Swimming pool water contains various levels of chemical residues, which can be corrosive. Therefore, the raw materials of the circulating water treatment pipeline of the swimming pool should have corrosion resistance. Therefore, the raw materials of the circulation pipeline should be ABS plastic pipes, chlorinated polyvinyl chloride (CPVC) plastic pipes, hard polyvinyl chloride plastic pipes and other special water supply plastic pipes. They all have the advantages of small water flow resistance, internal and external lubrication, low thermal conductivity, light raw materials, convenient construction, corrosion resistance and so on. However, it has the defects of poor anti-ultraviolet function and decreasing density with the increase of humidity. This paper mainly introduces the selection of circulating water treatment pipe in swimming pool and the diameter and flow of pipe planning according to the need.
Material selection of circulation pipeline
Swimming pool water is rich in varying degrees of chemical residues, which has certain corrosive properties. Therefore, the raw materials of the swimming pool circulating water treatment pipeline should be corrosion-resistant. The raw materials of circulating pipes should be ABS plastic pipes, chlorinated polyvinyl chloride (CPVC) plastic pipes, hard polyvinyl chloride plastic pipes and other special water supply plastic pipes.
The advantage analysis of different material pipeline
ABS plastic pipes, chlorinated polyvinyl chloride (CPVC) plastic pipe have the advantages of small water flow resistance, internal and external lubrication, low thermal conductivity, light raw materials, convenient construction, corrosion resistance and so on. However, its anti-ultraviolet function is poor, and its density decreases with the increase of humidity. ABS plastic pipe also has the advantages of high strength stiffness, impact resistance, good flexibility and so on. PVC-U plastic has poor wear resistance. In the planning and selection, the characteristics of the pipeline should be carefully analyzed. When the above pipes are selected for the water system, the pipes with a pressure grade of not less than 1 shall be resistant. Ompa nominal pressure rating should be selected.
When the pool plumbing selection has special requirements
When there are special requirements, such as when the inner wall of the swimming pool is lined with stainless steel plates, in order to make the connection between the two tight, stainless steel pipes can be selected. At present, the types of non-metallic pipes are rich, and the space for choice is large, and it is not appropriate to choose the pool circulating water treatment pipes of carbon steel raw materials with poor corrosion resistance and difficult construction.
Diameter and flow of pool circulation pipe
The circulating pump directly inhales the water from the bottom of the pool. In order to avoid the phenomenon of whirlpool water and excessive negative pressure inhalation at the bottom of the pool, the water at the bottom of the pool will be inhaled to swimmers, especially minor swimmers, causing accidental injury. The flow rate of the return pipe should be controlled at 0.7-1.0 m /s ratio. The overflow drain pipe of the parallel pool water circulation method (called the overflow return pipe when recycled) can calculate the diameter of the circulating water treatment circulation pipe of the swimming pool according to the gravity flow. The diameter of circulating water supply pipe and circulating water return pipe in swimming pool water treatment equipment should be determined according to different flow conditions and circulating water flowmeter.
The diameter of circulating water pipe is calculated according to the pressure flow rate. In order to adjust the water flow at the outlet of the pool, reduce the circulating pump head, and save the energy consumption of the circulating pump in the pool, the flow speed of the circulating distribution pipe should not be greater than 2.0m/s.
Pipeline countercurrent pool circulating water treatment
1. The return pipe connected to the overflow return water inlet is usually calculated according to the flow state of the gravity flow full pipe, and its slope should not be less than 0.003-0.005 slope balanced water can not balance the pool.
2. When the circulating water of the countercurrent swimming pool is treated, the overflow return water outlet is connected to the return pipe. If the overflow return water outlet is connected to the balance pool below the maximum high water surface, the pipe diameter of the return pipe should be determined according to the hydraulic analysis above the water level to calculate the gravity full pipe flow rate or the engulfing flow rate.
3. Because the return port of the countercurrent swimming pool circulating water treatment system is located in the overflow return water tank at the edge of the swimming pool, the tank is connected to the atmosphere, so the connection method of the overflow return pipe connected to the return port is not the same, and the actual flow rate of the return port is not the same. In some engineering test operation systems, the noise of trapped gas in the return port, this is because the flow resistance of the return port is small, and the practice of return is greater than the upstream return of the return water to the port, resulting in the surface of the return port can not form a phagotic water layer, and then by the gas water mixed flow, the surface of the return port shows the phagotic water layer.
4. Because it is far away from the return water main, the flow resistance increases, and the flow of the return water outlet can not be discharged in time. This indicates that there is a certain layer on the surface of the intake.
5. After reducing the effective cross section of the return port (which was random at that time and no test was conducted), the situation was improved, but not completely improved. Therefore, it is necessary to choose the noise reduction type or the flow adjustable type water return port in the actual project.
Measures to prevent the sound of water spraying in pipes
In some projects, due to conditions, the return water main is connected to the water surface of the balance pool, so that the air inhaled in the return water main can not be released in time, so that the return water outlet near the end of the return water main intermittently appears water column mixed with gas and water, accompanied by beeping sound. This caused shock and disturbance to the swimmers. In order to avoid this situation, the following methods should usually be used:
1. The return water outlet of the overflow return tank on both sides of the pool is separated from the connection of the respective return water pipe, and the return water pipe is separated from the balance pool, this method can still be done;
2. The end of the overflow return tank is provided with a return water pit, and a return water outlet is provided in the pit;
3, the respective return water pipeline should be as much as possible higher than the maximum high water level of the balance pool 300-400mm;
4, the pool of circulating water treatment return water inlet connection, such as the use of stroke connection, this is more difficult to achieve;
5. Select the noise return port with adjustable flow.