• Earthquakes and Structures
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• 제21권5호
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• pp.461-475
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• 2021

Strategic structures are a potential target of the growing terrorist attacks, so their performance under explosion hazard has been paid attention by researchers in the last years. In this regard, the aim of this study is to evaluate the blast-resistance performance of lead-rubber bearing (LRB) base isolation system based on a probabilistic framework while uncertainties related to the charge weight and standoff distance have been taken into account. A sensitivity analysis is first performed to show the effect of explosion uncertainty on the response of base-isolated buildings. The blast fragility curve is then developed for three base-isolated steel moment-resisting buildings with different heights of 4, 8 and 12 stories. The results of sensitivity analysis show that although LRB has the capability of reducing the peak response of buildings under explosion hazard, this control system may lead to increase in the peak response of buildings under some explosion scenarios. This shows the high importance of probabilistic-based assessment of isolated structures under explosion hazard. The blast fragility analysis shows effective performance of LRB in mitigating the probability of failure of buildings. Therefore, LRB can be introduced as effective control system for the protection of buildings from explosion hazard regarding uncertainty effect.

• 환경위생공학
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• 제13권2호
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• pp.82-87
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• 1998

The opening temperature of emit heat, caloric value and decomposition hear were investigated by DSC & TGA in order to find the hazard of sanitary feed-stuff, also explosion hazard of dust was observed with electrical ignition after fodder dispersion by compressed air. Then opening temperature of emit heat of supporting gas. $O_{2}$ was much lower than inert gas. Ar. and caloric value increased 20. and the particle size of sanitary feed-stuff were appeared fire or explosion at 50/60 mesh and 60/80 mesh.

• 대한안전경영과학회지
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• 제19권2호
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• pp.31-39
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• 2017

Classify of explosion hazardous areas must be made at the site where flammable materials are used. This reason is that it is necessary to manage ignition sources in of explosion hazardous areas in order to reduce the risk of explosion. If such an explosion hazard area is widened, it becomes difficult to increase the number of ignition sources to be managed. The method using the virtual volume currently used is much wider than the result using CFD(Computational Fluid Dynamics). Therefore, we tried to improve the current method to compare with the new method using leakage characteristics. The result is a realistic explosion hazard if the light gas is calibrated to the mass and the heavy gas is calibrated to the lower explosion limit. However, it is considered that the safety factors should be taken into account in the calculated correction formula because such a problem should be considered as a buffer for safety.

• 한국안전학회지
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• 제20권4호
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• pp.34-39
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• 2005

To evaluate characteristics of explosion hazard of Methyl Ethyl Ketone Peroxide, MCPVT was used for this study. In result maximum explosion pressure and maximum explosion pressure rising velocity of MEK-PO were $12.1kgf/cm^2\;and\;106.81kgf/cm^2/s$. As a result or adding metal powder to estimate hazard of explosion, the maximum explosion pressure and maximum explosion pressure rising velocity according to adding Fe powder in MEK-PO increased. In opposite, those decreased resulting in adding Ca powder in MEK-PO.

• Korean Chemical Engineering Research
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• 제55권5호
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• pp.600-608
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• 2017

산업현장에서 취급되거나 가공되는 원료의약품 분진의 폭발 위험성은 항상 존재하며, 이로 인한 폭발사고가 자주 발생되고 있다. 본 연구에서는 원료의약품 시료 3종의 분진폭발특성을 측정하였다. 주요 폭발특성 측정값은 록소프로펜산은 평균 입경이 $5.31{\mu}m$이며, $P_{max}$는 8.4 bar, 최소점화에너지는 1 mJ < MIE < 3 mJ이며 최소점화온도는 $550^{\circ}C$이다. 클로피도그렐 캄포르술폰산염은 평균 입경이 $95.63{\mu}m$이며, $P_{max}$는 7.9 bar, 최소점화에너지는 30 mJ < MIE < 100 mJ이며 최소점화온도는 $510^{\circ}C$이었다. 리팜피신은 평균 입경이 $26.48{\mu}m$이며 $P_{max}$는 7.9 bar, 최소점화에너지는 1 mJ < MIE < 3 mJ이며 최소점화온도는 $470^{\circ}C$로 나타났다. 이들 값을 적용하여 폭연지수($K_{st}$)와 폭발지수(EI)의 폭발위험등급을 구하고, 원료의약품 분진의 폭발 위험성을 비교 검토하였다. 그 결과 폭발 위험성은 록소프로펜산과 리팜피신의 폭발등급은 St 2이고 폭발위험등급은 severe이며, 클로피도그렐 캄포르술폰산염의 폭발등급은 St 1이고 폭발위험등급은 strong으로 나타났다.

• 환경위생공학
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• 제14권4호
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• pp.93-98
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• 1999

We had investigated combustion properties of rice bran dusts. Decomposition of rice bran dusts with temperature were investigated using DSC and the weight loss according to temperature using TGA in order to find the thermal hazard of rice bran dusts, and the properties of dust explosion in variation of their dust with the same particle size. Using Hartman's dust explosion apparatus which estimate dust explosion by electric ignition after making dust disperse by compressed air, dust explosion experiments have been conducted by varying concentration and size of rice bran dust.According to the results for thermodynamic stability of rice bran dust, there are little change of initiation temperature of heat generation and heating value for used particle size. But initiation temperature of heat generation decreased with high heating rate whereas decomposition heat increased with particle size. Average maximum explosion pressure was $10kgf/cm^2$ for 60/70 mesh and $1.5mg/cm^2$ dust concentration.

• International Journal of Safety
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• 제11권1호
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• pp.15-18
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• 2012

Because of development of printing technology, toner cartridge particle becomes smaller and more dangerous. And sometimes we had incidents with dust explosion of toner cartridge particle at recycling facilities in Japan. Therefore we studied on hazard of toner particle relating with dust explosion. We found that toner particle is so dangerous compared with most organic solids, even though it does not belong to hazardous materials in the UN regulation and the Japanese Fire Service Law.

• 한국가스학회지
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• 제14권3호
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• pp.14-20
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• 2010

본 논문은 리튬이온전지의 불꽃방전에 의한 폭발위험성에 관한 연구로서 휴대용기기의 전원으로 사용되는 리튬이온전지(일반용, 노트북용)를 시료로 선정하고, 폭발성 시험가스인 메탄, 프로판, 에틸렌, 수소를 대상으로 IEC형 불꽃점화 시험장치를 이용하여 불꽃점화실험을 실시하여 불꽃방전에 의한 폭발위험성을 규명하였다. 또한, 사고 시 단락전류에 의한 자체점화 가능성을 확인하고자 열화상카메라를 이용하여 온도변화를 측정하였다. 실험결과 리튜이온전지는 폭발성가스가 존재하는 폭발위험장소에서 사용할 때는 안전에 각별히 주의하여 사용 설계되어야 한다.

• 방재기술
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• 통권19호
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• pp.29-35
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• 1995

This decument, translated and rearranged deseribes the features of dust explosion and the factors which have an important effect upon the hazard of dust explosion on the purpose of prevention the disaster caused by dust explosion. The dust explosion exist close to our common life as latently, but it seems to be overlooking in com-mon, regretably Tr need to be evoked.

• 한국가스학회지
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• 제5권2호
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• pp.36-42
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• 2001

가정에서 일어나는 가장 일반적인 사고 중의 하나는 실내 가연성 가스누출에 의한 폭발 사고이다. 이러한 폭발 사고현장의 분석에 의하면 경우에 따라서 누출가스가 실내를 완전히 연소 하한계의 농도로 채올 수 있는 양보다 매우 작은 가연성 가스 양에 의하여 발생할 수 있다. 따라서 폭발이 일어날 수 있는 최소한의 가스 양은 실내 누출된 가스농도의 불균일한 정도에 의존하게 된다. 일반적으로 메탄과 같은 공기보다 가벼운 가스는 천장에서 축적되는 경향이 있고, 프로판의 경우에는 바닥에 축적되는 경향이 있다 본 논문에서는 매우 작은 양의 가스 누출에서 폭발 위험성 분석을 위한 가우스분포폭발 모델을 제시하였다. 이 모델은 연소한계농도에 기초를 두고, 특정 폭발 압력이 나타날 수 있는 최소한의 가스 누출량을 예측하는데 사용할 수 있다. 가우스모델을 이용하여 분석하면, 가정집에서 누출된 가스의 부피가 실내 부피에 비하여 $0.5\%$ 이하에서도 건물이 붕괴되는 폭발사고가 일어날 수 있다. 본 모델은 가스안전기기 개발을 위한 가스폭발 위험성 분석과 가정집에서 폭발사고 원인조사에 유용하게 활용될 수 있을 것으로 사료된다.