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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.
EEICo. = Edison Electric Illuminating Company; FDNY = FDNY; GAS = Brooklyn Union Gas; HPFS = High Pressure Fire Service; IRT = Interborough Rapid Transit; JWS = Jamaica Water Supply Company of New York; KCEL&PC = Kings County Electric Light and Power Company; KCR Co. = Kings County Refrigerating Co. [Gansevoort Market area] LIC = Long Island City
A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.
An open utility vault. "ELEC" on cover indicates electrical equipment/wires. A utility vault is an underground room providing access to subterranean public utility equipment, such as valves for water or natural gas pipes, or switchgear for electrical or telecommunications equipment.
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 covers in Helsinki, Finland. 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 ...
Orangeburg pipe was made of wood pulp sealed with liquified coal tar pitch in inside diameters from 2 inches to 18 inches, with a perforated version for leach fields. . Joints were made of the same material, and, because of the residual stickiness of the coal tar, were sealed without adh
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 ...
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