|
Blowdown
Blowdown may refer to: * Windthrow or forest blowdown, a felling of trees by windstorm * Blowdown stack A blowdown stack is an elevated vent or vertical stack that is used to vent the pressure of components of a chemical, refinery or other plant if there is a process problem or emergency. A blowdown stack can be used to complement a flare stack or a ..., a vertical containment structure at a refinery or chemical plant * Boiler blowdown, a steam-boiler process to remove impurities * '' Blowdown'', a television series focusing on explosive demolition * accidental pressure loss in a nuclear reactor pressure vessel {{disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blowdown Stack
A blowdown stack is an elevated vent or vertical stack that is used to vent the pressure of components of a chemical, refinery or other plant if there is a process problem or emergency. A blowdown stack can be used to complement a flare stack or as an alternative. The purpose is to prevent 'loss of containment' of volatile liquids and gases. Blowdown from several systems may be combined in a blowdown header prior to the stack. A knock-out pot may be provided at the base of the stack to remove any liquids. Blowdown stacks may either be ignited (like a flare) or un-ignited (a ‘cold’ vent). The height of the blowdown stack must be tall enough to ensure the safe dispersal of vapour. Blowdown Blowdown is the controlled removal, safe flow and disposal of vapour from a pressure vessel. Blowdown, or depressurisation, removes hazardous inventory from a vessel, reduces the pressure in the vessel and thereby reduces the stresses in the vessel walls. Blowdown is used prior to draining ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Blowdown (TV Series)
Blowdown is an internationally broadcast documentary television series that follows a team of explosive demolition experts as they prepare and implode iconic, complex and challenging structures around the world. The series airs on National Geographic Channel International, History Television in Canada, DMAX in Germany and Five in the United Kingdom, and is produced by Parallax Film Productions Inc.. The hour-long shows focus on the dangers, challenges, and inside strategies of this type of demolition by documenting the work of a specialized explosives team: Controlled Demolition Incorporated of Phoenix, Maryland, USA. Using a combination of exclusive footage, high-concept visual effects and process-driven computer models, Blowdown explains the complex science behind CDI’s mission. The series highlights obstacles the team encounters as they rely on experience and intuition to reverse engineer structures designed to be indestructible. Episodes Season One 2008 Season One ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Windthrow
In forestry, windthrow refers to trees uprooted by wind. Breakage of the tree bole (trunk) instead of uprooting is called windsnap. Blowdown refers to both windthrow and windsnap. Causes Windthrow is common in all forested parts of the world that experience storms or high wind speeds. The risk of windthrow to a tree is related to the tree's size (height and diameter), the 'sail area' presented by its crown, the anchorage provided by its roots, its exposure to the wind, and the local wind climate. A common way of quantifying the risk of windthrow to a forest area is to model the probability or 'return time' of a wind speed that would damage those trees at that location. Another potential method is the detection of scattered windthrow based on satellite images. Tree senescence can also be a factor, where multiple factors contributing to the declining health of a tree reduce its anchorage and therefore increase its susceptibility to windthrow. The resulting damage can be a si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boiler Blowdown
Boiler blowdown is water intentionally wasted from a boiler to avoid concentration of impurities during continuing evaporation of steam. The water is blown out of the boiler with some force by steam pressure within the boiler. Bottom blowdown used with early boilers caused abrupt downward adjustment of boiler water level and was customarily expelled downward to avoid the safety hazard of showering hot water on nearby individuals. Background A steam boiler evaporates liquid water to form steam, or gaseous water, and requires frequent replenishment of boiler feedwater Boiler feedwater is an essential part of boiler operations. The feed water is put into the steam drum from a feed pump. In the steam drum the feed water is then turned into steam from the heat. After the steam is used it is then dumped to the m ... for the continuous production of steam required by most boiler applications. Water is a capable solvent, and will dissolve small amounts of solids from piping and con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Explosive Demolition
In the controlled demolition industry, building implosion is the strategic placing of explosive material and timing of its detonation so that a structure collapses on itself in a matter of seconds, minimizing the physical damage to its immediate surroundings. Despite its terminology, building implosion also includes the controlled demolition of other structures, such as bridges, smokestacks, towers, and tunnels. Building implosion, which reduces to seconds a process which could take months or years to achieve by other methods, typically occurs in urban areas and often involves large landmark structures. The actual use of the term "implosion" to refer to the destruction of a building is a misnomer. This had been stated of the destruction of 1515 Tower in West Palm Beach, Florida. "What happens is, you use explosive materials in critical structural connections to allow gravity to bring it down." Terminology The term ''building implosion'' can be misleading to laymen: The t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
