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  2. Nominal Pipe Size - Wikipedia

    en.wikipedia.org/wiki/Nominal_Pipe_Size

    Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. [1] " Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside ...

  3. List of New York City manhole cover abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_City...

    Download as PDF; Printable version; In other projects ... This is a list of manhole cover markings found in ... This page was last edited on 5 December 2024, at 18:10 ...

  4. Sanitary manhole - Wikipedia

    en.wikipedia.org/wiki/Sanitary_manhole

    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 ...

  5. Manhole - Wikipedia

    en.wikipedia.org/wiki/Manhole

    A manhole (utility hole, maintenance hole, [1] or sewer hole) is an opening to a confined space such as a shaft, utility vault, or large vessel. Manholes, typically protected by a manhole cover , are often used as an access point for an underground public utility , allowing inspection, maintenance, and system upgrades.

  6. Manhole cover - Wikipedia

    en.wikipedia.org/wiki/Manhole_cover

    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.

  7. Sewerage - Wikipedia

    en.wikipedia.org/wiki/Sewerage

    When a structure is so severely corroded that human entry is a risk, spinning head application permits an “un-manned” consolidation of the manhole. High pressure dry spray: this method, also called “ shotcrete ” or “gunite” is allowing a faster rate of rehabilitation, and also to make a thicker application in a single pass.

  8. Shaft (civil engineering) - Wikipedia

    en.wikipedia.org/wiki/Shaft_(civil_engineering)

    The use of segmental lining installed by underpinning or caisson sunk to form a circular shaft; Incremental excavation with a shotcrete circular or elliptical lining; Incremental excavation supported by shotcrete, rock bolts, cable anchors and steel sets or ribs; Shafts can be sunk either dry or for methods such as the caisson method they can ...

  9. Gravity sewer - Wikipedia

    en.wikipedia.org/wiki/Gravity_sewer

    Gravity sewer flow as seen looking down into an open sanitary manhole. A gravity sewer is a conduit utilizing the energy resulting from a difference in elevation to remove unwanted water. The term sewer implies removal of sewage or surface runoff rather than water intended for use; [ 1 ] and the term gravity excludes water movement induced ...

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