Waterproof casing pipe corrosion will reduce the capacity of water transmission, higher electricity consumption, waterproof casing pipe within the "growth ring" thickening year by year, not only affect the quality of water supply, but also seriously affect the original waterproof casing pipe water cross-section, reduce the capacity of water transmission, but also make waterproof casing pipe resistance increases, and cause a drop in water pressure. In order to ensure the water pressure of the water supply service, high head pumps must be used to increase the water pressure, which not only wastes electricity, but also increases the amount of water leakage. So reasonable spraying of rustproof paint and regular inspection are very necessary.
