• Title/Summary/Keyword: fire.explosion

Search Result 643, Processing Time 0.022 seconds

A Study on Fire and Explosion Characteristics of Propane Gas (프로판가스의 화재 및 폭발 특성치에 관한 연구)

  • Ha Dong-Myeong
    • Journal of the Korean Institute of Gas
    • /
    • v.10 no.2 s.31
    • /
    • pp.33-39
    • /
    • 2006
  • For the safety design and operation of many gas process, it is necessary to know certain explosion limit, flash point, auto ignition temperature and minimum oxygen concentration of handling substances. Also it is necessary to know explosion limit at high temperature and pressure. For the safe handling of propane, explosion limit and autoignition temperature of combustion characteristics for propane were investigated. By using the literatures data, the lower and upper explosion limits of propane recommended 2.0 vol% and 10.0 vol%, respectively. Also autoignition temperatures of propane with ignition sources recommended $450^{\circ}C$ at the electrically heated cruicible fumace(the whole surface heating) and recommended about $960^{\circ}C$ at the local hot surface. The new equations for predicting the temperature and the pressure dependence of the explosion limits of propane are proposed. The values calculated by the proposed equations were a good agreement with the literature data.

  • PDF

Explosion Characteristics and Flame Velocity of Suspended Plastic Powders (플라스틱 부유 분진의 폭발특성과 화염전파속도)

  • Han, Ou Sup;Lee, Keun Won
    • Korean Chemical Engineering Research
    • /
    • v.54 no.3
    • /
    • pp.367-373
    • /
    • 2016
  • Many of plastic powders handled in industry are combustible and have the hazard of dust fire and explosion accidents. However poor information about the safe handling has been presented in the production works. The aim of this research is investigated experimentally on explosive characteristics of various plastic powders used in industry and to provide additional data with safety informations. The explosibility parameters investigated using standard dust explosibility test equipment of Siwek 20-L explosion chamber. As the results, the dust explosion index ($K_{st}$) of ABS ($209.8{\mu}m$), PE ($81.8{\mu}m$), PBT ($21.3{\mu}m$), MBS ($26.7{\mu}m$) and PMMA ($14.3{\mu}m$) are 62.4, 59.4, 70.3, 303 and 203.6[$bar{\cdot}m/s$], respectively. And flame propagation velocity during plastic dust explosions for prediction of explosive damage was estimated using a flame propagation model based on the time to peak pressure and flame arrival time in dust explosion pressure assuming the constant burning velocity.

Fire at an Indoor Shooting Range in Busan II. Causes and Fire Safety Measures (부산 실내사격장 화재 II. 원인 및 화재안전대책)

  • Park, Woe-Chul
    • Fire Science and Engineering
    • /
    • v.24 no.4
    • /
    • pp.92-97
    • /
    • 2010
  • Fire simulation by using a computational fluid dynamics model and examination of the fires at indoor shooting ranges broken out in the past were conducted, to presume causes of the fire at the indoor shooting range in Busan and suggest fire safety measures. On-site investigations and shooting tests on unburned gunpowder were also carried out. No trace of the muzzle spark and spark at the bullet trap was found in CCTV footage, and the impact of a stray bullet failed to ignite gunpowder. Cigarette was therefore presumed to be the most likely source of ignition among the potential sources. It appeared that the explosion in the shooting area was caused by violent burning of the polyurethane sound absorber and unburned gunpowder accumulated on it. The fire safety measures include prohibit of use of profile polyurethane sound absorber, removal of steel components from bullet trap, clean up and control of unburned gunpowder, etc.

Measurement of Fire Point and Flash Point for Alcohols Using Tag Open-Cup Apparatus (Tag식 개방계 장치를 이용한 알콜류의 인화점 및 연소점 측정)

  • Ha Dong-Myeong;Lee Sung-Jin;Song Young-Ho
    • Journal of the Korean Society of Safety
    • /
    • v.19 no.4 s.68
    • /
    • pp.69-73
    • /
    • 2004
  • The flash point is one of the most important combustible properties used to determine the potential for the fire and explosion hazards of industrial material and the fire point is the temperature of the flammable liquid at which there will be flaming combustion, sustained 5 seconds in response to the pilot flame. In this study, the flash point and fire point were measured to present raw data of the flammable risk assessment for alcohols, using Tag open-cup apparatus(ASTM D 1310-86). The measured values were compared with the calculated values based on 0.78 times stoichiometric concentration. The values calculated by the proposed equations were in good agreement with the measured values.

Safety Evaluation for the risk of explosion on Lithium Batteries (리튬전지의 폭발 위험성평가)

  • Kwon, Kyung-Ok;Kim, Yeong-Geun;Ma, Jin-Soo
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
    • /
    • 2011.04a
    • /
    • pp.371-375
    • /
    • 2011
  • 전지는 고에너지 밀도 제품으로 화학에너지를 전환시켜 전기에너지를 운반하는 것이다. 본 실험에서는 리튬 이온전지의 열적 안정성의 위험을 평가하기 위하여 리튬이온 전해액을 Differential Scanning Calorimeter(DSC)와 modified cloed pressure vessel test(MCPVT)로 분석하였다. 실험 결과 리튬전지는 다른 전지보다 위험하며, 전지를 잘못 사용하면 열적 반응성은 연소성 물질인 전해질을 포함하고 이것이 열을 발생시켜 폭발하거나 화재가 발생할 수 있음을 제시하였다.

  • PDF

Dust Explosion Prevention in the Plastics Industry (플라스틱 공장의 분진폭발 예방 대책)

  • 이형섭
    • Fire Science and Engineering
    • /
    • v.6 no.1
    • /
    • pp.55-64
    • /
    • 1992
  • 대부분의 플라스틱 분진은 폭발 위험을 내포하고 있으며 이러한 분진 폭발위험은 공장의 설계와 운영시 고려하여야 할 요소이다. 이러한 위험을 평가하고 그에 따르는 적절한 대책을 세우기 위하여는 무엇보다도 분진의 폭발 특성을 파악하여야 한다. 일반적으로 사용되고 있는 분진 폭발대책은 폭발을 안전하게 방출시키는 것이며 쉽게 발화되넌 플라스틱의 건조 공정, 분쇄 공정등에 있어서는 Suppression이나 Inerting등의 방법을 사용하는 것이 효과적이다. 이러한 기본적인 방법 외에도 일반적인 예방 대책으로는 위험 지역의 분류, 관리 철저, 그리고 분진 발생과 발화원을 최소화하고 폭발이 발생할 경우 폭발 지역을 자동 차단하도록 공장을 설계하는 것이다.

  • PDF

EXPLOSION HAZARDS IN TANKS OF HIGH FLASH POINT LIQUIDS

  • Zalosh, Robert
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
    • /
    • 1997.11a
    • /
    • pp.203-210
    • /
    • 1997
  • Reports of explosions in cargo and storage tanks of high flash point liquids such as residual fuel oil, asphalt, and oily waste water have shown that these explosions have occurred even when the liquid temperatures are well below the liquid nominal flash point. The reasons for these seemingly paradoxical explosions are reviewed and results of recent laboratory tests are presented to better define the conditions leading to flammable vapor atmospheres in these tanks. The potential effectiveness of various prevention measures are discussed including inerting, monitoring tank vapor concentrations, and periodic cleaning of condensation and deposits on the tank walls and roof.

  • PDF

Damage Evaluation of Bi-directionally Prestressed Concrete Panels under Blast-fire Combined Loading (폭발 후 화재하중 시나리오에 따른 2방향 프리스트레스트 콘크리트 패널부재의 손상도 평가)

  • Choi, Ji-Hun;Choi, Seung-Jai;Kim, Tae-Kyun;Kim, Jang-Ho Jay
    • Journal of the Korea Concrete Institute
    • /
    • v.29 no.3
    • /
    • pp.237-248
    • /
    • 2017
  • Frequent terror or military attack by explosion, impact, fire accidents have occurred recently. These attacks and incidents raised public concerns and anxiety of potential terrorist attacks on important infrastructures. However, structural behavioral researches on prestressed concrete (PSC) infrastructures such as Prestressed Concrete Containment Vessel (PCCV) and Liquefied Natural Gas (LNG) storage tanks under extreme loading are significantly lacking at this time. Also, researches on possible secondary fire scenarios after terror and bomb explosion has not been performed yet. Therefore, a study on PSC structural behavior from an blast-induced fire scenario was undertaken. To evaluate the blast-fire combined resistance capacity and its protective performance of bi-directional unbonded PSC member, blast-fire tests were carried out on $1,400mm{\times}1,000mm{\times}300mm$ PSC specimens. Blast loading tests were performed by the detonation of 25 kg ANFO explosive charge at 1.0 m standoff distance. Also, fire and blast-fire combined loading were tested using RABT fire loading curve. The test results are discussed in detail in the paper. The results can be used as basic research references for related research areas, which include protective design simulation under blast-fire combined loading.

Behavior of Fire Resistance Engineered Cementitious Composites(FR-ECC) under Fire Temperature (화재 온도를 받는 고인성.고내화성 시멘트 복합체의 거동)

  • Han, Byung-Chan;Kwon, Young-Jin;Kim, Jae-Hwan
    • Journal of the Korea Concrete Institute
    • /
    • v.19 no.2
    • /
    • pp.189-197
    • /
    • 2007
  • Concrete tunnel lining must be designed to having the fireproof performance because the lining are sometimes exposed to very high temperature due to traffic accident. Such fire temperature may cause explosion of concrete, or collapse of tunnel structure. The purpose of this study is to obtain the fundamental fireproof behavior of fire resistance-engineered cementitious composites(FR-ECC) under fire temperature in order to use the fire protection material in tunnel lining system. The present study conducted the experiment to simulate fire temperature by employing 2 types of FR-ECC and investigated experimentally the explosion and cracks in heated surface of these FR-ECC. Employed temperature curve were hydro carbon(HC, ECl) criterion, which are severe in various criterion of fire temperature. The numerical analysis is carried out the nonlinear transient heat flow analysis and verified against the experimental data. The complex features of behavior in fire conditions, such as thermal expansion, plasticity, cracking or crushing, and material properties changing with temperature are considered. By the use of analytical model, the concrete tunnel subjected to fire loads were analyzed and discussed. With comparison of current concrete materials and FR-ECC, the experimental and analytical results of FR-ECC shows the better fire resistance performance than the other.

A Study on Combustion Experiments of Multi Type Air-Conditioner Outdoor Units by Large Scale Calorimeter (라지스케일 칼로리미터에 의한 멀티시스템형 에어컨실외기의 연소실험에 관한 연구)

  • Min, Se-Hong;Bae, Yeon-Jun
    • Fire Science and Engineering
    • /
    • v.25 no.6
    • /
    • pp.168-177
    • /
    • 2011
  • The combustion test for real box of AC outdoor unit has been performed in this study in order to estimate the fire hazard in multi-system type of AC outdoor unit which is currently used for commercial use. The result showed that in test, there was explosion inside of AC outdoor unit, and flame erupted and fire spread through upper side grill. And then this fire burnt the combustibles such as wires, electronic control board, heat exchange copper plate and plastics etc inside the unit, refrigerant gas pipe was burst due to fire, and accelerated the explosion and flame eruption to outside while the refrigerant was erupting. It is found in this test that the maximum heat release rate of AC outdoor unit is 5,830 kW, the maximum internal temperature measured with infrared camera and thermocouple is $1,201^{\circ}C$, maximum ambient temperature is $881^{\circ}C$, and flame rose higher than about 5 m. It is concluded that the fire in AC outdoor unit cause fire to combustibles around the unit, and may give big damage by generating the secondary fire. It is expected that the result obtained from the test on the real object may be applied to fire realization of AC outdoor unit and estimation of fire spreading to the combustibles around in the future computer simulation.