• Journal of the Korean Society for Railway
• /
• v.8 no.6 s.31
• /
• pp.533-538
• /
• 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.

• Proceedings of the Safety Management and Science Conference
• /
• 2000.05a
• /
• pp.193-200
• /
• 2000

Hazard and operability Review(HAZOP) is widely used as a process safety analysis which systematically identifies potential process deviations and settles the problems. In this paper, we carried out a process hazard analysis using HAZOP in K chemical plant. As a result, we showed that the plant could be operated more safely and be saved a lot of money by eliminating several existing hazardous factors through the change of processes and designs.

• Journal of the Korea Safety Management & Science
• /
• v.2 no.1
• /
• pp.129-139
• /
• 2000

Hazard and operability Review(HAZOP) is widely used as a process safety analysis which systematically identifies potential process deviations and settles the problems. In this paper, we carried out a process hazard analysis using HAZOP in K chemical plant. As a result, we showed that the plant could be operated more saftly and be saved a lot of money by eliminating several existing hazardous factors through the change of processes and designs.

• Journal of the Korean Society of Safety
• /
• v.13 no.1
• /
• pp.77-84
• /
• 1998

Hazard and operability (HAZOP) analysis is one of the safety analysis method that is used in the chemical complex, because it can systematically identify causes and consequences of all the deviation that could occur. Since this method needs to hire specialized experts, it is costly and time-consuming. Therefore HAZOP Expert System has been developed to automate this analysis. This approach introduced object-oriented method and knowledge representation which is hierarchical tree of units to supply flexibility in the system, functional semantic network, propagation equation and rule-chaining method to set up the expert system for automating HAZOP analysis.

• Journal of Advanced Research in Ocean Engineering
• /
• v.3 no.3
• /
• pp.125-135
• /
• 2017

The paper considers the practical application of the FMEA(Failure Mode and Effect Analysis) method to assess the operational reliability of the LNG(Liquefied Natural Gas) transfer system, which is a potential problem for the connection between the LNG FPSO and LNG carrier. Hazard Identification (HAZID) and Hazard operability (HAZOP) are applied to identify the risks and hazards during the operation of LNG transfer system. The approach is performed for the FMEA to assess the reliability based on the detection of defects typical to LNG transfer system. FTA and FMEA associated with a probabilistic risk database to the operation scenarios are applied to assess the risk. After providing an outline of the safety assessment procedure for the operational problems of system, safety assessment example is presented, providing details on the fault tree of operational accident, safety assessment, and risk measures.

• Journal of the Korean Institute of Gas
• /
• v.3 no.1
• /
• pp.48-57
• /
• 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.

• Journal of Environmental Impact Assessment
• /
• v.13 no.1
• /
• pp.1-8
• /
• 2004

A wide spectrum of risk assessments including qualitative and quantitative approaches and the analyses of its consequence were performed for an environmentally sensitive object such as incineration facility. To find out the major risk concerns, HAZOP(Hazard and Operability) were performed. Then, the frequency of hazardous gas release scenarios was calculated. Finally consequence analyses were performed for the gas release scenarios. On the basis of analyses through evaluation, a more innovative way for making a better control system or the enhancement of operation procedure was given. The results from these analyses would act as a substantial benefits for the incineration facility operator, and giving some measured information for the neighbors and the people involved.

• Journal of the Korea Safety Management & Science
• /
• v.14 no.1
• /
• pp.95-100
• /
• 2012

This study is about the qualitative safety assessment for hydrogen gas filling facilities in Korea operating with one-bank type. The purpose of this safety assessment is about the development of components for design, fabrication, assembly, operability of dispenser and systems of the safety. For the qualitative safety assessment method, the study used FMEA(failure mode & effect analysis) and HAZOP(hazard & operability). This study evaluated the safety through FMEA and HAZOP then by referring to P&ID and PFD of hydrogen dispenser, thereby examining the dangerousness of the equipments, defects of the structure and problems of the operation.

• Korean Chemical Engineering Research
• /
• v.53 no.4
• /
• pp.431-439
• /
• 2015

The methods which decrease the accident hazards of LPG(Liquefied Petroleum Gas) terminal on the basis of butane & propane storage tanks by applying HAZOP(Hazard and Operability), LOPA(Layer of Protection Analysis) and SIL(Safety Integrity Level) are suggested. The accident scenarios were derived by analyzing latent risks through the HAZOP. The scenarios which would have the big damage effect in accidents were selected and then LOPA was assessed by analyzing IPL(Independent Protection Layer) about the correspond accident scenarios. The improved methods were proposed on the basis of level of SIF(Safety Instrumented Functions) as a IPL considering satisfied condition of risk tolerance criteria($1.0{\times}10^{-05}/y$). In addition, The proposed IPLs were basis on the economic analysis. The effect of SIF as a IPL considering the changes of accident frequency was studied in case of the accident scenarios derived from the concerned process.

• Proceedings of the Korean Institute of Industrial Safety Conference
• /
• 2002.05a
• /
• pp.317-322
• /
• 2002

위험성 편가의 목적은 현재의 위험 상태를 평가하고 이들 위험이 허용가능한가를 평가하여 시스템의 개선과 위험을 감소시기는 데 있다. 기업에서 모든 위험을 Zero화 시킨다는 것은 현실적으로 어렵기 때문에 사업장에서 발생할 수 있는 모든 이탈 상태를 파악하고, 안전경영의 우선순위를 정하여 운영해야 한다. 이에 필요한 것이 위험성 평가이며 위험성 평가의 필수적인 요소는 정량화를 통하여 허용가능성 여부를 판단하는 것에 있다.(중략)