Farley Main Steam Flow-Induced Vibration Investigation

2002 ◽  
Author(s):  
Gregory Zysk ◽  
Michael Oliver
Keyword(s):  
Data Analysis ◽  
Structural Modeling ◽  
Steam Flow ◽  
System Support ◽  
Diagnostic Equipment ◽  
Flow Induced Vibration ◽  
Root Cause ◽  
Start Up ◽  
Main Steam ◽  
Steam System

Piping vibration had been observed in the Farley Unit 2 main steam system since plant start-up. Hanger damage occurred in several portions of the system, including inside containment, in the Main Steam Valve Room (MSVR), and in the turbine building. A program was undertaken to determine the cause of the failures in the main steam supports. This program included the installation of diagnostic equipment, data analysis, and acoustic and structural modeling in an effort to determine the root cause of the piping vibration. The program also addressed a modified system support scheme, which included the addition of vibration absorbing and dampening devices. Recommendations were also provided to resolve the vibration issue.

Acoustic and Structural Modeling of Farley Main Steam Flow-Induced Vibration

2002 ◽  
Author(s):  
Gregory Zysk
Keyword(s):  
Structural Model ◽  
Dynamic Pressure ◽  
Pressure Oscillation ◽  
Relative Magnitude ◽  
Accelerometer Data ◽  
Acoustic Response ◽  
Flow Induced Vibration ◽  
Start Up ◽  
Main Steam ◽  
Steam System

Piping vibration has been observed in the Farley Unit 2 main steam system since plant start-up. Dynamic pressure and accelerometer data obtained during operation indicated that this was flow induced vibration. Acoustic modeling was utilized to evaluate potential origination locations of the pressure oscillation in the main steam system. Forcing pressure oscillations or “exciters” over a broad range of frequencies were imposed at various locations to simulate turbulent sources within the system. The relative magnitude of the acoustic response at the measured locations was compared to the data and used as a basis for determining the location of the source oscillation. The acoustic model was also used to generate forcing functions for a piping structural model that was used to evaluate measured accelerometer data.

Dynamic Simulation of a HRSG System for a Given Start-Up/Shut Down Curve

2011 ◽  
Author(s):  
Hun Cha ◽  
Yoo Seok Song ◽  
Kyu Jong Kim ◽  
Jung Rae Kim ◽  
Sung Min KIM
Keyword(s):  
Dynamic Analysis ◽  
Gas Turbine ◽  
Flow Rate ◽  
Exhaust Gas ◽  
Fuel Flow Rate ◽  
Fuel Flow ◽  
Start Up ◽  
Gas Turbine Exhaust ◽  
Main Steam ◽  
Duct Burner

An inappropriate design of HRSG (Heat Recovery Steam Generator) may lead to mechanical problems including the fatigue failure caused by rapid load change such as operating trip, start-up or shut down. The performance of HRSG with dynamic analysis should be investigated in case of start-up or shutdown. In this study, dynamic analysis for the HRSG system was carried out by commercial software. The HRSG system was modeled with HP, IP, LP evaporator, duct burner, superheater, reheater and economizer. The main variables for the analysis were the temperature and mass flow rate from gas turbine and fuel flow rate of duct burner for given start-up (cold/warm/hot) and shutdown curve. The results showed that the exhaust gas condition of gas turbine and fuel flow rate of duct burner were main factors controlling the performance of HRSG such as flow rate and temperature of main steam from final superheater and pressure of HP drum. The time delay at the change of steam temperature between gas turbine exhaust gas and HP steam was within 2 minutes at any analysis cases.

Community counseling: an opportunity and challenge (Indonesian and American perspective)

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Budi Astuti
Keyword(s):  
Data Analysis ◽  
Rapid Development ◽  
System Support ◽  
Literature Study ◽  
Cultural Issue ◽  
Analysis Techniques ◽  
Study Approach ◽  
American Perspective ◽  
Quantitative Data Analysis ◽  
Community Counseling

The purpose of this article is to explore the opportunity and challenge of implementing community counseling from Indonesian and American perspective. This article used a literature study approach. The literature study was conducted by reviewing books, journals, and research results publications from 2000 to 2017 and previous publications related to community counseling. Data analysis techniques in this study are quantitative data analysis techniques and qualitative data analysis techniques. This article concluded that the possible opportunity that can be applied to meet the challenge faced in achieving the optimization of the implementation of community counseling in Indonesia and America. Community counseling in the Indonesian perspective has the opportunity to be applied in formal and non-formal setting, but the challenge needs to be the provision of professional human resource and system support. Community counseling in the American perspective has the opportunity for rapid development in non-formal setting, but the challenge lies in the complexity of cultural issue and group identity. Keywords: community counseling, opportunity, challenge

scholarly journals ANALISIS PENYEBAB KEGAGALAN MENDIRIKAN USAHA BARU PADA PARA LULUSAN PROGRAM WIRAUSAHA BARU JAWA BARAT KELAS IDE BISNIS

2018 ◽  
Vol 6 (1) ◽  
pp. 31
Author(s):  
Rida Srihadiastuti ◽  
Deden Syarif Hidayatullah
Keyword(s):  
Data Analysis ◽  
Research Data ◽  
Business Failure ◽  
Entrepreneurship Training ◽  
Analysis Techniques ◽  
Start Up ◽  
New Business ◽  
Qualitative Descriptive ◽  
Descriptive Method ◽  
Main Factor

Wirausaha Baru Jawa Barat Program (WUB Jabar Program) which organized by Badiklatkop Bandung, is an entrepreneurship training in 3 choices of business field, those are food-beverage, convection, and salon. Participants are divided into Ide Bisnis class, Start-up class, or Growth class. Ide Bisnis Class is for participants who do not have a business, or already have a business but not yet reached the age of 1 year. Through a survey of 237 Ide Bisnis class graduates, there were 21 people who failed in establishing their new business after participated in the program. This research aims to determine the factors that caused failure. The qualitative descriptive method used in this research. Data collection techniques with an observation of program WUB Jabar, and interviews with 7 graduates who experienced business failure, also to 5 graduates whose business is still continuing. Data analysis techniques with Miles and Huberman models. The results of this research explained that the main factor causing graduates’ new business failure is the barrier on capital because barriers on capital causing barriers on other factors. And capital factor is also the most difficult barrier to be solved by the graduates who do not experience the business failure

Datengetriebene Steigerung der Verfügbarkeit/Data-supported root cause analysis to increase the availability of machine tools. Data-driven availability increase

2020 ◽  
Vol 110 (07-08) ◽  
pp. 532-535
Author(s):  
Eckhart Uhlmann ◽  
Roman Dumitrescu ◽  
Julian Polte ◽  
Maurice Meyer ◽  
Deniz Simsek
Keyword(s):  
Data Analysis ◽  
Machine Tools ◽  
Critical Factor ◽  
Root Cause Analysis ◽  
Data Driven ◽  
Manufacturing Companies ◽  
Cause Analysis ◽  
Root Cause ◽  
Comprehensive Data ◽  
Causes Of Failure

Die Zuverlässigkeit von Werkzeugmaschinen ist ein kritischer Faktor für den Erfolg produzierender Unternehmen. Durch die Analyse von Daten in der Produktplanung können Maschinenhersteller Ausfallursachen eliminieren und Maschinen systematisch verbessern. Jedoch stellt eine umfassende Datenanalyse viele Unternehmen vor große Herausforderungen. Die in diesem Beitrag vorgestellte Methodik adressiert diese Problematik und unterstützt Unternehmen bei der zielgerichteten Datenanalyse.   The reliability of machine tools is a critical factor for the success of manufacturing companies. By analyzing data in product planning, machine manufacturers can eliminate causes of failure and systematically improve machines. However, comprehensive data analysis poses great challenges for many companies. The methodology presented in this paper addresses this problem and supports companies in the goal-driven data analysis.

Study of the Pressure Distribution between the Piston Rings in Reciprocating Compressors

2011 ◽  
Vol 383-390 ◽  
pp. 6048-6052
Author(s):  
Dian Bo Xin ◽  
Jian Mei Feng ◽  
Yan Jing Xu ◽  
Xue Yuan Peng
Keyword(s):  
Pressure Distribution ◽  
Piston Ring ◽  
Dynamic Pressure ◽  
Threshold Value ◽  
Piston Rings ◽  
Premature Failure ◽  
Root Cause ◽  
Pressure Distributions ◽  
Start Up ◽  
Set Up

Piston ring is one of the most important sealing components that can be easily damaged in reciprocating compressors. The severe non-uniformity of the pressure distribution was suggested to be the essential reason for the premature failure of the piston rings. Therefore, a test rig was set up to measure the pressure distributions as well as the build-up of the dynamic pressure difference, which could reveal the root cause for the non-uniformity of the pressure distributions. The results showed that the build-ups of the pressure differences between different rings were not simultaneous; there existed a threshold pressure, and the latter ring could work only when the pressure before the former ring reached to the threshold value. The pressure distributions were also investigated at the start-up and shut-down of the compressor, which further validated the cause of the premature failure of the first ring.

Application of Earthquake Experience Data as Part of the Seismic Verification of Modified Main Steam Isolation Valve Leakage Pathway Piping

2004 ◽  
Author(s):  
Timothy M. Adams ◽  
Scott Quiggle
Keyword(s):  
Control Systems ◽  
Radioactive Iodine ◽  
Leakage Rate ◽  
Original Design ◽  
System A ◽  
Gas System ◽  
Group Report ◽  
Valve Leakage ◽  
Main Steam ◽  
Steam System

The Monticello Nuclear Generating Plant made modifications to the turbine island in 1998 to achieve a 5% power uprate. The radiological analysis conducted for power uprate took credit for deposition and holdup of radioactive iodine in the steam lines downstream of the Main Steam Isolation Valves (MSIV’s) and in the main condenser. The original design basis of certain main steam system piping, equipment, and components that comprise the MSIV Leakage Pathway was not in accordance with Seismic Category I requirements. As part of the original program seismic verification walkdowns were performed to demonstrate the main steam system piping, equipment, and components were seismically rugged. The walkdowns were done using the methodology suggested to seismically evaluate this pathway in the Boiling Water Reactor Owners’ Group report, entitled “BWROG Report of Increasing MSIV Leakage Rate Limits and Elimination of Leakage Control Systems”. In 2001, Monticello made significant changes to improve the performance of the plants hydrogen recombiner process. The hydrogen recombiners are part of the off gas system a portion of which was in the original MSIV Leakage Pathway. These modifications significantly redefined MSIV Leakage Pathway and required an updated assessment of the seismic ruggedness of piping and associated equipment in the MSIV Leakage Pathway. This paper describes the approach and methodology used to update and expand the seismic evaluations and seismic verification walkdowns. It also summarizes the results of these walkdowns and the steps necessary to demonstrate the seismic adequacy of the piping and equipment.

Fluid-Structure Interaction Modeling of a Subsea Jumper Pipe

2014 ◽  
Author(s):  
Mohammad A. Elyyan ◽  
Yeong-Yan Perng ◽  
Mai Doan
Keyword(s):  
Multiphase Flow ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Flow Experience ◽  
Flow Induced Vibration ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Start Up ◽  
Interaction Modeling

Flow-induced vibration (FIV) is one of the main reasons for subsea piping failure, where subsea pipes, which typically carry multiphase flow, experience large fluctuating forces. These fluctuating forces can induce severe vibrations leading to premature piping failure. This paper presents a transient numerical study of a typical subsea M-shape jumper pipe that is carrying a gas-liquid multiphase flow subject to a slug frequency of 4.4 Hz, starting from rest to include the start-up effect as part of the study. 3-D numerical simulations were used to capture the fluid-structure interaction (FSI) and estimate pipe deformations due to fluctuating hydrodynamic forces. In this paper, two FSI approaches were used to compute the pipe deformations, two-way coupled and one-way decoupled. Analysis of the results showed that decoupled (one-way) FSI approach overestimated the peak pipe deformation by about 100%, and showed faster decay of fluctuations than coupled (two-way) FSI analysis. The assessment of resonant risk due to FIV is also discussed.

Main Steam Line Constant Spring Support Failures

2011 ◽  
Author(s):  
Gyorgy Szasz ◽  
Christopher Wandell ◽  
Winston Borrero ◽  
Mark Jaeger
Keyword(s):  
Data Analysis ◽  
Data Acquisition ◽  
Steam Line ◽  
Single Source ◽  
Problem Resolution ◽  
Main Steam Line ◽  
Main Steam ◽  
Spring Support ◽  
Operating Units

Several constant spring supports attached to the main steam lines (MSLs) at Palo Verde Nuclear Generating Station (PVNGS) failed over a period of several years. The continued failures presented a need to instrument the MSL piping and supports, such that data could be collected in support of a cause determination and problem resolution effort. Extensive monitoring and data acquisition was performed over an 18-month period in all three PVNGS operating units, encompassing several revisions to the instrumentation configuration. This document presents an account of the project, with a timeline of events, detailed information on the instrumentation and data analysis, and other engineering efforts. Ultimately, no single source of failure was identified, as several potential contributors were uncovered. Modifications were implemented to mitigate the hanger failures, and the instrumentation was used to verify their effectiveness. No further failures have occurred after implementation of the modifications.

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