scholarly journals Fluid Transient Analysis during Priming of Evacuated Line

2017 ◽  
Author(s):  
Alak Bandyopadhyay ◽  
Alok K. Majumdar ◽  
KImberly Holt
Keyword(s):  
Transient Analysis ◽  
Fluid Transient

Fluid Transient Analysis for Safety Valve Vent Stack Using S-RELAP5 Code

2013 ◽  
Author(s):  
Jen-Sheng Hsieh ◽  
Pascal Brocheny
Keyword(s):  
Transient Analysis ◽  
Safety Valve ◽  
Time History ◽  
Gas Field ◽  
Blow Down ◽  
Discharge System ◽  
Fluid Transient ◽  
Forcing Functions ◽  
Hand Calculation ◽  
Relap5 Code

This paper is to present a fluid transient analysis for the safety valve vent stack which is an open discharge system using the AREVA in-house thermal hydraulic code S-RELAP5. S-RELAP5 was developed by AREVA to perform thermal hydraulic analyses. It is a RELAP5-based thermal-hydraulic system code which incorporates features of the NRC RELAP5/MOD2 and RELAP5/MOD3 as well as other improvements. S-RELAP5 deals with one-dimensional two-phase, two-fluid, non-equilibrium hydrodynamic model with a non-condensable gas field. ASME B31.1-2010 Non-mandatory Appendix II provides formulas for hand calculation of blow down forces at elbow exit and vent pipe. In general, this approach generates only steady state forces. To more accurately calculate forcing functions, S-RELAP5 is a good tool to achieve this task. The purpose of this S-RELAP5 application is to show that the usage of BRANCH and other components in the S-RELAP5 code can effectively simulate the safety valve open system discharge. This is a first-of-a-kind application of the code. Furthermore, this method provides an alternative to the ASME Appendix II hand calculation. In this paper a sample problem from ASME Appendix II is utilized to generate the time history forcing functions to demonstrate the versatility of S-RELAP5. These forcing functions can then be used for the subsequent piping dynamic analysis.

Fluid Transient Analysis in Pipelines With Nonuniform Liquid Density

1983 ◽  
Vol 105 (4) ◽  
pp. 423-428 ◽  
Author(s):  
S. W. Webb ◽  
J. L. Caves
Keyword(s):  
Boundary Conditions ◽  
Computer Program ◽  
Transient Analysis ◽  
Liquid Density ◽  
Characteristic Equations ◽  
Fluid Transient ◽  
Pipeline Valve ◽  
Input Parameters ◽  
Initial And Boundary Conditions

A fluid transient in a system with steady nonuniform liquid density can be analyzed by a single density computer program by modification of the input parameters. These changes allow the program to solve the correct characteristic equations with appropriate initial and boundary conditions. The applicability of the approach has been demonstrated by a transient analysis of a reservoir, pipeline, valve problem and comparing the results.

scholarly journals On-site non-invasive condition assessment for cement mortar–lined metallic pipelines by time-domain fluid transient analysis

2015 ◽  
Vol 14 (5) ◽  
pp. 426-438 ◽  
Author(s):  
Jinzhe Gong ◽  
Mark L Stephens ◽  
Nicole S Arbon ◽  
Aaron C Zecchin ◽  
Martin F Lambert ◽  
...  
Keyword(s):  
Time Domain ◽  
Transient Analysis ◽  
Cement Mortar ◽  
Condition Assessment ◽  
Non Invasive ◽  
Fluid Transient

scholarly journals Field study on non-invasive and non-destructive condition assessment for asbestos cement pipelines by time-domain fluid transient analysis

2016 ◽  
Vol 15 (1) ◽  
pp. 113-124 ◽  
Author(s):  
Jinzhe Gong ◽  
Martin Lambert ◽  
Aaron Zecchin ◽  
Angus Simpson ◽  
Nicole Arbon ◽  
...  
Keyword(s):  
Field Study ◽  
Time Domain ◽  
Transient Analysis ◽  
Condition Assessment ◽  
Non Invasive ◽  
Fluid Transient ◽  
Asbestos Cement ◽  
Non Destructive

Transient Analysis of an Experimental Mercury Flow Loop for SNS Validation

2005 ◽  
Author(s):  
Nathan P. DeLauder ◽  
Arthur E. Ruggles ◽  
Bernard W. Riemer ◽  
Thomas W. Burgess
Keyword(s):  
Centrifugal Pump ◽  
Computer Model ◽  
Transient Analysis ◽  
Pressure Pulse ◽  
Volumetric Flow Rate ◽  
Operating Conditions ◽  
Flow Loop ◽  
Pump Speed ◽  
Fluid Transient ◽  
Transient Events

A transient fluid acoustic model is compared with experimental data obtained from induced pump trips in a mercury loop. The facility consists of a stainless steel loop filled with 19,000 kg (21 tons) of mercury that is motivated by a 41 KW (55 hp) centrifugal pump through 37 m of piping in a full transit. At nominal operation, the volumetric flow rate from the pump discharge is 1400 LPM and velocities throughout the loop range from 0.3 to 3 m/s. A computer model of the mercury loop was made using the fluid transient code from Applied Flow Technology Impulse™. Loss of power to the mercury centrifugal pump may lead to fluidhammer, in which a cavity formed in low pressure regions created downstream of the pump outlet after the pump power is lost, collapses and gives rise to a pressure pulse. Fluidhammer has been created experimentally through a series of induced trips of the mercury centrifugal pump. Pump speed, volumetric flow rates, and dynamic pressures were gathered during the transient events. This data has provided information about the initialization, magnitude, and propagation of the pressure pulses associated with fluidhammer. The data gathered from these tests is presented and compared to simulation results gained from the computer model. Pressure magnitudes found in trip simulations at normal operating conditions nearly match those found in experiments, and other trends of the time traces show reasonable agreement.

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