• Title/Summary/Keyword: Fire.explosion

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A Study on application of F-N curve to OCA (장외영향평가 F-N curve 적용에 관한 연구)

  • Lee, Dong Hyeok;Yoo, Byung Tae
    • Journal of the Korean Institute of Gas
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    • v.22 no.5
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    • pp.31-37
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    • 2018
  • The distrust about chemical plant safety have been increased by occurring the major industrial accidents. Chemical plants have become more and more enlarged and sophisticated to increase production amount and decrease cost. So hazard of industrial accidents also have been increased. In this situation, quantitative risk assessment is activated by introducing OCA(Off-site Consequence Analysis). So it is possible to analyze the objective hazard of chemical plant. Currently OCA focus on the end point of hazardous area by fire/explosion/dispersion. But in this case, it is possible to analyze the industrial accident effect to near the chemical plant but hard to consider the actual hazard by frequency and population density. This study analyzes the validity about application of F-N curve to OCA by compare end point with F-N curve about accident.

A study on the Development of Low-loss Type Mold Autotransformers (저손실형 몰드 단권변압기 개발)

  • Lee, Jong-Su;Shin, Myung-Ho;Mun, Byung-Chul
    • Proceedings of the KIEE Conference
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    • 2003.10b
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    • pp.92-94
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    • 2003
  • The autotransformer currently used on the electric railway system is made of class A insulation material and uses the paper insulation method. As a power converter supplying power to the trolley wire, the autotransformer is one of critical equipment in the railway system. In the autotransformer, load irregularly changes and overload often occurs. These cause overheating of the autotransformer and facilitate deterioration of the autotransformer resulting in burnout accidents due to insulation breakdown. Also, the current autotransformer has poor insolation and short-circuit strength which often badly affect the service life of the transformer, and needs to improve its quality urgently. To overcome one of existing shortcomings of the mold transformer, manufacturers use epoxy resins that have superior flame retardancy to get rid of fro and explosion possibilities during accidents. Currently, new mold transformers are used in indoor distribution facilities with fire-fighting equipments. Coils molded in epoxy resins do not have their insulation performance compromised by humidity, dust, etc enabling easy inspection and maintenance. Comparing to the oil immersed transformer, the mold transformer does not have any concern about environmental pollutions by oil leak or replacement Therefore, to reduce breakdowns and improve reliability of the autotransformer, it is necessary to develop a new mold autotransformer with low loss suitable for our environment to suppress breakdowns of the autotransformer and improve the reliability. This study is about development of a low-loss mold autotransformer necessitated by reasons mentioned earlier.

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Study on the Prevention of Corrosion Damage for Underground Fuel Stroage Tank(1) (Corrosion Damage under the Sea Sand) (지하연료저장탱크의 부식손상 방지에 관한 연구(1) (바다모래에서 부식 손상))

  • 임우조;서동철
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.37 no.1
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    • pp.65-70
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    • 2001
  • As consumption rate of energy increase rapidly, the facilities of fuel storage tank become large size. Almost all of the industry or public facilities storing fuel in underground fuel storage tank is manufactured by steel materials. Thus, this fuel storage tank made of steel materials is damaged by stray-current corrosion, it become destruction. If fuel storage tank is destructed, petroleum, oil and gas are leaked. So it bring about environmental pollution, energy loss, fire and explosion. Therefor, in this study, for study on the prevention of corrosion damage in underground fuel storage tank, it were investigated by corrosion and stray-current corrosion for SS 400 in dry sea sand and wet sea sand along to specific resistance. The main results obtained are as follows : As specific resistance decrease in wet sea sand, corrosion rate per year increase linearly, in case of back fill up wet sea sand in underground fuel storage tank, if the water is flow into dry sea sand, corrosion tendency of underground fuel storage tank is supposed sensitive.

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Investigation of the Gas Accident Models through the Analysis Gas Accident Occurring Environment (가스사고 발생 환경분석을 통한 사고발생 모형 고찰)

  • Hur, Young-Taeg;Lee, Su-Kyung
    • Journal of the Korean Institute of Gas
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    • v.14 no.2
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    • pp.27-33
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    • 2010
  • Analysis of gas accidents for 11.5 years, from 1998 to June, 2009, by types has been made in this study to prevent the recurrence of accidents through the analysis of gas accident occurring environment. Gas using environment and gas accidents are forced to be closely connected since the number of gas accidents has not only been decreased but occurred steadily and gas using types are changing by time period, weather, etc. in terms of accident contents. Gas accidents have been occurred more in capital areas with larger gas usage and specific local governments. The possibility of the gas accidents hit the highest when the weather is clear, the wind speed is low and the humidity is in the middle. In addition, leakage of gas, fire or explosion are also considered to be closely related with the weather as a result of model observance of gas accidents types. All the gas related possible accidents are also considered to be predictable if this result is to be analysed in association with the weather.

A Study on Reliability Analysis and Quantitative Risk Analysis for Liquefied Petroleum Gas Station (LPG 충전시설에 대한 신뢰도 분석과 정량적 위험성 분석에 관한 연구)

  • Kim In-Won;Jin Sang-Hwa;Kim Tea-Woo;Kim In-Tae;Yeo Yeong-Koo
    • Journal of the Korean Institute of Gas
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    • v.5 no.4 s.16
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    • pp.40-48
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    • 2001
  • For a Liquified Petroleum Gas(LPG) station, the reliability analysis, such as Fussell-Vesely importance, risk decrease factor and risk increase factor, was carried out and the risk ranks of events were determined. In order to confirm the degree of the risks identified in the reliability analysis, the quantitative risk analysis was done for the equipments which had the large values of risk ranks. As a result of the importance analysis for the LPG station, the external event was identified as the most riskful event. The defect of construction structure and the pipe corrosion were riskful as well. The result of quantitative risk analysis showed that the length of 46.3 meters were estimated to damage the process equipments by the thermal flux from the catastrophic rupture of storage tank in Boiling Liquid Expanding Vapor Explosion.

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The Measurement of Lower Flash Point for tert-Pentanol+n-Decane System Using Tag Open-Cup Tester (Tag 개방식 장치를 이용한 tert-Pentanol+n-Decane 계의 하부인화점 측정)

  • Ha, Dong-Myeong;Lee, Sungjin
    • Journal of the Korean Institute of Gas
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    • v.16 no.5
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    • pp.41-46
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    • 2012
  • The flash point the lowest temperature at which the concentration of vapor of the substance in the air reaches the lower flammability limit(LFL), and is one of the most important physical properties used to determine the potential for fire and explosion hazards of industrial materials. The most published flash point data was for pure components and the flash points of the binary solutions that have flammable components, appear to be scarce in the literature. In the present study, the flash points of tert-pentanol+n-decane system were measured by Tag open-cup tester. The measured data were compared with the values calculated by the Raoult's law and the optimization methods based on the Wilson and NRTL equations. The calculated values by optimization methods were found to be better than those based on the Raoult's law.

Problem Solving for LPG Storage Tank using RPS-TRIZ (RPS-TRIZ를 활용한 LPG 저장탱크 문제해결)

  • Leem, Sa-Hwan;Huh, Yong-Jeong;Lim, Ju-Yeon;Kim, In-Gyu;Jeong, Shin-Young
    • Journal of the Korean Institute of Gas
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    • v.15 no.5
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    • pp.7-12
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    • 2011
  • LPG(Liquefied Petroluem Gas) Vehicles in metropolitan area being applied to improve air quality and have been proven effective for the reduction of air pollution. These gas stations are required to safe the storage tank because of possibility of causing huge loss of life and property. While storage tanks above ground have potential risk of explosion if fire breaks out and those under-ground are difficult to inspect due to poor accessibility neither above nor under-ground tank can serve us well. This study used the RPS-TRIZ (Rapidly Problem Solving-Teoriya Resheniya Izobretatelskikh Zadatch) technique and suggested the use of under-ground containment storage tank as a solution for safety issues and safety inspection.

A Study on the Accident Consequences of High Pressure Pipelines by Applying Reduction Factors (감소인자 적용에 따른 고압가스배관의 사고피해영향에 관한 연구)

  • Lee, Dong Hyuck;Jung, Sang Yong;Ko, Sang Wook;Kim, Min Seop;Ko, Jae Wook
    • Journal of the Korean Institute of Gas
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    • v.16 no.5
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    • pp.1-6
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    • 2012
  • It becomes a more and more common practice to build facilities bigger and more integrated in an effort to optimize the process within limited resources and spaces. As the capacity of facilities increases, so does the flow rate and pressure. This in turn leads to a high consequence of accident. Not only are these facilities vulnerable to leakage because of their high pressure, but also subsequent fire and explosion can be threatening. For these reasons, there is an urgent need to come up with solutions to assess and minimize the damage from an accident. The Quantitative Risk Assessment(QRA) is one of the most efficient ways to solve problems on pressurized pipelines. The QRA can be re-enforced by applying reduction factors. In this study various types of accidents in a pressurized pipeline were evaluated. The damage from accidents were computed, then. Finally the reduction factors were very effective to decrease consequences of high pressure pipeline accidents.

A Study of Risk Reduction by SIL(Safety Integrity Level) Determination (SIL(Safety Integrity Level) 선택에 의한 리스크 감소에 관한 연구)

  • Kim, Jung-Hwan;Kim, Bum-Su;Yang, Jae-Mo;Jang, Chang-Bong;Kim, Min-Seop;Jung, Sang-Yong;Ko, Jae-Wook
    • Journal of the Korean Institute of Gas
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    • v.15 no.5
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    • pp.57-62
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    • 2011
  • Modern chemical plants including petroleum refinery and gas industries have evolved into more complex and specialized. In these industrial complexes, it is important to maintain acceptable safety level protecting from various potential disasters caused by fire, explosion and the leakage of toxic materials. Recently possibility and consequence of accidents are increasing in the industrial process. So there is a trade-off between the plant operation efficiency and safety level. In this study SIF(Safety instrument Functions) was incorporated into SIL(Safety Integrity Levels). As a result, the safety level was upgraded by designing resonable allocation of safety instruments.

Hazard analysis for electrostatic of Electrostatic removing wear about combustible gas (가연성가스에 대한 정전기 대전방지복의 정전기 위험성 평가)

  • Chung jae hee;Seo dae won;Koo ja hyeuk;Lee yuung chul;Cho byung hak;Park sung soo;Rew keun chang;Hong Seong-Gyeong;Kim Jun-Ho
    • Journal of the Korean Institute of Gas
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    • v.4 no.2 s.10
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    • pp.33-36
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    • 2000
  • As a result of electrostatic hazard analysis of electrostatic removing wear about combustible gas, in accordance with using period, character of charge voltage is shown that propensity is increased. but character of electrostatic charge amount is below standard(0.6 $\mu$C) of the hazard of electrostatic removing wear, It would seem that character of charge voltage is raised because of swelling phenomenon of the normal fiber and other phenomena. Besides, In some case '96 parka of electrostatic removing wear shown as 0.82$\mu$C that exceed the uppermost limit of the fire and explosion. Therefore, countermeasure or improvement and control are needed.

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