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How to consolidate the anti-corrosion plan for Ductile Iron Pipes today

2019-05-22

How to consolidate the anti-corrosion plan for Ductile Iron Pipes today


How to consolidate the anti-corrosion program of Ductile Iron Pipe today is directly related to the long-term use and safety of the pipe, so it is an important policy to measure the skill and operation of the pipe network. The presence of graphite in cast iron and SPHEROIDAL graphite in nodular cast iron does not affect the mechanical and mechanical properties of the Matrix material, but the static leakage rate of urban water supply network in China reaches 12 ~ 13% according to the investigation results in 10 typical cities It is far beyond the national standard to control the leakage rate of less than 6% in the city, so pipeline corrosion protection has been a hot topic for us at that time In 1984, the British Water Research Centre concluded that the zinc coating of ductile iron pipes was important in reducing corrosion. It is necessary to increase the density of zinc layer to 200g / m2 in order to strengthen the external anticorrosion ability of pipeline. For Ductile Iron Pipes, the zinc-asphalted outer coating is by far the best and most basic protection material. For Piping in highly corrosive areas, extra protection can be obtained by applying a polyethylene sheath, polyurethane coating, or polyethylene coating on top of a protective substrate.

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