the water demand of the whole building, the indoor pipe network can adopt the water supply mode of partition, the low-area pipe network adopts the direct water supply mode, and the high-area pipe network adopts other water supply modes. 2) Single-tank water supply mode The single-tank water supply mode is that the indoor pipe network is directly connected with the external network, and the external network pressure is used to supply water, and a high-level water tank is set to adjust the flow and pressure.

It is suitable for buildings with insufficient periodicity of external water pressure, stable indoor water pressure and high water tank. This method has the advantages of reliable water supply, simple system, less investment, simple installation and maintenance, full use of external water pressure and energy saving.

Set a high water tank to increase the structural load. If the water tank capacity is insufficient, the water supply may be stopped. 3) Set the water supply mode of water storage tank and water pump. The water supply mode of the water storage tank and the water pump is that the outdoor pipe network supplies water to the water storage tank, and the water in the water storage tank is pumped by the water pump to all water points in the indoor pipe network.

It is suitable for buildings where the water outside the network meets the indoor requirements and the water pressure is insufficient most of the time. When the indoor water consumption is even in one day, you can choose a constant speed pump; When the water consumption is uneven, it is appropriate to use variable frequency speed regulating pump to make the pump run under efficient working conditions.

This water supply method is safe and reliable, without high-level water tank and without increasing the load of building structure. However, the external water pressure is not fully utilized.

In order to provide safe water supply, water storage tanks and centralized pump rooms have been set up in the building communities of many cities in China, and water supply is carried out regularly or all day, which is also the way. 4) Water supply mode of water pump and water tank: The water supply mode of water pump and water tank is that the water pump pumps water from the water storage tank to pressurize, and the high-level water tank is used to adjust the flow rate, which can also directly supply water when the water pressure in the external network is high.

It is suitable for buildings where external water pressure is often or intermittently insufficient, allowing high-level water tanks. The set water tank stores a certain amount of water, which can delay the water supply when the water supply and power failure are stopped, and the water supply is reliable, which can make full use of the external water pressure and save energy.

Installation and maintenance are troublesome and the investment is large; There is water pump vibration and noise interference; A high water tank is needed to increase the structural load. 5) Vertical zoning water supply mode For buildings with many floors, when the water pressure of the outdoor water supply pipe network cannot meet the indoor water demand, vertical zoning can be carried out.

The water supply modes used in each district are as follows: ① Direct water supply in low area, and water supply mode with water storage tank, water pump and water tank in low area. This water supply method is that the low area is directly connected to the external network, and the water supply is directly based on the water pressure of the external network. The low area is lifted by a water pump, and the water tank regulates the flow. Suitable for buildings where external water pressure is often insufficient and direct pumping is not allowed, and high-level water tanks are allowed.

When it is difficult to supply water to the low area due to the seasonal shortage of external water pressure, the pipes in the high and low areas can be connected, and a valve is usually set to cut off. When the water pressure is low, the valve opens to supply water from the water tank to the low area. Pool and water tank store a certain amount of water, which can delay water supply at high places when water and electricity are cut off, and the water supply is reliable.

A part of external water pressure can be used, and the energy consumption is low. Trouble in installation and maintenance, large investment, vibration and noise interference of water pump.

(2) The water tank and water pump are set up in the partition parallel water supply mode, and the water pump is arranged centrally (generally located in the basement). It is suitable for all kinds of high-rise buildings that allow water tanks to be set in different areas, and is widely used.

The independent operation of each district does not interfere with each other, the water supply is reliable, the centralized arrangement of pumps is convenient for maintenance and management, and the energy consumption is small. Many pipelines are consumed, many kinds of pumps are used, and the investment is high. The water tank is on the upper floor of the building.

The water pump should use multistage pumps of the same model and different stages. If possible, in low areas, water should be supplied directly by external water pressure. (3) Parallel direct water supply mode: set variable speed pumps or multiple parallel pumps in different areas to pump water from the water storage tank.

According to the water quantity or water pressure, adjust the pump speed or the number of running units. Suitable for all kinds of high-rise buildings.

This water supply mode is reliable, centralized in equipment layout, convenient in maintenance and management, does not occupy the upper floor of the building and consumes less energy. There are many kinds and quantities of pumps with high investment, so it is necessary to set up pump control and regulation devices.

(4) Air pressure water tanks are connected in parallel for water supply. Pumps are used in all districts to pump water from the water storage tank for pressurization, and the pneumatic water tank is used to adjust the water pressure and control the operation of the pump. As shown in figure 5. 1.8.

Suitable for buildings that are not suitable for setting high-level water tanks. The advantages of air pressure water tank water supply mode are good water quality and sanitary conditions, and the water supply pressure can be adjusted within a certain range.

However, the regulating capacity of pneumatic water tank is small, the pump is frequently started, and the pump works in a variable pressure state, with low average efficiency, high energy consumption, high operating cost and large water pressure variation range, which adversely affects the use of building water supply fittings. ⑤ The water tank and the water pump are arranged in different areas in series, and the water pump is distributed, pumping water from the lower water tank for the upper level.

Suitable for high-rise buildings (such as high-rise industrial buildings) that allow water tanks and pumps to be located in different areas. This water supply method has the advantages of short total pipeline, less investment and less energy consumption.

But the independence of water supply is poor, and the upper area is limited by the lower area; Water pumps are scattered, which makes management and maintenance inconvenient; The water pump is located on the floor of the building, and the noise interference caused by vibration is great; The water pump and water tank are located on the floor, occupying the building area. ⑥ Partition water tank decompression water supply mode The water tank is set in different regions, the water pump is pressurized evenly, and the water tank is used for decompression, so that the upper area supplies water to the lower area.

Suitable for high-rise buildings with water tanks, sufficient power supply and low electricity price in various communities. This water supply method has fewer pumps and convenient maintenance and management; The decompression water tanks in each partition are small in size and occupy less land.

The water supply in the lower area is limited by the upper area, which consumes a lot of energy. The water tank on the roof has a large volume, which increases the load of the building.

If possible, the lower floor should be directly supplied with water by external water pressure. It is best to install a pressure reducing valve on the inlet pipe of the intermediate water tank to prevent the ball valve from being damaged and slow down the water hammer. ⑦ Divisional pressure reducing valve unified pressure reducing water supply mode and water pump.

2. What kind of enterprise is Chongqing Water Group?

Chongqing Water Group is one of the eight investment groups established by Chongqing * * *, and it was listed on 20 10 as a whole.

The main business of Water Group in Chongqing includes water supply and sales, sewage treatment, public works construction and supervision. Among them, sewage treatment covers domestic sewage treatment in the main city, eastern Chongqing and western Chongqing, and industrial sewage treatment in Xiyong Industrial Park, Liangjiang New Area and Changshou Economic Development Zone. The business scope has been continuously expanded on the basis of the national debt project, and the cooperation field has been continuously strengthened in the marriage project with Sino-French water affairs.

20 12 Chongqing * * * integrates water group and water investment group to form Chongqing water assets company, which will integrate the water supply and drainage markets of the two groups and enhance the strength of Chongqing water in domestic and foreign markets.