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Fire Sci. Eng. > Volume 32(6); 2018 > Article
Fire Science and Engineering 2018;32(6):1-6.
DOI:    Published online December 31, 2018.
인위적으로 열화된 황색절연링형 금속플렉시블호스의 패턴 및 특성
이장우, 최충석
1한국가스안전공사 사고조사팀
2전주대학교 소방안전공학과
Patterns and Characteristics of Corrugated Stainless Steel Tubing for a Yellow Insulation Ring Type by Artificially Deteriorated
Lee Jang-Woo, Choi Chung-Seog
1Accident Investigation Team, Korea Gas Safety Corporation
2Dept. of Fire Safety Engineering, Jeonju University
본 논문은 배관용으로 사용되고 있는 황색절연링형(yellow insulation ring type) 금속플렉시블호스(CSST)를 인위적으로 열화(deterioration)시켜 소손되었을 때의 특성을 분석하는데 있다. 배관용 CSST는 튜브, 보호피막, 너트, 황색절연링, 패킹(packing), 이음쇠(socket)로 구성되어 있다. 그리고 튜브와 이음쇠 접속은 기밀성과 절연성능 향상을 위해 황색절연링과 고무 패킹을 사용한 것으로 판단된다. 실험에서 얻은 데이터를 95% 신뢰 구간에서 검증한 결과 AD (Anderson-Darling)는 0.945, P값은 0.015로 해석되었다. 배관용 CSST의 실험 데이터는 신뢰성이 있다는 것이 확인되었다. 가스 토치에 의해서 소손된 CSST의 산술적 평균 절연저항은 $16.7k{Omega}$으로 가장 컸으며, 전기적인 소손을 입은 CSST는 상대적으로 가장 낮은 $208{Omega}$, 정상 제품은 $1.72k{Omega}$으로 분석되었다. 그러므로 화재 현장에서 수거한 CSST의 절연저항 값을 분석하면 소손 원인 판정에 활용할 수 있을 것이다. 또한, 대전류공급장치(PCITS)로 CSST에 최대 전류 97 A를 약 5 s 동안 흘린 결과 보호피막 및 절연링은 정상 제품과 차이가 없었으나 금속 튜브의 일부에서 용융이 형성된 것을 확인할 수 있었다.
This study is to analyze the characteristics of the yellow insulation ring type of the CSST used for tubing when it is artificially deteriorated and damaged by burning. The CSST for tubing consists of a tube, protective coating, nut, yellow insulation ring, packing, and socket. In addition, it is thought that a yellow insulation ring and rubber packing were used to connect the tube and socket in order to improve the airtightness and insulation performance. The result of the verification of the data acquired from the tests in the 95% confidence interval shows that the Anderson-Darling (AD) and P value were analyzed to be 0.945 and 0.015, respectively. This confirms that the test data of the CSST for tubing is reliable. The analysis of the arithmetic mean of the insulation resistance of a CSST showed that the CSST damaged by burning by a torch, and the one damaged by electrical burning, was $16.7k{Omega}$ (the greatest relatively) and $208{Omega}$ (the lowest), respectively, while it was $1.72k{Omega}$ in the case of a normal product. Therefore, the analysis result of the insulation resistance of the CSST collected from the scene of a fire can be utilized to examine the cause of damage by burning. In addition, it was found that when the maximum current of 97 A was applied to the CSST for about 5 s using a Primary Current Injection Test System (PCITS) the protective film and insulation ring of the CSST has no difference from that of a normal product. However, a part of the metal tube was melted.
Key Words: Yellow insulation ring, CSST, Insulation resistance, Anderson-Darling (AD), P value, PCITS
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