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underground pressure

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  • Underground coal gasification — (UCG) is an in situ gasification process carried out in non mined coal seams using injection and production wells drilled from the surface, which enables the coal to be converted into product gas. The process is flexible in operation and is… …   Wikipedia

  • Underground stem — Underground stems are modified plant structures that derive from stem tissue but exist under the soil surface. Plants have two axes of growth, which can be best seen from seed germination and growth. Seedlings develop two structures or axes of… …   Wikipedia

  • Underground nuclear testing — Preparation for an underground nuclear test at the Nevada Test Site in the 1990s. Nuclear weapons …   Wikipedia

  • Underground mining (hard rock) — A three dimensional model of an underground mine with shaft access Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals[1] such as ore containing gold …   Wikipedia

  • Underground Electric Railways Company — The Underground Electric Railways Company of London Limited (UERL) was the holding company for three of the new deep level tube underground railway lines constructed in London in the first decade of the 20th century. It was established in 1902 by …   Wikipedia

  • Underground mining methods —   A drift mine is driven horizontally into coal that is exposed or accessible in a hillside. In a hydraulic mine, high pressure water jets break the coal from a steeply inclined, thick coalbed that would be difficult to mine with the usual… …   Energy terms

  • tunnels and underground excavations — ▪ engineering Introduction        Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …   Universalium

  • Seattle Underground — The Seattle Underground is a network of underground passageways and basements in downtown Seattle, Washington, United States that was ground level at the city s origin in the mid 1800s. After the streets were elevated, these spaces eventually… …   Wikipedia

  • Ten Ton Pressure — Infobox Album Name = Ten Ton Pressure Type = EP Artist = Chemlab Released = 1990 Recorded = National Geographic s studios Genre = Industrial rock Length = ??:?? Label = Fifth Colvmn Records Producer = ??? Reviews = | Last album = This album = Ten …   Wikipedia

  • Marc Eckō's Getting Up: Contents Under Pressure — Developer(s) The Collective, Inc. Publisher(s) Atari …   Wikipedia

  • Reduced pressure zone device — A Reduced Pressure Zone Device (RPZD, RPZ or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. An RPZD is considered suitable for high hazard applications, that is, where the consequence of… …   Wikipedia

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