Iron manhole covers. Cast iron sewer covers

Cast iron manholes - structures used for access to various underground utilities. Their main task is to protect the drainage system, pipeline, or well from damage and, of course, to ensure the safety of people and vehicles. Equipped with a locking device, cast iron sewer manholes also protect underground engineering utilities from unauthorized access by people, animals, and atmospheric precipitation.Complete set includes: cover and body. Sewer manholes are most often made from materials such as cast iron and polymer materials.Cast iron sewer manholes are the most common type of manholes. Since these manholes have a high degree of strength, their area of application is not limited.Manholes are divided into light and heavy types.Heavy manholes are high-strength products designed to protect pipelines and other structures at industrial facilities and in areas with heavy traffic. The undeniable advantages of heavy manholes are their versatility and durability. A significant drawback is their large weight, which makes working with them inconvenient.Light cast iron manholes (type L) are distinguished by their lightweight construction. Therefore, working with them is much more convenient, but due to the lightweight construction, such manholes are not as strong, so their area of application is limited. They can only be installed in green and pedestrian areas.Many cast iron manholes are equipped with a design that includes special locks that cannot be opened without a special tool. This is a kind of protective factor that prevents unauthorized access to the sewer system. Another protective factor is the round shape of the manhole, as its cover will not fall into the well.The drawbacks of all cast iron manholes include susceptibility to corrosion, freezing to the frame in winter, heavy weight, and attractiveness to those who like to sell black metal to scrap yards.