Manhole Covers and Frames A manhole, also known as an Inspection Chamber is a vital component of the water supply and sanitary system that is constructed underground to provide access to underground utilities like the sewer system and the drainage system. Manhole Covers The main purpose of constructing Manhole Covers and Frames is to provide access to the underground systems for cleaning, modifying, repairing, and inspection works. Meanwhile, you need to consider the strength requirement before purchasing a Manhole Cover for a particular application. Manhole Cover and Frame Manhole covers are made out of cast iron. Cast iron means the iron that is melted and then poured, or cast, into a mold. Typical manhole covers are made using gray cast iron. Ductile cast iron, because of its greater strength, is used for special manhole covers. Besides iron, the most essential raw material required to make manhole covers is RCC Concrete. Concre...
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