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  2. Sanitary manhole - Wikipedia

    en.wikipedia.org/wiki/Sanitary_manhole

    The purpose of the cone section is to reduce the openings from large chamber sizes to small cover sizes. In a masonry manhole, the bricks form a corbel inward to reduce the opening to a desired size. [14] In precast concrete, the cone section comes in two forms, concentric and eccentric. In a concentric cone section, the top opening is in the ...

  3. 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.

  4. 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.

  5. 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 ...

  6. 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 ...

  7. 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 New York City. ... 10 (UTC). Text is ...

  8. Pumping station - Wikipedia

    en.wikipedia.org/wiki/Pumping_station

    The pumping station may be called a lift station if the pump merely discharges into a nearby gravity manhole. [4] From here the cycle starts all over again until the sewage reaches its point of destination—usually a treatment plant. By this method, pumping stations are used to move waste to higher elevations.

  9. List of drill and tap sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_drill_and_tap_sizes

    Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.

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