The corrosion of well pipes in groundwater systems is primarily addressed through two main approaches. First, enhancing the corrosion resistance of the piping materials by using high-quality, durable substances. Second, eliminating or reducing the factors that contribute to corrosion. Below are some common anti-corrosion strategies that can be implemented:
1. Selecting high-quality materials with excellent corrosion resistance is crucial. This includes using bolts and copper cables that significantly extend the lifespan of the system. It's important that the same type of metal used has a smooth surface, free from roughness, and should be annealed rather than hardened. Welds at stress concentration points are more susceptible to corrosion and should be avoided during manufacturing and installation.
2. Applying a protective coating or plating on the pipe surfaces offers several benefits. These coatings provide electrical insulation, maintain integrity and durability, and have good adhesion and strength. They should also be non-toxic and cost-effective, making them ideal for long-term use in underground environments.
3. Replacing traditional connection screws with stainless steel or galvanized alternatives can improve resistance to corrosion. It’s recommended to inspect and replace the wellhead annually. Additionally, wire ropes should be lubricated or encased in plastic tubes to prevent degradation from moisture and mechanical stress.
4. In areas prone to heavy calcium carbonate buildup, especially during periods of heavy rainfall, it's essential to implement measures that reduce hydraulic shocks in water supply wells. This can be achieved by lowering the intake velocity, increasing the filter diameter, and expanding the water intake area. When pumping, using smaller pumps and filling the upper gravel layer with appropriately sized material can further enhance system efficiency and longevity.
By combining these methods, the overall performance and service life of well piping systems can be significantly improved, ensuring reliable and sustainable groundwater extraction over time.
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