Service Load Conditions

1 Structures type 1 and 2 were analysed under service loading by means of a finite element axlsymmetrlc analysis. The grid for the analytical model Is shown In figure 21. The structures were subjected to the following load cases  

3 It will be observed that the overall stress pattern In the two structures Is substantially the same. Examination of the full set of forty-two comparisons Indicates some small differences In the stress plots for profile 7 under load case 1. Under load case 2, however, these differences are almost completely cancelled out. Using the criteria In BS 4975I2, the stresses for structure 2 would be within acceptable limits. 

4 Although not evident from the stress profiles, tensile stresses occur around the haunches of both structures under load case 2. These were looked at closely and were found to be small and localised. At the lower haunch of structure 2 they are localised within the Inside corner block. 

The tensile zones that occur fall well within the limits laid down In BS 4975I2. 

5 This analysis showed that the behaviour of the vessel under service loads Is very similar with and without the chosen arrangement of planes of weakness. 

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The structural Implications of Introducing planes of weakness Into the activated zone of a typical PCRV have been assessed under service load conditions, seismic loading and ultimate load. 

Work-reiated fauits. If the work employees will perform in a manhole or vault could cause a fault in a cable, the employer shall deenergize that cable before any employee works in the manhole or vault, except when service-load conditions and a lack of feasible alternatives require that the cable remain energized. In that case, employees may enter the manhole or vault provided the employer protects them from the possible effects of a failure using shields or other devices that are capable of containing the adverse effects of a fault. 

Service load conditions are those loadings encountered during construction and in the normal operation of nuclear power facilities. A suggested summary of the list of loads is given below. 

For service load conditions, either the elastic analysis working stress design (WSD) methods of Part 1 of the AISC Specification or the plastic (limit) analysis load factor design (LRFD) methods of Part 2 of the AISC Specification may be used. 

With this equation the life of the bearing can be determined for different load conditions and is predetermined for the type of drive and service requirements. To select a proper bearing, therefore, the type of application and the loading ratio (CIP) should be carefully selected to ensure the required minimum life. Bearing manufacturers product catalogues provide the working life of bearings for different load factors and may be referred to for data on C, C and other parameters. 

From the example in Section 4.4.5, we found that for a single load application when stress and strength are variable gave a reliability Rj = 0.990358. We assume that this loading condition reflects that in service. We can now consult the reliability target... 

CE Service typical of certain turbocharged or supercharged heavy-duty diesel engines operating under both low speed-high load and high speed-low load conditions. Oils designed for this service must also meet the requirements specified for CC and CD classifications. 

Develop practical test program to demonstrate components ability to meet structural and performance criteria. Extent of such test program, if any, depends on economic value of component, number of units to be produced, consequences of failure, accuracy of structural analysis and design, margins of safety used in design, knowledge about service loads and environments, and difficulty of duplicating service loads and conditions in test... 

The previous sections provided general guidance on materials for hydrogen gas service and emphasized the metallurgical variables that influence hydrogen embrittlement. This section describes additional factors that impact hydrogen embrittlement, primarily environmental and mechanical-loading conditions. 

Structural performance requirements for blast resistant design include limits imposed on member deflections, story drifts and damage tolerance levels. Conventional serviceability requirements are not applicable for the one time severe blast loading conditions. See Chapter 5 for additional information. 

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