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Larger primary devices (and transitions) that do not readily fit into a standard 4 ft (1.2 m) precast manhole barrel, either a larger barrel or a concrete vault must be used which adds cost. Packaged metering manholes, on the other hand, can integrate primary devices that are larger than the manhole barrel – with any portion that doesn't fit ...
The theft of manhole covers often increases when scrap metal prices are high. [18] [19] Manhole cover theft can be a serious problem in China, where missing manhole covers caused at least eight deaths in 2004. [20] According to China's Xinhua News Agency, about "240,000 manhole and street-drain covers were stolen in Beijing in 2004." [21]
A sanitary manhole under construction. A sanitary manhole (sewer manhole, [1] sanitary sewer manhole [2] or sewer maintenance hole [3]) is a manhole that is used as an access point for maintenance and inspection of an underground sanitary sewer system. Sanitary manholes are sometimes used as vents to prevent the buildup of pressurized sewage ...
A manhole cover for a sanitary sewer access point. View looking down into an open manhole showing two converging sanitary sewer lines. The larger line enters from the right and changes direction within the manhole to exit from the top of the photo. A smaller line enters from the bottom of the photo under the access steps.
The location of a sewer manhole must be carefully considered to ensure that the drainage system is effective and easy to maintain. [15] [16] According to design standards, the distance between two manholes is typically between 7 and 20 meters, depending on the specific characteristics of the project.
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
Docking sleeve (or mounting boss), a tube or enclosure used to couple two mechanical components together; Mortise and tenon, traditional method for connecting two pieces of wood; Chamfer, a transitional straight edge between two faces of an object; Fillet, a rounding of an interior or exterior corner between two faces of an object
Military use of a tank container system. Swap body tank - a swap body has a bigger tank which is larger than the frame, usually 23 or 25 feet (7.01 or 7.62 meters) long; Food-grade tank - a standard tank container which can only be loaded with foodgrade products; Reefer tank - a tank with the ability to cool ("refigerate") the product to be ...