In the industrial field, various type of fuel have been used for product processing facilities. Recent for 10 years, the usage of natural gas (NG) was gradually increased. Because it has many merits; clean fuel, no transportation, storage facility and so on. There are common safety concept that strict explosion protection approaches are needed for facilities where explosive materials such as flammable liquid, vapor and gases exist. But some has an optimistic point of view that the lighter than air gases such as NG disperse rapidly, hence do not form explosion environment upon release into the atmosphere, many parts has a conventional safety point of view that those gases are also inflammable gases, hence can form explosion environment although the extent is limited and present. In this paper, the heating equipments (Hot Oil Heater) was reviewed and some risk management measures were proposed. These measures include hazardous area classification and explosion-proof provisions of electric apparatus, an early gas leak detection and isolation, ventilation system reliability, emergency response plan and training and so on. This study calculates Hazardous Area Classification using the hypothetical volume in the KS C IEC code.

Abstract
 1. 서 론
 2. 폭발위험장소 구분
  2.1 폭발위험장소 구분 대상
  2.2 누출공의 면적 등 기본 정보 적용 근거
 3. 폭발위험장소 구분 비교 검토
  3.1 API 기준에 의한 폭발위험장소 구분
  3.2 NFPA 기준에 의한 폭발위험장소 구분
  3.3 API 및 NFPA 기준에 의한 폭발위험장소 구분에 대한 고찰
 4. 폭발 예방 위험관리 방안
  4.1 누출 시 대비 점화원 (방폭 기기) 관리
  4.2 누출 조기 감지 및 누출 지속 차단
  4.3 환기 시스템 신뢰도 유지
  4.4 비상 시 대비 및 대응
  4.5 공정 방폭구분 관련 개정 기준 적용
 5. 결론 및 고찰
 6. References

• 장철(인천대학교 안전공학과) | Chul Jang
• 권진욱(인천대학교 안전공학과) | Jin-Wook Kwon
• 황명환(인천대학교 안전공학과) | Myoung-Hwan Hwang Corresponding Author