Seismic Fragility Tests of Motor Operated Valve Assemblies With Safety-Related Function

2008 ◽  
Author(s):  
Jiro Hirose ◽  
Kenichi Suzuki ◽  
Takashi Ueki ◽  
Naoki Yoshika
Keyword(s):  
Gate Valve ◽  
Low Cycle Fatigue ◽  
Earthquake Ground Motion ◽  
Seismic Capacity ◽  
Valve Body ◽  
Related Function ◽  
Target Acceleration ◽  
Active Valve ◽  
Vibration Tests ◽  
Capacity Data

Active valve assemblies in important systems to safety are required to maintain the operability during or following earthquakes. Motor operated valve assemblies have been designed to a validated response capacity 60m/s2 at the actuator in accordance with “JEAG4601-supplement 1991” in Japan. The Regulatory Guide for Reviewing Seismic Design of Nuclear Power Reactor Facilities issued in September 2006 defines Design Basis Earthquake Ground Motion and requires that residual risk for large earthquakes should be considered. It is needed to acquire seismic capacity data for a variety of active valve assemblies. JNES has performed fragility tests for motor operated valves: globe valve, gate valve and butterfly valve. An experimental test program is developed to ensure operating requirements for valve assemblies whose safety-related function is to open, close, or regulate fluid flow, and structural requirements for pressure boundary integrity. A series of vibration tests has been performed using shaking tables at varied acceleration levels up to target acceleration levels by sinusoidal waves. As a result of the vibration tests, the operability of valve assemblies for each type of motor operated valve has been verified at the target acceleration levels. The yoke of a motor operated gate valve connecting the actuator and the valve body was identified to be vulnerable for low cycle fatigue depending on the postulated load conditions in terms of intensity and frequency. The resulting seismic capacity data of actual valves will be applied for a fragility analysis of Seismic PSA.

Application Examples of ASME Code Case N-513 Implementation

2019 ◽  
Author(s):  
Robert O. McGill ◽  
Russell C. Cipolla ◽  
Eric J. Houston ◽  
Ronald J. Janowiak
Keyword(s):  
Gate Valve ◽  
Operating Experience ◽  
Straight Pipe ◽  
System Operation ◽  
Short Term ◽  
Valve Body ◽  
Safety Issues ◽  
Plant Safety ◽  
Asme Code ◽  
Moderate Energy

Abstract Code Case N-513 provides evaluation rules and criteria for temporary acceptance of flaws, including through-wall flaws, in moderate energy piping. The application of the Code Case is restricted to Class 2 and 3 systems, so that safety issues regarding short-term system operation are minimized. The first version of the Code Case was published in 1997. Since then, there have been five revisions to the Code Case that have been published by ASME. The Code Case has been used numerous times by utilities to avoid unscheduled shutdowns without impacting plant safety. Recent revisions of Code Case N-513 continue to expand its scope to piping components including elbows, reducers, branch tees and gate valve body ends. This paper provides three application examples of the Code Case implementation based on US plant operating experience. Specifically, detailed evaluations of through-wall leakage in straight pipe, a piping elbow and gate valve body end are provided. These examples will help facilitate Code Case implementation by future users.

Seismic Assessment of a Historical Tower with Advanced Numerical Model Tuned on Ambient Vibration Data

2010 ◽  
Vol 133-134 ◽  
pp. 617-622 ◽  
Author(s):  
A. D’Ambrisi ◽  
V. Mariani ◽  
M. Mezzi
Keyword(s):  
Element Model ◽  
Ambient Vibration ◽  
Seismic Capacity ◽  
Dynamic Identification ◽  
Seismic Behaviour ◽  
Vibration Data ◽  
Ambient Vibration Tests ◽  
Vibration Tests ◽  
Masonry Tower ◽  
Non Destructive

This paper deals with the dynamic characterization and the evaluation of the seismic response of the medieval civic tower of Soncino (Cremona, Italy). The dynamic characteristics and the mechanical properties of the masonry tower are evaluated through ambient vibration tests, which provide results in a fast and non destructive way with respect to the traditional methods such as forced vibration tests. Nonlinear static and dynamic analyses are performed on a finite element model of the tower calibrated on the results of the dynamic identification. The damage levels and the seismic capacity of the structure are also evaluated. The obtained results allow to predict the seismic behaviour of the tower and to define possible strengthening and restoration interventions.

Technical Basis for Proposed Fifth Revision to ASME Code Case N-513

2018 ◽  
Author(s):  
Dylan Cimock ◽  
Eric J. Houston ◽  
Russell C. Cipolla ◽  
Robert O. McGill
Keyword(s):  
Gate Valve ◽  
Evaluation Procedure ◽  
Straight Pipe ◽  
System Operation ◽  
Short Term ◽  
Valve Body ◽  
Safety Issues ◽  
Asme Code ◽  
Moderate Energy ◽  
Technical Basis

Code Case N-513 provides evaluation rules and criteria for temporary acceptance of flaws, including through-wall flaws, in moderate energy piping. The application of the Code Case is restricted to moderate energy, Class 2 and 3 systems, so that safety issues regarding short-term, degraded system operation are minimized. The first version of the Code Case was published in 1997. Since then, there have been four revisions to augment and clarify the evaluation requirements and acceptance criteria of the Code Case that have been published by ASME. The technical bases for the original version of the Code Case and the four revisions have been previously published [1, 2, and 3]. There is currently work underway to incorporate additional changes to the Code Case and this paper provides the technical basis for the changes proposed in a fifth revision. These changes include clarification for buried piping, investigation of various radii used in the Code Case, removal of the 0.1 limit on the flexibility characteristic for elbow flaw evaluation, and an update of the stress intensity factor parameters for circumferential through-wall flaws. In addition, a new flaw evaluation procedure is given for through-wall flaws in gate valve body ends. This procedure evaluates flaws in the end of the valve body as if in straight pipe. These changes and their technical bases are described in this paper. Clarifications and changes deemed editorial are not documented in this paper.

Vibration Durability Assessment of Sn3.0Ag0.5Cu and Sn37Pb Solders Under Harmonic Excitation

2009 ◽  
Vol 131 (1) ◽  
Author(s):  
Y. Zhou ◽  
M. Al-Bassyiouni ◽  
A. Dasgupta
Keyword(s):  
Mechanical Engineering ◽  
Failure Modes ◽  
Narrow Band ◽  
Low Cycle Fatigue ◽  
Stress Test ◽  
Harmonic Excitation ◽  
Cycle Fatigue ◽  
Mechanical Cycling ◽  
Mechanical Durability ◽  
Vibration Tests

In this paper, the vibration durability of both SAC305 and Sn37Pb interconnects are investigated with narrow-band harmonic vibration tests conducted at the first natural frequency of the test, printed wiring board, using constant-amplitude excitation. A time-domain approach, reported by Upadhyayula and Dasgupta (1998, “Guidelines for Physics-of-Failure Based Accelerated Stress Test,” Proceedings, Reliability and Maintainability Symposium, pp. 345–357), was adapted in this study for the fatigue analysis. The test board consists of daisy-chained components, to facilitate real-time failure monitoring. The response of the test specimens was characterized, and accelerated fatigue tests were conducted at different loading amplitudes to obtain a mix of low-cycle fatigue (LCF) and high-cycle fatigue data points. The SAC305 interconnects were found to have lower fatigue durability than comparable Sn37Pb interconnects, under the narrow-band harmonic excitation levels used in this study. This trend is consistent with most results from broadband vibration tests by Zhou et al. (2006, “Vibration Durability Comparison of Sn37Pb vs. SnAgCu Solders,” Proceedings of ASME International Mechanical Engineering Congress and Exposition, Chicago, IL, Paper No. 13555), Zhou and Dasgupta (2006, “Vibration Durability Investigation for SnPb and SnAgCu Solders With Accelerated Testing and Modeling,” IEEE-TC7 Conference on Accelerated Stress Testing & Reliability, San Francisco, CA), and Woodrow (2005, “JCAA/JG-PP No-Lead Solder Project: Vibration Test,” Boeing Electronics Materials and Processes Technical Report) and from repetitive mechanical shock tests by Zhang et al. (2005, “Isothermal Mechanical Durability of Three Selected Pb-Free Solders: Sn3.9Ag0.6Cu, Sn3.5Ag and Sn0.7Cu,” ASME J. Electron. Packag., 127, pp. 512–522), but counter to findings from quasistatic, LCF, and mechanical cycling studies by Cuddalorepatta and Dasgupta (2005, “Cyclic Mechanical Durability of Sn3.0Ag0.5Cu Pb-Free Solder Alloy,” Proceedings of the ASME International Mechanical Engineering Congress and Exposition, Orlando, FL, Paper No. 81171). Failure analysis revealed two competing failure modes, one in the solder and another in the copper trace under the component. Thus solder fatigue properties extracted with the help of finite element simulation of the test article should be treated as lower-bound estimates of the actual fatigue curves.

scholarly journals Finite Element Modeling of Material Fatigue and Cracking Problems for Steam Power System HP Devices Exposed to Thermal Shocks

2016 ◽  
Vol 63 (3) ◽  
pp. 413-434
Author(s):  
Jakub Pawlicki ◽  
Piotr Marek ◽  
Janisław Zwoliński
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Low Cycle Fatigue ◽  
Turbine Rotor ◽  
Steam Power ◽  
Valve Body ◽  
Temperature Changes ◽  
Steam Power System ◽  
Rapid Temperature ◽  
Thermal Shocks

Abstract The paper presents a detailed analysis of the material damaging process due to low-cycle fatigue and subsequent crack growth under thermal shocks and high pressure. Finite Element Method (FEM) model of a high pressure (HP) by-pass valve body and a steam turbine rotor shaft (used in a coal power plant) is presented. The main damaging factor in both cases is fatigue due to cycles of rapid temperature changes. The crack initiation, occurring at a relatively low number of load cycles, depends on alternating or alternating-incremental changes in plastic strains. The crack propagation is determined by the classic fracture mechanics, based on finite element models and the most dangerous case of brittle fracture. This example shows the adaptation of the structure to work in the ultimate conditions of high pressure, thermal shocks and cracking.

scholarly journals RESULTS OF THE APPLICATION OF NEW TECHNOLOGIES IN INCREASING RESOURCES IN HIGH PRESSURE DRILLS

2021 ◽  
Vol 08 (04) ◽  
pp. 10-16
Author(s):  
Elman Aliyev Elman Aliyev ◽  
Zohra Garayeva Zohra Garayeva
Keyword(s):  
High Pressure ◽  
Production Technology ◽  
Gate Valve ◽  
Oil And Gas ◽  
New Technologies ◽  
Valve Body ◽  
Molybdenum Steel ◽  
Technical Measures

In oilfield practice, as well as in the transportation of oil and gas, great importance is attached to the use of high-pressure valves. Since the demand for this fleet of equipment is growing, it is especially important to increase their resources and reduce their cost on this basis. Along with the constructive and technical measures taken in this direction, serious attention should be paid to improving the choice of materials for the manufacture of parts and their production technology.. The article is devoted to the discussion of the results obtained when using the coquille technology for the manufacture of parts made of low-alloy chromium-molybdenum steel Keywords: high-pressure gate valve, body, gate, seat, hardness, wear.

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