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ine bad effects of accuracy. 2. Pipeline noise Noise and tremble are not generated by pipe itself but hydraulic shock, pipe resonance and pressure pulse. Here explain, combining operation and maintenance of fuel dispense, these reason for noise and tremble 2.1 Hydraulic collision Hydraulic collision refers to the phenomenon in which oil pressure in pipeline is increased quickly as pipe switch open or close or liquid changing flow direction. Hydraulic collision could lead to pipeline noise, which are result from piston changing direction of measurement transducer and witching on or off pipe valve. Δρ= 12lv11+EoE·dδ (v2=0,t≤T) (2-10) Δρ= 12lv11+EoE·dδ ·Tt (v2=0,t≤T) (2-11) Δρ= 12lv11+EoE·dδ ( partial v2?,t≤T) (2-12) Δρ= 12lv11+EoE·dδ ·Tt (partial v2?,t≤T) (2-13) In above formulae: Δρ── increasing pressure value; υ1── previous velocity of flow υ2── latter velocity of flow T ── time that start from collision to reflect T=2la T ── changing time of velocity of flow fromυtoυ2 E0 ── elastic volume of f fuel dispenser luid cubage E ── elastic modulus of pipeline d ── inner diameter of pipe δ── pipe thickness l ── diffused distance of shock wave a ── diffused speed of shock wave The above formulae illustrate four kinds of stock pressure on pipe in corresponding operations in which switching on or off noz fuel dispenser zle quickly or slowly. They also explain that slowly switch on and off nozzle generating less collision pressure than that of rapidly under a certain parameter of pipeline system of fuel dispenser. Similarly, it is applicable to stock noise. Therefore, user shall slowly turn on and off nozzle in operation so as to reduce hydraulic stock and noise, and prolong fuel life service of fuel dispenser. Most of manufacturers of fuel dispensers have mounted anti hydraulic stock d fuel dispenser evice in hydraulic system in order to abate the effects to fuel dispensers.
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o the JSF include the French Rafale jet, which comes in a version that lands on aircraft carriers, or an adapted version of the Eurofighter Typhoon, a jet being built by Britain, Germany, Spain and Italy. Other projects could be attractive too. This week, France teamed up with Britain on new aircraft carriers, offering to pay about a third of the design costs. ?006 will be the critical year for developing the future of the JSF programme in Britain,?says Nigel Whitehead, the managing director of air systems at BAE Systems, Britain s biggest defence contractor. Despite the hard feelings, Britain seems unlikely to quit the JSF, not least because it stands to profit handsomely from its sales to other countries. And withdrawing would also harm future collaboration on other defence projects such as Britain s Future Rapid Effect System and America s Future Combat Systems (FCS). Both are projects to develop a high-tech family of armoured troop- carriers. With America likely to spend about $30 billion just on researching and developing the FCS (and as much as $120 billion more buying it), the logic fuel dispenser of sharing some of the costs is unassailable. But until the current dispute is resolved, expect to see Britain steering well clear of new arms partnerships with its closest friend. © 2006 . Nuclear power Technology transfer Jan 26th 2006 From The Economist print edition fuel dispenser Selling Westinghouse is lucrative but controversial Get article background GOVERNMENTS—especially Britain s—are not known for being canny investors (see article). But the purchase and sale of Westinghouse, an American builder of nuclear reactors, by state-owned British Nuclear Fuels (BNFL) may prove a lucky exception. BNFL bought Westinghouse in 1999 as a prelude to possible privatisation. As BNFL s troubles mounted, however, the prospect of a float rece fuel dispenser ded. When it said in July 2005 that it planned to sell Westinghouse, the response was instant. Fifteen bidders sprang into a