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2. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   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]

3. ISO 15398 - Wikipedia

   en.wikipedia.org/wiki/ISO_15398

   The ISO-standard ISO 15398 regulates the minimum requirements, proofs of suitability and auditing standards for manhole covers made of thermoplastics. The complete title of the norm is Specification for thermoplastics covers and frames for manholes and inspection chambers used in non-traffic areas. Issue date: 1. December 2012. The norm is in ...

4. 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 ...

5. Manhole - Wikipedia

   en.wikipedia.org/wiki/Manhole

   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 ...

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. Every state's nickname and where it comes from - AOL

   www.aol.com/every-states-nickname-where-comes...

   California: Golden State. This state nickname dates back to the California Gold Rush, which began in January 1848 with the discovery of the precious metal at Sutter's Mill.