To prevent the nodular cast iron manhole cover from being eroded underground and extend the service life of the pipe network, the outer surface of the nodular cast iron manhole cover should be coated with a layer of asphalt paint, and then packed into the warehouse.

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A manhole cover or maintenance hole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe. It is designed to prevent anyone or anything from falling in, and to keep out unauthorized persons and material.

Manholes, which are increasingly termed maintenance holes, serve a useful purpose: they are the openings, or access points, that lead down to an underground public utility, such as a sewer or a drainage system. Engineers, laborers and inspectors use them for the purpose of inspecting, cleaning, repairing and maintaining utilities.

A  manhole cover is a removable lid that covers the manhole and prevents people and things from falling into it. A  manhole cover can be of different shapes like rectangular, square and circle. The most popular choice however is the circular manhole so commonly seen everywhere. Manholes are usually circular and it logically follows to have a circular manhole cover. Circular  manhole covers are safe because they will not fall into the manhole where workers may be present.

Have you ever wondered: “what is a manhole cover?” A manhole cover is a removable plate used to close off an opening to a confined space such as a sewer, utility access point, or storm drain. They are typically round or rectangular and drop into or sit atop an underlying frame or structure. Manhole covers are often made from cast iron, ductile iron, steel, concrete, composite materials, or plastic.

Manhole covers are round or square covering that is frequently found on the ground. It is a strong cover that fits over manhole openings and is built of materials like metal or concrete. These manholes serve as entrances to utility networks, sewer systems, and underground tunnels. A manhole cover's primary function is to act as a safe and protective barrier. It prevents people or items from accidentally falling into these underground regions. Additionally, it helps in keeping out water, animals, and debris, maintaining efficient operation. So, bear this in mind the next time you see a manhole covers Kolkata, it's vital to the safety and smooth operation of our city.

Manhole, as the name implies is an entry for maintenance personnel from the ground surface into the subterranean world of pipes, cables and utility lines. Installed out of sight, this underground labyrinth of pipes crisscrossing each other is the spine of our cities, keeping them clean and healthy. To keep it running and functioning day and night, regular maintenance and repairs is a must. The purpose of manholes is that every length of pipe is accessible for inspection and maintenance. 

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