Relief Valve Impact Analysis

2021 ◽  
Author(s):  
Alton Reich
Keyword(s):  
Author(s):  
Alton Reich

Abstract In nuclear power plants power actuated pressure relief valves serve several purposes. They act as safety valves and open automatically in response to unusually high pressures in the primary system. They also act as power operated valves and are used to relieve steam in response to automatic or manually initiated control signals. These valves are required to lift completely over a short duration from the time that they receive an actuation signal, or the system pressure exceeds the set point. This short lift time results in the valve disk moving at high velocities, and can result in high impact forces on the piston and stem when the valve fully opens. In order to evaluate and improve the performance of a two-stage power actuated relief valve, an analysis was performed to calculate the impact force on the main disk piston when it opened and the resulting stresses. The analysis was based on the main disk piston velocity measured during valve testing. Of particular interest were the stresses in the threaded connection between the stem and the main disk piston.


2011 ◽  
Author(s):  
Eric M. Dunleavy ◽  
Nancy T. Tippins ◽  
Frederick L. Oswald

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Yanli Wang ◽  
Hao Sun ◽  
Sicheng Hao ◽  
Bing Wu

The university is considered one of the engines of growth in a local economy or its market area, since its direct contributions consist of 1) employment of faculty and staff, 2) services to students, and supply chain links vendors, all of which define the University’s Market area. Indirect contributions consist of those agents associated with the university in terms of community and civic events. Each of these activities represent economic benefits to their host communities and can be classified as the economic impact a university has on its local economy and whose spatial market area includes each of the above agents. In addition are the critical links to the University, which can be considered part of its Demand and Supply chain. This paper contributes to the field of Public/Private Impact Analysis, which is used to substantiate the social and economic benefits of cooperating for economic resources. We use Census data on Output of Goods and Services, Labor Income on Salaries, Wages and Benefits, Indirect State and Local Taxes, Property Tax Revenue, Population, and Inter-Industry to measure economic impact (Implan, 2016).


2012 ◽  
Vol 2 (8) ◽  
pp. 12-14 ◽  
Author(s):  
H. P. Singh H. P. Singh ◽  
◽  
R. P. S. Shaktawat R. P. S. Shaktawat ◽  
Durga Singh Durga Singh ◽  
S. C. Srivastava S. C. Srivastava

2019 ◽  
Vol 4 (2) ◽  
pp. 91
Author(s):  
Kastana Sapanli ◽  
Tridoyo Kusumastanto ◽  
Sugeng Budiharsono ◽  
Agus Sadelie

Marine economy is an economic activity carried out in the sea and land areas whose activities are still related to marine resources. The marine sector is defined as seven sectors, namely: fisheries, marine tourism, mining, marine industry, sea transportation (marine transportation), marine building, marine services. This study used descriptive and impact analysis in the national Input-Output Table in 2010. The total output of the marine sector accounted for 27.39% of total national output. The GDP value in the marine sector is able to contribute 30.32% of the total national GDP. From the results of calculations regarding the analysis of the multiplier numbers by output, the formation of new output in the economy was 1.4087 units. Analysis of multiplier numbers by job opportunities causes an increase in employment opportunities by an average of 0.1451 units. The majority of the sectors of maritime tourism show high distribution power. The largest sub-sector with a sensitivity index value is the trade service sub-sector, which is 1.4608. Key words: descriptive analysis, impact analysis, marine economy, I-O table


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