Pressure drop test

VI1-3.5.2 Procedure. Facilities selected for pressure drop tests shall first be isolated and then tested. The following criteria shall be considered in determining test parameters ... 

Park and Li [267] also performed an experimental and numerical study in which a serpentine FF with and without diffusion layers was analyzed (see Figure 4.30). For the case in which a DL was not used, an impermeable plate was placed between the anode and cathode plates in order to perform the pressure drop tests. It was observed that the pressure difference between the two cases was as large as 80% of the pressure drop in the case without the DL. It was also explained that the reason for the large pressure difference between both cases was due to the cross-flow phenomena between adjacent channels through the porous diffusion layer. These researchers also performed the pressure drop tests when the fuel cell was running it was observed that the pressure drops were higher in this case than when the cell was inactive. It was believed that this pressure difference was a result of liquid water blocking reactant flow in either the channels or the DLs. 

Pressure drop test Air and other gases 10 7 10" Positive pressure Yes... 

A metallic mat is characterized by the specific pressure drop test. For this purpose an experimental device can... 

The dirt capacity and pressure drop test are similar in the respect that they can use the same apparatus. The dirt capacity test can be used to determine the dirt holding capacity... 

HEPA filter performance for the removal of radioactive particulate matter in the ventilation system hot exhaust is ensured by means of administratively controlled TSR surveillance activities. HEPA filters are subject to periodic pressure drop testing to verity operability (i.e., to verify that the filters are not plugged). They are also subject to periodic efficiency testing to verify the required level of particulate matter removal efficiency. HEPA filters are to be replaced, In accordance with operating procedures, when they become plugged or when the required efficiency can no longer be achieved. 

Karr, M. and L. W. Schutz, Pressure Drop Tests on Globe and Angle Valves with Oil and Water Flow , J. Am. Soc. Naval Engrs. 52 239-256 (1940). 

The first phase, in which two CARA fuel bundle prototypes have been built to perform hydraulic characterization of a spacer grid in low pressure drop test loop, is completed. This phase also included initial analysis of the vibrations in fuel rod - spacer spring system. Three spacer grid prototypes were tested. 

Related to fuel assembly design, hydrodynamic and structural tests are planned at two (low and high) pressure rigs. The fuel assembly, the low-pressure test section and the pressure drop tests have been completed. 

Figure 12. Friction pressure drop calculated with the Lockhart-Martinelli correlation using both liquid and two-phase equivalent length as a function of experimental friction pressure drop. Tests with Re < 10. ...

Cw can found Ci ierimentally either directly pressure drop tests or by evaluation of Co by means of the following expression ... 

A continuation of the pressure drop test, now using contaminated fluid, at the flow rate expected for the filter in use, will allow the differential pressure to rise (given a pump capable of achieving the differentials) to the point where the element is caused to fail or collapse. 

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