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Mixing galvanized and black iron pipes within the same system can present several challenges. One of the primary concerns is galvanic corrosion, a phenomenon that occurs when two dissimilar metals come into electrical contact in the presence of an electrolyte, such as water. In this scenario, the zinc coating of the galvanized pipe can corrode at an accelerated rate due to the electrical activity created by the differing materials. As a result, the lifespan of the system may be significantly reduced, leading to potential failures and costly repairs.
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These manhole covers are primarily made of ductile iron (SG iron) or nodular iron a unique form of iron. Depending on the nodularity, the quality of the iron is determined whether it is good or bad. Ductile iron covers are known for their solidness, strength, heavy-duty, and resilient features. Ductile iron will not corrode as quickly as cast iron, as the manhole cover manufactures spray anti-rust asphalt paint at the surface of the covers. The loading classes for ductile iron manhole covers are subjected to BS EN 124:2015 guidelines and are predominantly used over a D400 class.