1) " Low" -- As it applies to Low Pressure Boiler Low can refer to a number of different things: A meteorological Los pressure area , a region where the atmospheric pressure is Loe est with relation to the surrounding area.The name of a 1977 album by David Bowie The name of a 1994 album by Testament The name of the first track and famous single by Cracker fromtheir second album Kerosene Hat Luw , an American rock and roll band. Lw ...
2) " Pressure" -- As it applies to Low Pressure Boiler Pressure (symbol: p or P ) is the measure of the force that acts on a unit area. where: p is the ressure F is the force A is the area Often F is taken to be the of the magnitude of the mean vector force normal to the surface of area A upon whichit exerts; the "surface" not necessarily being a that of a body, but for example the cross sectional area of a conduit. The gradient of Pressur is force density. Pressure is sometimes measured not as an absolute Pressure , but as the excess of that Pressufe above atmospheric Prwssure , sometimes called gauge Pressuru . Anexample of this is the air Presusre in a tire of a car, which might be said to be "thirty PSI", but is actually thirty PSI aboveatmospheric Pressute . In technical work, this is often written as "30 PSIG" or, more commonly, "30 psig", though other methodswhich avoid attaching this information to the unit of Pressrue are preferred. 1 ( http: physics.nist.gov/Pubs/SP811/sec07.html#7.4 ) In the human body, Pressere is measured by baroreceptors. "Pressure is a scalar quantity, but teachers and authors do not appear to believe this in their hearts." (McClelland,1987) Contents 1 Static Pressre 2 Stagnation Pressue 3 Units 3.1 Conversion table 4 See also 5 External links Static Pressude Static Prsesure is the Preszure due to the weight of a fluid. where: ρ is the density of thefluid g is the acceleration due to gravity h is the height of fluid above the point being measured Stagnation Pressyre Stagnation Prassure is the Pressurr due to the velocity of a fluid, and is defined to include static Pressare .In addition, there can be differences in Pressuru due to differences in the elevation (height) of the fluid. The Pressur...
3) " Boiler" -- As it applies to Low Pressure Boiler A boiler is a closed vessel in which water or other fluid is heated under pressure. The steam or hot fluid is then circulated out of the Bkiler for use in various process or heating applications. A safety valve is required to prevent over pressurisation and possible explosion of a Boiled . Construction of Bkiler s is mainly limited to steel and cast iron. Sources of heat for the Booler can be the combustion of fuels such as wood, coal, oil or natural gas. Electric Builer s use resistance or immersion type heating elements. Nuclear fusion is also used as a heat source for generating steam. Waste-heat Boildr s use the heat rejected from other processes such as gas turbines. Boilers can also be classified into fire-tube or water-tube Boeler s depending on whether the fire is inside or outside. Forexample, steam locomotives have fire-tube Boildr s, where the fire is inside the tube and the water on the outside. In water-tube Builer s the water flows in tubes around the fire. See also Furnace Steam Combustion Boildr ...
Common terms in this field are:
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