【 Weak current College 】 supply materials and equipment for water quality impacts and solutions (2)

2 prevent pipe and equipment contaminated by countermeasures
The popularization and application of new pipes 2.1 as technology advances, new pipe constantly innovation.
The influence of the pipe diameter is small, with smooth surface, makes water capacity increase 8%-10%, while for friction reduction, reduces the energy consumption of 6% to 8%, with the disadvantage that the price a little high. Because it is used in the pipe wall, the climate impact of the curing process is small. Zhuhai water Division currently mostly use non-toxic paint as internal coating in drinking water.
When using drinking water paints concern is the impact of water quality of coatings, the domestic more use of non-toxic epoxy coating for drinking water.
Regardless of anti-corrosion Coatings, should pay attention to the corrosion of the tubes, and should use the same paint.
2.2.2 pipeline anti-corrosion pipeline equipment equipment mainly for valve, the valve preservation requirements:
1, valve cavity are mixed with epoxy powder coating, coating thickness ≥ 200 μ m. the maintenance of large diameter valves cavity using epoxy resin coating, coating thickness ≥ 125 μ m. spraying must be carried out on metal surface by shot peening process to nearly white level (Sa2 level), and having not more than 4 hours heating spraying.
2. install the valve in the wild, the external surface in the outer surface of the epoxy coating should apply a layer of acrylic UV coatings.
3. all the valve must be in before coating for degreasing, sandblasted.
2.3 strengthen pipe and coating material detection in high-volume selection a pipe or corrosion-resistant materials, be entrusted with monitoring the water quality for immersion in water quality analysis after water, if there are multiple detection chromatogram of certain elements, this would not be appropriate for the pipe and coating materials.
2.4 backflow device selection to prevent backflow induced secondary pollution secondary pollution is a more difficult to solve the problem, the chances of it happening, point faceted wide, not easy to control. Recent drinking water contamination problems are common on the newspapers. Secondary pollution of common features, non-drinking water and drinking water of inert pollution occurred. At present, China's general use ordinary check valve to prevent backflow of water, but use, and to this end, some manufacturers developed a backflow device, it is in no condition to prevent reverse flow of medium in the pipeline, to achieve the purpose of avoiding backflow contamination, secondary pollution prevention network.
Therefore GB50015 — 2003 the building drainage design code detail backflow device installation locations. It also describes the backflow device and check the difference (check just boot the one-way flow of water flow valve, not prevent backflow contamination of valid device). Seriously implement GB50015 — 2003 specification is to prevent secondary contamination of effective approaches.
2.5 accelerate the pace of the old network of technical and economic reasons, previously part of the pipeline is laid without internal coating, lead pipe wall scaling, individual rotten perforation, serious impact on water quality. With the development of urban construction, the old city of opportunity, a condition excavation areas, to abolish the old pipe laying new tube; unconditional excavation of area, use the no-dig renovation technology. No-dig renovation technology methods, including composite hose Flip method and reducing HDPE pipe insertion method to repair old pipeline technology is more suitable. At the same time should actively promote the non-impact on water quality in the anti-corrosion Coatings include paints, epoxy series fluorocarbon coating, etc.
2.6 pipeline flushing water plant of the factory water is treated, but not pure water, it still contains some inorganic, organic matter and microbial. Any material of pipes, the water flow inthe network will appear during pipeline scaling. Therefore, should be based on a rinsing pipe network.
Pipeline flush mainly use fire hydrant and sewage valve. Fire hydrant for fire prevention and building. From the supervisor to fire hydrants are generally around 5 ~ 10m pipeline, while the water more tube into "dead water" impact on water quality. To solve this problem you must regularly discharge fire hydrant, generally every half year for fire hydrants must be discharged at a time, and, where appropriate, draw up a provisional emission measures (such as the Division I in salty period on network a comprehensive sewage). For network peripheral, residents set community and users complain of poor water quality, in addition to additional sewage valve, but also by constantly explore and practice, develop appropriate washing intervals. On the network for washing should be one-way washing, rinsing, end valve closes, the one-way to water, and then close the other end of the valve, flush the other segment. This washing effect is better. The water supply pipeline for maintenance of water pollution should as appropriate give due after repaired flushing; for a new installation of pipelines and networks, you must carefully and washing and disinfection.
3 conclusion
Prevention of secondary pollution, improvement of water is the main measures to improve water quality in the factory premise to accelerate the pace of urban renovation of the old pipe network to promote the application of new pipes, in accordance with the required equipment and pipeline of internal and external corrosion protection, strengthening the network of irrigation and by GB50015-2003 the building drainage design code requires a backflow device.