• Title/Summary/Keyword: HAZOP-study

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Deviation - Propagation Models for Automating HAZOP Analysis of Batch Processes (회분식 공정의 HAZOP 분석 자동화를 위한 이탈전파 모델)

  • Ok You-Young;Hou Bo-Kyeng;Hwang Kyu-Suk
    • Journal of the Korean Institute of Gas
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    • v.3 no.2 s.7
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    • pp.34-42
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    • 1999
  • The discrete variables such as time and sequence must be considered for automating HAZOP analysis of batch processes in contrast with continuous processes. Because these variables can not be explained by the method used in the HAZOP analysis of continuous processes, we have developed the methodology for HAZOP analysis of batch processes on the basis of the relation between discrete variables and continuous ones. In this study, we have discussed the performance of the methodology on a Latex batch process to evaluate its effectiveness.

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Hazard Identification and Testcase Design Method based on Use Case and HAZOP (사용사례와 HAZOP 기반의 위험원 식별 및 테스트케이스 설계 방안)

  • Do, Sungryong;Han, Hyuksoo
    • Journal of KIISE
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    • v.43 no.6
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    • pp.662-667
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    • 2016
  • As electric and electronic control systems have sharply increased in vehicles, safety accident has emerged as an important issue. Therefore, in order to ensure safety of the vehicle, engineers are required to identify the hazards utilizing PHA and HAZOP, etc. in the early phase of development and implement safety mechanisms to prevent them. HAZOP has been widely used in a systematic manner based on guidewords. However, HAZOP identifies malfunctions from the top-level functionality provided by the system, so it cannot sufficiently identify hazards during the system operation. This leads to restrictions in designing testcases, because the safety requirements are derived from only some of the hazards. This research aimed to provide a hazard identification method utilizing Use case description, which defines operation procedure of the system and HAZOP and a testcase design method based on safety requirements. We introduced a case study on Smart Key Control System in vehicles and compared with hazards identification results based on HAZOP, to demonstrate the effectiveness of this study. The result of this study could potentially reduce development cost and increase system quality by adequately identifying hazards and safety requirements and designing the related testcase.

Development of Expert System for Automating HAZOP Analysis of Batch Process (회분식 공정의 HAZOP 분석 자동화를 위한 전문가 시스템 개발)

  • Hou Bo Kyeng;Hwang Kyu Suk
    • Journal of the Korean Institute of Gas
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    • v.5 no.1
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    • pp.21-28
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    • 2001
  • Expert system for automating HAZOP analysis of batch processes In contrast with continuous processes must consider the discrete variables such as time and sequence. So in this study, we have developed the expert system for automating HAZOP analysis of batch processes to analyse time and sequence on the basis of the relation between discrete variables and continuous ones. Because these variables can not be explained by the method used in the HAZOP analysis of continuous processes. The proposed expert system have been discussed on a Latex batch process to evaluate its effectiveness.

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Development of Worksheet Program for HAZOP (HAZOP 전용 워크쉬트 프로그램 개발)

  • Yoon I. K.;Ha J. M.;Han J. M.;Lee J. H.
    • Journal of the Korean Institute of Gas
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    • v.3 no.1
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    • pp.41-47
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    • 1999
  • Recently, HAZOP has been used as one of the most effective way of qualitative risk assessment for plant industries. However, this technique requires much man labor to be successfully performed. This fact enables the adequate HAZOP worksheet program to help speeding up the procedure and managing the data of analysis. Based on the experience of HAZOP carrying out, the authors focused the purpose of this study on developing a useful and comfortable HAZOP worksheet program. The unique characteristics of developed program are the menu window expressed in common steps of HAZOP, versatile edit functions, and search menu for investigating the scenario data. The tendency analysis for existing HAZOP results was performed to validate the usefulness of the developed program.

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A Study on the HAZOP-KR for Hazard Analysis of Train Control Systems (열차제어시스템 위험원 분석을 위한 HAZOP-KR에 대한 연구)

  • Hwang, Jong-Gyu;Jo, Hyun-Jeong;Han, Chan-Hee;Cho, Woo-Sik;Ahn, Jin;Ha, Dong-Myeong
    • Journal of the Korean Society for Railway
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    • v.13 no.4
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    • pp.396-403
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    • 2010
  • Train control system require high level of safety since these are vital control system to ensure safe operation of the train. According to these reason, safety-related regulations for railway signaling systems are standardized in IEC. In Korea, many attempts are tried to procure the level to meet the international standards, but thats's efforts are beginning steps. HAZOP study is recommended for hazard analysis at IEC standards, but this method has several unsuitable problems because this method is developed in chemical plant domain. In this paper we recommend new method of HAZOP, named HAZOP-KR, which would be suitable for analyzing safety of the train control systems. An example of this method applied to real system is also included.

Development of the Expert System for Hazard and Operability Analysis in Chemical Processes (화학공정의 HAZOP 분석을 위한 전문가 시스템 개발)

  • Kim Ku Hwoi;Kang In Koo;Lee Byung Woo;Lee Jong Min;Yoon En Sup
    • Journal of the Korean Institute of Gas
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    • v.3 no.1
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    • pp.48-57
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    • 1999
  • Safe plants are maintained by the systematic identification of potential hazards. Various hazard evaluation methods have been developed in pursuit of safe plants. Recently, much efforts has been made for the automation of hazard evaluation system by introducing expert system to get rid of weak points of the conventional hazard evaluation methods. HAZOP study is recognized as one of the most systematic and logical hazard evaluation methods. However, it has several disadvantages; experts should participate simultaneously, the detailed study is time-consuming, and the quality of the results largely depends on the quality of the experts. Therefore, the automation of HAZOP Study is highly beneficial for reducing the required time and obtaining the consistent evaluation results. In this study, a framework for the automation of HAZOP study is suggested. Based on the suggested framework, HAxSYM, an expert system to automate HAZOP study, has been developed. The case study validates the performance of the developed system, and the results are compared with the results from the conventional HAZOP study.

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A Study on the Hazard Identification and Risk Mitigation for ATSRX Using Hazard and Operability Study (HAZOP Study를 사용한 ATSRX의 위험원도출 및 리스크 완화에 관한 연구)

  • LEE Jun-Ho;LEE Kang-Mi;KIM Yong-Kyu;SHIN Ducko
    • Journal of the Korean Society for Railway
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    • v.8 no.6 s.31
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    • pp.533-538
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    • 2005
  • In this paper we identity the hazard using HAZOP study for ATSRX which is a subsystem of the ATP system, and we study a safety management method for the mitigation of the risk to the acceptable level. ATSRX is a device that make a train which has a ATP system operate in ATS line. For this ATSRX send a induction signal with ATS system to vehicle controller. Thus ATSRX can be said a safety equipment that makes a train operate safely. In order to identify the hazard for the internal faults in ATSRX system, we employ HAZOP study method which is recommended as hazard identification in IEC 62278, RAMS requirements in railway signal, and also it provide the detail activity in IEC 61882. Thus, in this paper we perform HAZOP study based on ATSRX related standards and using the assessment of the identified hazard we study a method to guarantee the system safety through the change of the design to mitigate the risk to the acceptable level.

A Study on Hazard Identification Method for Small and Medium Chemical Industries (중·소 화학공장에 적합한 위험성 평가 기법 개발에 관한 연구)

  • Lee, Jae Min;Yoo, Jin Hwan;Ko, Jae Wook
    • Korean Chemical Engineering Research
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    • v.45 no.1
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    • pp.103-108
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    • 2007
  • HAZOP analysis is a systematic method on the basis of the experts' experience and knowledge and is used for hazard identification and risk assessment by using brainstorming method. So, HAZOP analysis has been applied to major chemical industries efficiently. But it does not apply to small and midium chemical industries because of the insufficiency of the experts. Hence, in this study a new hazard identification method is proposed by modifying complexity and expertise of the HAZOP analysis and will be contributed to improve risk management for small and midium chemical industries.

Qualitative Hazard Analysis for a Batch Radical Reaction Process using HAZOP Method (HAZOP 기법을 이용한 회분식 라디칼 반응 공정에 대한 정성적 위험성 평가 방법 연구)

  • Park, KyungMin;Lee, DongKyu;Lee, JoonMan;Ahn, WonSool
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.20 no.2
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    • pp.385-393
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    • 2019
  • Potential fire, explosion and safety hazards exist in medium- or small-scale chemical plants using radical batch reaction processes due to the various conditions of materials, works or products. To minimize the potential damage, a study was conducted on qualitative hazard analysis using the HAZOP technique, which is a typical method for a qualitative risk assessment and analysis of the potential risks encountered in these chemical plants. For this purpose, a domestic chemical plant, which produces the acrylic resin by a radical batch reaction process, was selected and a risk assessment and analysis according to the procedure of HAZOP method was performed for the process. As the result of the study, to prevent the hazard, the input of inert gas and the installation of a pressure gauge were indispensable. In addition, the initiator and monomer should also be separated, and inhibiting substances and equipment are also necessary to prevent a runaway reaction.

A Study on the Application of Hazard Libraries When Using HAZOP in Hydrogen Systems (수소 전주기 시스템의 HAZOP 수행 시 위험 요인 라이브러리 적용 연구)

  • DOOHYOUN SEO;KWANGWON RHIE;DONGMIN LEE;DANBEE SHIN;HYOUNGI KIM;CHUNGHYUN LEE;TAEHUN KIM
    • Journal of Hydrogen and New Energy
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    • v.34 no.4
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    • pp.381-387
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    • 2023
  • The risk assessment (safety assessment) must be performed to verify the risks during operation and installation of the hydrogen system and to ensure safe design and operation. Among them, hazard and operability study (HAZOP), a qualitative risk assessment, is most often used to discover risk factors and secure safety. However, in HAZOP performance, there is a difference in the level of evaluation results depending on the level and experience of the evaluator, and there is a high possibility that subjective results will be derived. This study aims to develop a risk factor library that can list and provide information on potential risk factors in order to solve these problems when performing HAZOP, reduce risk factors that are omitted or overlooked.