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http://dx.doi.org/10.7731/KIFSE.2018.32.6.001

Patterns and Characteristics of Corrugated Stainless Steel Tubing for a Yellow Insulation Ring Type by Artificially Deteriorated  

Lee, Jang-Woo (Accident Investigation Team, Korea Gas Safety Corporation)
Choi, Chung-Seog (Dept. of Fire Safety Engineering, Jeonju University)
Publication Information
Fire Science and Engineering / v.32, no.6, 2018 , pp. 1-6 More about this Journal
Abstract
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.
Keywords
Yellow insulation ring; CSST; Insulation resistance; Anderson-Darling (AD); P value; PCITS;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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