한국가스학회지 (Journal of the Korean Institute of Gas)

  • 제22권6호
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  • Pages.104-108
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  • 2018
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  • 1226-8402(pISSN)
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  • 2713-6922(eISSN)
한국가스학회 (The Korean Institute of GAS)
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도시가스 정압기용 압력조정기 다이어프램의 사용기간에 따른 경년특성에 관한 실험적 연구

Experimental Studies on the Aging Characteristics by Service Periods of Regulator Diaphragms at Governor Room of City Gas

  • 이치우 (서울과학기술대학교 산업대학원 안전재난소방방재 프로그램학과) ;
  • 박달재 (서울과학기술대학교 안전공학과)
  • Lee, Chi-Woo (Disaster Safety & Fire Protection Program, Graduate School of Industry, Seoul National University of Science and Technology) ;
  • Park, Dal-Jae (Dept. of Safety Engineering, Seoul National University of Science and Technology)
  • 투고 : 2018.08.14
  • 심사 : 2018.11.16
  • 발행 : 2018.12.31
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초록

본 연구에서는 도시가스 정압기용 압력조정기 다이어프램의 사용기간에 따른 경년변화 특성을 조사하고자 사용기간별(신품, 5년, 10년, 15년, 20년, 25년 및 30년) 설치된 다이어프램을 대상으로 시험편을 제작하였고, 각 시험편에 대해 표면, 두께, 인장강도 및 연신율이 어떻게 변화하였는지 시험을 수행하였다. 표면 및 두께변화를 전자주사현미경을 이용하여 확인한 결과, 사용기간에 따라 약간의 영향을 받는 것으로 나타났다. 25년이 경과한 시험편은 신품 최고인장강도의 약 60%에 미치지 못하는 것으로 연신율은 사용기간에 따라 증가하는 것으로 나타났다. 이 연구결과는 향후 도시가스 정압기용 압력조정기 다이어프램의 교체주기를 정하는데 기초자료로 활용할 수 있으리라 기대된다.

Experimental studies have been done to examine the aging characteristics by regulator diaphragms of gas pressure, governor room of city gas. Various testing samples with different service periods were manufactured. The results of SEM observation indicated that the surface and thickness of the samples tested were slightly sensitive to the service periods. It was found that as the service periods increased, the tensile strength of diaphragm samples decreased. For samples over 25 years of service, the strength decreased to approximately 60 % of that of new diaphragms. It was also found that as the service periods increased, the elongation increased.

키워드

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Fig. 1. A diagram of gas regulator [11].

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Fig. 2. Selected Samples.

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Fig. 3. Manufactured test specimen.

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Fig. 4. SEM micrographs of diaphragm samples with a magnification of 500 x.

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Fig. 5. SEM images of both D new and D 25 samples with a magnification of 250 x.

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Fig. 6. Changes of stress by strain percentage for different service periods of diaphragms.

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Fig. 7. Reduction percentage in tensile strength according to the service periods of diaphragms.

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Fig. 8. Elongation percentage according to the service periods of diaphragms.

Table 1. Annual distribution of diaphragm samples used in this study

GSGSBE_2018_v22n6_104_t0001.png 이미지

참고문헌

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  9. Yang, Y. L., Qiao, L., Wang, C., Lu, F., and Kang, X. H., "Effect Analysis, of Temperature on the Rubber Material Stress-strain Relationship", Advanced Materials Research, 977, 116-119, (2014) https://doi.org/10.4028/www.scientific.net/AMR.977.116
  10. Woo C. S., Park, H. S., Yang, S. C., Jang, S. Y., and Kim, E., "Lifetime Prediction of Rubber Pad for High Speed Railway Vehicle", Trans. of Korean Society of Mechanical Engineers A, 33(8), 739-744, (2009) https://doi.org/10.3795/KSME-A.2009.33.8.739
  11. Https://www.elster-americanmeter.com
  12. Korean Agency for Technology and Standards, "KS M 6518, Vulcanized rubber physical test method", 4-5, (2016)