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  • Hot dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot dip galvanizing is to first pickling the iron and steel parts. In order to remove the iron oxide on the surface of the iron and steel parts, after pickling, it is cleaned in the tank of ammonium chloride or zinc chloride aqueous solution or mixed aqueous solution of ammonium chloride and zinc chloride, and then sent into the hot dip plating tank. Hot dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

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  • A shallow manhole may have less than the standard depth, making it easier and quicker to access but potentially limiting the space available for workers and equipment. Shallow manholes may be used in cases where the underground infrastructure does not require a deeper access point or when construction or space constraints make it impractical to build a deeper manhole.

  • The primary function of stop tap water surface boxes is to act as an interface between the water supply system and the end-users. They facilitate the quick interruption of water service to specific areas, which is essential for


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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.

  • 3. Aesthetic Appeal Beyond their practical applications, metal gully drain covers also offer aesthetic benefits. Available in various designs and finishes, they can be integrated seamlessly into urban landscapes, contributing to the overall visual appeal of public spaces. These covers can be customized to suit specific architectural themes, enhancing the uniformity and style of the surroundings.