• Fire Science and Engineering
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• v.34 no.1
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• pp.18-25
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• 2020

In this study, the heat release rate of pipe insulation is analyzed by considering the installation status in accordance with the standards ISO 20632 and NFPA 274. The flame retardation rate was evaluated for six types of test samples: polyethylene foam covered with beaten silver (PE(S)), PE foam tapped (PE(N)), elastomeric closed cell thermal insulation (rubber), Japanese PE foam (PE(J)), Japanese polyurethane foam (PU(J)), and Japanese styro form (ST(J)) by EN 13501-1 and fire growth curve. The results show that PU(J), PE(J), and PE(N) were Class E and ultra-fast, NFPA 274 test standards for Class D and Fast, and PE(S) by ISO 20632 were Class C and Slow, and Rubber and ST(J) were Classes and Low. However, the changes in the time-averaged maximum heat release rate for each test standard (ISO 20632 and NFPA 274) to evaluate the flame retardation rate differed among identical materials. This means that the fundamental study is necessary to analyze the more accurate reasons.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.11a
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• pp.205-208
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• 2011

최근 사용하는 소방배관의 현장 시공에 사용되는 공법 및 부속을 살펴보면 정통방식의 부속연결 방식, Tee 가공방식, 분기관 방식을 사용하고 있다. 이 방식 중 가장 많이 사용되고 있는 방식은 Tee가공 방식과 분기관 방식으로 이는 우리나라의 소방배관 시설의 규모로 보았을 때 부속과 공법이 미흡하다 할 수 있다. 기존의 공법은 현장 적용성이 떨어지고 화재안전 성능이 미흡하다 할 수 있으며 사회가 발달 하며 건축물의 형태가 다양해지고 초고층화가 이루어지고 있는 과정에서 본 연구에서는 현재사용 하고 있는 공법의 분석과 새로운 소방배관 부속을 개발 하려 한다.

• Safety and Health at Work
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• v.8 no.1
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• pp.42-48
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• 2017

Background: As one of the most frequently occurring accidents in a chemical plant, a fire accident may occur at any place where transfer or handling of combustible materials is routinely performed. Methods: In particular, a jet fire incident in a chemical plant operated under high pressure may bring severe damage. To review this event numerically, Computational Fluid Dynamics methodology was used to simulate a jet fire at a pipe of a compressor under high pressure. Results: For jet fire simulation, the Kemeleon FireEx Code was used, and results of this simulation showed that a structure and installations located within the shelter of a compressor received serious damage. Conclusion: The results confirmed that a jet fire may create a domino effect that could cause an accident aside from the secondary chemical accident.

• Fire Science and Engineering
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• v.21 no.3
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• pp.69-77
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• 2007

Our country automatic wet pipe sprinkler system of hydraulically designed system has not deviated from the pipe regulation process, therefore we face limitations when using an independent method to hydraulically designed system. Therefore. after reviewing a developed country's methods using the drainage-density concept, we found it necessary for our country to introduce the drainage-density concept. Currently, under the National Fire Safety Codes(NFSC), this does not solve the problem and the limitation of hydraulically designed system because different problems arise depending on where the head was installed. To make improvements, first, such as the developed country, overcome the difference by introducing the drainage-density concept to determine the amount of drainage. Second, by using diverse head caliber and decreasing the limits on the amounts of distribution, we can expect a leveling off of the drainage density. Third, using the increase of hydraulically designed system through the application of the rule to hydraulically designed system, finally, development to performance based fire protection design.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2007.04a
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• pp.214-219
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• 2007

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.308-311
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• 2010

본 연구에서는 유한요소해석을 통하여 나선 주름모양 소방용 파이프를 모델링하여 각 모델간의 발생응력과 변형량을 상호간에 비교 검토하여 강도 안전성이 우수한 배관시스템의 설계 최적화를 하기 위함이 연구의 목적이다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.312-318
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• 2010

본 연구에서는 배관계에 가해진 압력으로 인하여 변형된 배관에 의하여 영향을 받는 브라켓에 대하여 여러 가지 형상으로 모델링하여 유한요소해석을 통하여 브라켓의 형상변화가 변형특성에 미치는 영향을 고찰 하였고, 배관시스템의 브라켓의 강도 안전성을 확보하기 위하여 산업공학에서 쓰였던 다구찌방법을 도입하여 최적화 설계를 하는 것이 본 연구의 목적이다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.302-307
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• 2010

본 연구는 최적설계 기법의 하나인 다구찌 방법을 이용하여 소방용 스프링클러 배관용 밀봉부에 대한 유한요소해석을 수행하고, 이를 통하여 소방용 배관의 밀봉안전성을 확보하고자 한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.7-11
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• 2010

본 논문에서도 유한요소해석과 최적설계 기법의 하나인 다구찌 방법을 이용하여 나선모양을 갖는 소방용 배관의 최적설계를 통하여 배관의 강도 안정성을 확보하고자 한다.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.12 no.1
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• pp.126-133
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• 2016

Recently, the research and development of Sodium-cooled Fast Reactors (SFRs) have made progresses. However, liquid sodium, the coolant of an SFR, is chemically unstable and sodium fire can be occurred when liquid sodium leaks from sodium pipe. To reduce the damage by the sodium fire, many fire walls and fire extinguishers are needed for SFRs. LBB concept in SFR might reduce the scale of sodium fire and decrease or eliminate fire walls and fire extinguishers. Therefore, LBB concept can contribute to improve economic efficiency and to strengthen defense-in depth safety. The LBB assessment procedure has been well established, and has been used significantly in light water reactors (LWRs). However, an LBB assessment of an SFR is more complicated because SFRs are operated in elevated temperature regions. In such a region, because creep damage may occur in a material, thereby growing defects, an LBB assessment of an SFR should consider elevated temperature effects. The procedure and method for this purpose are provided in RCC-MRx A16, which is a French code. In this study, LBB assessment was performed for PGSFR IHTS hot-leg pipe according to RCC-MRx A16 and the applicability of the code was discussed.