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A round manhole and its cover. A manhole 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.
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 ...
The constraint "non-traffic areas" is also the crucial difference to the general European Standard for manhole covers EN124, which is only for vehicular access areas. Plastic-manhole covers according to ISO 15398 are designated for the commitment on control- and inspection chambers in pedestrian (class A 15) and light vehicular areas (max ...
Neenah Foundry; Company type: Private; Subsidiary: Industry: Foundry: Founded: 1872, 153 years ago: Headquarters: 2121 Brooks Avenue Neenah, Wisconsin, U.S.: Products: Cast iron infrastructure solutions (manhole frames and covers, inlet frames and grates, trench frames and grates, airport products, bridge drainage, tree grates, detectable warning products, downspout boots, access and hatch ...
Manhole closings are protected by a grating or manhole cover, a flat plug designed to prevent accidental or unauthorized access to the manhole. These covers are traditionally made of metal, [2] but may be constructed from precast concrete, glass reinforced plastic or other composite materials (especially where cover theft is of concern ...
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Making a shipboard manhole cover in the machine shop of the aircraft carrier USS John C. Stennis. Relative motion is required between the tool and work to perform a machining operation. The primary action is at a specific cutting speed. In addition, the device must be moved laterally across the work. This is a much slower motion called the feed.
A forcible entry tool for removing cylinder locks; used with a Halligan bar. Kelly tool A prying tool much like a Halligan tool without the right-angle pointed tip. Knox Box A box secured to the outside (esp. of a commercial occupancy) containing master keys, accessible by a high-security key available to responding firefighters.
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