• Title/Summary/Keyword: Precision safety diagnosis

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Problems of Insufficient Detailed Inspection and Precision Safety Diagnosis and the Improving Direction for the Evaluation System (부실 정밀점검 및 정밀안전진단의 문제점과 평가제도의 개선방향)

  • Ha, Myung Ho;Park, Jong Sup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.15 no.5
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    • pp.160-168
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    • 2011
  • As importance of the field of maintenance and management come to the fore because of collapses of the Seongsu bridge and the Sampoong department store, "Special Act for the Safety Control of Public Structures" was established in 1995 and the major maintenance and management system began taking effect "Detailed inspection and Precision safety diagnosis". However, a technical standard of "Detailed inspection and Precision safety diagnosis" was low because its history was not long, and also the results of research were not enough so anxiety for "Insufficient Detailed inspection and Precision safety diagnosis" was continuously left. While its evaluation system introduced in 2002, the ratio of "Insufficient Detailed inspection and Precision safety diagnosis" has been getting lower. However, according to the evaluation result after carrying out "Detailed inspection and Precision safety diagnosis" recently, it seems difficult to become lower for the ratio of "Insufficient Detailed inspection and Precision safety diagnosis" in future. Therefore, it is considered of questionary survey of the concerned organization and the mechanism side in connection with "Insufficient Detailed inspection and Precision safety diagnosis". So it is arranged the fundamental problems caused by an "Insufficient Detailed inspection and Precision safety diagnosis" that is to show the improving direction of the existing evaluation system in a based on this.

The Analysis of Current Situation of the Building Precision Safety Inspection and Precision Safety Diagnosis Cost from Practitioners Viewpoint (실무자 관점에서의 건축물 정밀안전점검 및 정밀안전진단 실행대가 현황분석)

  • Lee, Jong-Phil;Lim, Nam-Gi
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.4
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    • pp.37-41
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    • 2018
  • Recently, interest in the safety and maintenance of the structures is growing. However, due to the low-cost order placed by the ordering organization, the safety diagnosis specialized institution becomes insolvent and many problems have arisen due to insufficient inspection and diagnosis. Therefore, in this study, the current status of bid cost was examined through the survey of the practitioners and case analysis. As a result, Precision safety inspection is deemed that it is necessary to increase the efficiency of the criteria cost and to strengthen the rigidity of the criteria cost rather than adjusting the criteria cost. Precision safety diagnosis, the criteria cost for structures with a floor area of less than $10,000m^2$ is lowered to 80 % from the current standard. For structures larger than that, the current criteria cost are applied, but it is deemed necessary to strengthen the rigidity of the criteria cost.

A study on the improvement plans of precision safety inspection and precision safety diagnosis in tunnel structure (터널구조물 정밀안전점검 및 정밀안전진단 개선방안 고찰)

  • Lee, Gyu-Phil;Kim, Jeong-Heum
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.24 no.2
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    • pp.183-192
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    • 2022
  • Function and performance degradation in tunnel structure can cause road's function loss, proactive maintenance is needed to prevent the initial damage from progressing to intensified damage. Inspection and diagnosis are implemented in accordance with regulations, but it does not fully reflect maintenance processes such as inspection and diagnosis, planning rehabilitation and carrying out. It was carried out for 5,540 cases inspection and diagnosis result in 1,728 tunnels was analyzed to suggest rational maintenance plan in this study.

Estimation of National Loss Expenses to Insufficient Safety Inspection and Precision Safety Diagnosis (부실 정밀점검 및 정밀안전진단의 국가적 손실비용 추정)

  • Ha, Myung-Ho;Park, Jong-Sup
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.14 no.6
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    • pp.246-253
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    • 2010
  • National major facilities have been rigorously investigated using regular safety inspections and precision safety diagnosis since the Special Law for Facilities Safety Management was made in 1995. However, the process of safety inspection and precision safety diagnosis could be doubted due to intervention of facility owner for safety level evaluation, competition to obtain low price order, and low technical skills of inspection companies. Although the management processes for evaluating the inspection companies were used for several years, the process should continue to improve in the safety inspection field. This study analyzed the recent evaluation system and the ratios of insufficient inspection. Estimation of national loss expenses to the insufficient safety inspection was investigated to recognize the necessity for the improvement of facility inspection process and evaluation system.

Air-Operated Valve Diagnostic System Development (공기구동밸브의 진단시스템 개발)

  • 양상민;송동섭;허태영;김봉호;신성기;김찬용;조택동
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.430-433
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    • 2003
  • Air-operated valve is one of principal valves that are using to control fluid flow. A period diagnosis for safety of power plants is necessary. But there are many difficulties such as economic loss caused by intone of high cost devices and a matter hard to deal with users. In this study we developed the diagnosis system that usersofpower plants are easy to handle. The diagnosis system is composed of database module, reliability analysis module, design safety nodule and diagnosis test and evaluation module.

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On the Improvement of the Process by Analyzing Precision Diagnosis of Deteriorated Railroad Communication Facilities

  • Hwang, Sun Woo;Kim, Joo Uk;Park, Jeong Jun;Kim, Hyung Chul;Park, Jin Hyuk;Kim, Young Min;Lee, Gye Chool
    • International Journal of Internet, Broadcasting and Communication
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    • v.13 no.2
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    • pp.136-144
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    • 2021
  • Railroad Systems, which are national infrastructure industries, cause unexpected property and human damage if they fail to function while operating. Accordingly, railroad facilities supporting the railroad system are areas where high reliability and safety are required. However, it is time for systematic and scientific maintenance to be taken away from the traditional maintenance methods, as the nation's railroad facilities are now aging seriously. The purpose of this study was to secure the safety and reliability of the aging railroad communication facilities and to improve their performance. The research subjects were selected as a precision diagnosis process for railroad communication facilities, and improvement points were derived through detailed precision diagnosis process analysis. It is deemed that this study can contribute based on securing stability, improving reliability, and continuous improvement of railroad communication facilities should be conducted in the operation of the entire railroad system.

Failure Diagnosis of pressurizer in PWR (PWR의 가압기 고장진단)

  • Park, J. H.;Lee, D. H.;lee, S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.474-477
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    • 2002
  • Safety is very important to operate nuclear power plant. To guarantee the safety, nuclear power plant should be run without trouble. This paper presents the application of a failure diagnosis approach based on discrete event system theory to the pressurizer pressure control system for Pressurized Water Reactor. Also, this paper shows a scheme of failure diagnosis by distributed diagnoser.

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A Development of Condition Evaluation Standard Considering Structural Characteristic for Members of LNG Outer Storage Tanks (LNG 외조 저장탱크의 구조적 특성을 고려한 상태평가 기준 개발)

  • Choi, Kyoung-Jae;Seo, Chang-Joo;Kim, Young-Gu;Jo, Young-Do;Kim, Jung-Hoon
    • Journal of the Korean Institute of Gas
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    • v.21 no.5
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    • pp.64-69
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    • 2017
  • South Korea is the world's second-largest importer of LNG and possess about 70 tanks which are in operation by 2017. Thirty years as the design warranty period have exceeded since LNG storage tanks as the core facility of LNG industry were constructed in 1986. The LNG storage tank is under precision safety diagnosis from 2014 due to urban gas business act amendment. There is no criteria of condition evaluation for outer tank of LNG storage tank at the time of precision safety diagnosis. Through analysis of structural characteristic of LNG storage tank and civil structure condition evaluation standards, the criteria of condition evaluation for main members was developed. The criteria of objective condition evaluation can improve safety and reliability of LNG storage tank and suggest matenance criteria.

A study on the Development of the Device for Portable Safety Diagnosis and Dynamic Characteristics Analysis of Elevator using Fuzzy Algorithm (Fuzzy 알고리즘을 이용한 엘리베이터 포터블 안전진단 및 동특성 분석장치 개발)

  • 김태형;김훈모
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2000.11a
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    • pp.123-126
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    • 2000
  • An elevator system which is a essential equipment for a vertical movement of object, as a property of building, have been drove by various expenditure and purpose. Since developing electrical control technology, control systems are highly developed. An elevator equipment is expended to wide, but a data accuracy acquisition technique and safety predict technique for securing system safety is still basic level. So, objective verification for elevator confidence condition is required absolutely accuracy measurement technique. Therefore, this study is accomplished in order to conquer a method of depending on sense of a manager with a simple numeric measurement data, and construct a logical, analytical foresight system for more efficient elevator management system.

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Failure Diagnosis of Main Feedwater System for SIR using DES (DES를 이용한 SIR의 주급수계통의 고장진단)

  • Park, J. H.;Kim, H. P.;Kim, C. S.;Lee, S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.570-573
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    • 2001
  • Safety is very important to operate nuclear power plant. To have the safety, nuclear power plant should be run without trouble. This paper presents the application of a failure diagnosis approach based on discrete event system theory to the Main Feedwater System for Safe Integral Reactor.

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