Level gauge assemblies

For around 20 years now, numerous standards and recommendations have been drawn up at national and international level and revised, whenever necessary, in accordance with the state of the art. These standards and recommendations must be observed whenever use is made of vacuum equipment (pumps, gauges, valves, etc.) and vacuum apparatus, systems and plants are assembled. They not only contain specifications applying specially to vacuum technology, but also go beyond this specific field and involve, for example, physical units, formulas, noise protection regulations, etc. 

A vacuum system is the assembly of the components which are used to generate, measure and maintain a level of vacuum required for CVD processes. This vacuum system typically includes chamber, pumps, valves, gauges and pipes connected together. 

Determining the interface level in a water/light hydrocarbon settler can be extremely difficult. If both phases are clean, they will also be transparent. First, blow the gauge glass assembly taps out after draining down the gauge glass, allow it to slowly refill (see Chapter 12). The interface can then be seen by its upward motion. For many settlers the aqueous phase will occupy the lower third of the vessel. 

The failure modes induced at different strain levels can be catalogued. Production operations can then be characterized with strain gauges and compared with the monotonic bend test data to determine whether excessive strain was applied on the PCA during any given assembly step. 

The SNL fuel assembly shaker table test campaign offered a source of validation data for the PWR fuel assembly model. The test campaign subjected a surrogate fuel assembly to shock acceleration loads while the surrogate fuel assembly was instmmented with a number of accelerometers and strain gauges. Comparison of the body of recorded test data to the calculated model results offered quantifiable evidence of the model s ability to predict realistic response of the key areas of dynamic response of the fuel assembly and local strains. A detailed report of the shaker table modehng is provided by Klymyshyn et al. and shows that the assembly-level model is in reasonable agreement with the shaker table data. 

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