Chongqing water group drainage company

1. drainage knowledge of Chongqing water group

drainage knowledge of Chongqing water group 1. what is the common knowledge 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 the water is supplied by external water pressure.

it is suitable for single-storey and multi-storey buildings with external water pressure and water quantity that can often meet the water demand, and indoor water supply has no special requirements. This water supply mode is characterized by reliable water supply, simple system, low investment, simple installation and maintenance, which can make full use of external water pressure and save energy.

however, there is no water storage device inside, so the water inside will be cut off immediately when the external network is cut off. 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 method 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) Water supply mode of single water tank The water supply mode of single water tank is that the indoor pipe network is directly connected with the external network, and the external network pressure is used to supply water, and at the same time, 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, indoor water pressure stability and high water tank. This method has the advantages of reliable water supply, simple system, less investment, simple installation and maintenance, and can make full use of external water pressure and save energy.

set up a high-level water tank to increase the structural load. if the water tank is insufficient, it may cause water cut-off. 3) Water supply mode of water storage tank and water pump is set. The water supply mode of water storage tank and water pump is that 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 external water supply 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 advisable to use variable frequency speed regulating pump to make the pump run under efficient working conditions.

this water supply method is safe and reliable, and there is no high-level water tank, which does not increase the load of the building structure. However, the water pressure of the external network is not fully utilized.

in order to provide safe water supply, water storage tanks and centralized pump rooms are set up in the residential areas of many cities in China at present, and water supply is carried out regularly or all day, which is also adopted in this residential area. 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 storage tank to pressurize, and the high-level water tank is used to adjust the flow, which can also directly supply water when the water pressure in the external network is high.

it is suitable for buildings where the external water pressure is often or intermittently insufficient, and high-level water tanks are allowed. The set water tank stores a certain amount of water, which can delay water supply when water supply and power failure are stopped, and the water supply is reliable, which can make full use of the external network 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-level water tank is needed to increase the structural load. 5) Vertical partition water supply mode For buildings with many floors, when the water pressure of outdoor water supply network can not meet the indoor water demand, it can be vertically partitioned.

the water supply modes adopted by each district are as follows: ① direct water supply in the low area, and water supply mode with water storage tank, water pump and water tank in the low area. This water supply mode is that the low area is directly connected with the external network, and the water is directly supplied by the water pressure of the external network, and the low area is lifted by the water pump, and the water tank adjusts the flow. It is suitable for buildings where the 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 water pressure in the external network, the pipes in the high and low areas can be connected, and a valve is set to cut off at ordinary times. When the water pressure is low, the valve is opened to supply water to the low area from the water tank. A certain amount of water is stored in the pool and water tank, and water supply can be delayed in high areas when water and power are cut off, so the water supply is reliable.

partial external water pressure can be used, with less energy consumption. Installation and maintenance are troublesome, with large investment, and water pump vibration and noise interference.

(2) Water tank and water pump are set up in zones in parallel water supply mode, and the water pump is arranged centrally (generally 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. More pipes are consumed, more types of pumps are used, and the investment is high. The water tank occupies the upper floor of the building.

multi-stage pumps of the same model and different stages should be used for water pumps. If possible, water should be directly supplied by external network water pressure in low areas. (3) Parallel direct water supply mode: variable speed water pumps or multiple parallel water pumps are set in different zones to pump water from the storage tank.

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

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

(4) parallel water supply mode of air pressure water tank. Pumps are used in all districts to pump water from the storage tank, and the air pressure water tank is used to adjust the water pressure and control the pump operation. As shown in figure 5.1.8.

it is suitable for buildings where high-level water tanks are not suitable. 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 regulated storage capacity of the pneumatic water tank is small, the water pump is frequently started, and the water pump works under variable pressure, which has low average efficiency, high energy consumption, high operating cost and large water pressure variation, which has adverse effects on the use of water supply fittings in buildings. ⑤ Water tanks and pumps are arranged in series in different zones, and the pumps are distributed, pumping water from the water tanks in the lower zone for the upper zone.

it is suitable for high-rise buildings (such as high-rise industrial buildings) where water tanks and pumps are allowed to be set in different areas. This water supply method has the advantages of short total pipeline, less investment and less energy consumption.

However, 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 Water tanks are set in different regions, and the pumps are pressurized uniformly, and the water tank is used for decompression, so that the upper region can supply water for the lower region.

it is suitable for all kinds of high-rise buildings that allow water tanks to be set in different districts, with sufficient power supply and low electricity price. This water supply method has fewer pumps and convenient maintenance and management; The volume of decompression water tanks in each partition is small, occupying less construction area.

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, and 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. All landowners partition pressure reducing valve decompression water supply mode water pump unified.

2. What kind of enterprise is Chongqing Water Group

Chongqing Water Group is one of the eight investment groups built by Chongqing * * *, and it was listed on the whole in 21.

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

In 212, Chongqing * * * integrated the Water Group and the 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 the domestic and international markets.