System design of water supply pipes

The arrangement of the water supply pipeline network has two basic forms – branched and annular. In the first, the trunk and branches are distinct and form a dendritic shape; in the latter the pipes are connected vertically and horizontally to form a ring. The water supply piping network is formed by connecting many water pipes. Water piping materials can be divided into non-metallic pipes (reinforced concrete pipes, plastic pipes, glass fiber reinforced pipes, steel-plastic composite pipes, prestressed concrete pipes with steel sleeve, etc.) and metal pipes (cast iron pipes). pipes, ductile iron pipes, steel pipes, etc.). The diameter of each section of pipe is determined by both flow rate and flow rate. When the flow rate is constant, if the selected flow rate is large, the diameter of the pipeline will be small and the cost of the pipeline will be low. However, the flow rate will lead to a large pressure drop, which will increase the height of the water tower and the overload of the pump operation; conversely, if the selected flow rate is small, the pipe diameter will be large. Although the pressure drop and normal operating costs can be reduced, the cost of the pipeline will increase. . Therefore, it is necessary to make an economic comparison when determining the diameter of the pipe to minimize the total cost of water supply. The traditional method is to apply the economic scope and the modern method is to use the optimal design method. In order to ensure the normal operation of the water supply network, fire protection requirements and maintenance management, it is necessary to install the various necessary accessories on the pipe network, such as valves and hydrants in appropriate positions, drain valves at the highest points of the low pipes and tubes at the bottom of the tubes. Install a drain valve, etc. Various auxiliary structures are also present on the pipeline network, such as pipeline foundations, buttresses, valve shafts, inverted siphons, pipeline bridges, etc. To regulate the flow in the water supply pipeline network and reduce the construction and operating costs of the pipeline network, retrofitting facilities such as clear water pools, pressurized pumping stations, water towers and swimming pools are often set up of highlands. In the total investment of water supply projects, the water supply pipeline network accounts for more than 70% of the cost, so it is necessary to perform the calculation and comparison of various schemes to achieve the purpose of reducing investment, saving energy and ensuring water supply safety.

 


Post time: Apr-02-2022