Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Negligible Extent(NE) and Release Characteristic of KS C IEC 60079-10-1(2015) Standard

KS C IEC 60079-10-1 규격의 무시할 수 있는 정도와 누출특성에 관한 연구

  • Cho, Pil-rae (Department of Safety Engineering, Korea National University of Transportation) ;
  • Lee, Hyang-jig (Alpha Safety Co., Ltd.) ;
  • Baek, Jong Bae (Department of Safety Engineering, Korea National University of Transportation)
  • 조필래 (한국교통대학교 안전공학과) ;
  • 이향직 (알파안전주식회사) ;
  • 백종배 (한국교통대학교 안전공학과)
  • Received : 2020.03.09
  • Accepted : 2020.04.22
  • Published : 2020.04.30
Download PDF
⟨ Previous Next ⟩

Abstract

When KS C IEC 60069-10-1(2015) standard is applied to estimate a hazardous area, the chart showing the relationship between a hazardous area distance and release characteristic is used as a guide to determine the extent of hazardous zones for various forms of release. Three release characteristic lines based on the three types of release as an unimpeded jet release with high velocity, a diffusive jet release with low velocity, and a release of heavy gases or vapours that spread along horizontal surfaces are given. As these characteristic lines have the low limit threshold, it is difficult to estimate the hazardous area distance when the value of release characteristic is under the low limit threshold. And KS C IEC 60079-10-1(2015) standard shows the concept for a zone of Negligible extent(NE) which can be considered as non hazardous area, but it is also difficult to apply the concept of a Negligible extent. The purpose of this paper is to suggest the guideline for the release characteristic to decide a hazardous area distance and the Negligible extent(NE) being considered as non-hazardous area when deciding a hazardous area distances by the KS C IEC 60079-10-1 standard.

Keywords

References

  1. KS C IEC 60079-10-1, "Explosive Atmospheres-Part 10-1: Classification of Areas-Explosive Gas Atmospheres", 2015.
  2. KS C IEC 60079-10-2, "Explosive Atmospheres-Part 10-2: Classification of Areas-Explosive Dust Atmospheres", 2014.
  3. IEC 60079-10-1, "Explosive Atmospheres-Part 10-1: Classification of Areas-Explosive Gas Atmospheres", 2015.
  4. IEC 60079-10-2, "Explosive Atmospheres-Part 10-2: Classification of Areas-Explosive Dust Atmospheres", 2015.
  5. NFPA 497, "Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas", 2017.
  6. NFPA 499, "Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas", 2017.
  7. API RP 500, "Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2", 2012.
  8. API RP 505, "Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone 1, and Zone 2", 1997.
  9. RR630, "Area Classification for Secondary Releases from Low Pressure Natural Gas Systems", Health and Safety Executive(HSE), 2008.
  10. Y. J. Jung and C. J. Lee, "A Study on Gas Explosion Hazardous Ranges for International Electrotechnical Commission Technical Standards", J. Korean Soc. Saf., Vol. 33, No. 3, pp. 39-45, 2018. https://doi.org/10.14346/JKOSOS.2018.33.3.39
  11. J. P. Yim and C. B. Chung, "A study on Classification of Explosion Hazardous using Lighter Than Air Gases", J. Korean Soc. Saf., Vol. 29, No. 2, pp. 24-30, 2014. https://doi.org/10.14346/JKOSOS.2014.29.2.024