An Experimental Study on the Improvement of Foam Fire-Extinguishing System's Mixing Ratios by Expanding the Cross Sectional Area of the Stock Solution Inhaling Piping

Ki-Jo, Yun; Kyung-Nam, Jang; Eun-Sun, Baek; Bong-Rae, Park; Hee-Joog, Park

doi:2013.27.3.30

Fire Sci. Eng. > Volume 27(3); 2013 > Article

Journal of Korean Institute of Fire Science and Engineering 2013;27(3):30-37.
DOI: https://doi.org/10.7731/KIFSE.2013.27.3.030 Published online June 30, 2013.

원액흡입배관 단면적 확장에 의한 포 소화설비 혼합비 개선에 관한 실험적 연구

윤기조, 장경남, 백은선, 박봉래, 박희중

¹동신대학교 대학원 소방학과
²동신대학교 대학원 소방학과
³동신대학교 소방행정학과
⁴미르엔지니어링(주)
⁵신라파이어(주)

An Experimental Study on the Improvement of Foam Fire-Extinguishing System's Mixing Ratios by Expanding the Cross Sectional Area of the Stock Solution Inhaling Piping

Yun Ki-Jo, Jang Kyung-Nam, Baek Eun-Sun, Park Bong-Rae, Park Hee-Joog

¹Graduate School of Fire Department, Dong-shin Univ.
²Graduate School of Fire Department, Dong-shin Univ.
³Depart. of Fire Administration, Dong-shin Univ.
⁴Mir Engineering, Co., Ltd.
⁵Shilla Fire, Co., Ltd.

요약

본 연구는 가연성탱크 화재발생시 하나의 포 비례혼합기에서 분기헤더를 거쳐 다수의 소화지역 분기방식 포 소화설비의 분기헤더에서 저장탱크 하단부 입상관 까지의 포수용액 배관단면적 감소에 따른 통과유량 감소로 혼합비가 허용범위를 벗어날 때 적정농도의 포수용액 방출에 효과적인 방법을 확보하는데 궁극적인 목적이 있다. 이를 위해 기설치 포 소화설비의 유량변동에 따른 혼합비 변동원인 분석 및 일정혼합비 보상방법을 찾아보고, 포 비례혼합기 벤츄리 폼챔버 오리피스 및 미터링 오리피스 교체실험을 통해 원액흡입배관 단면적을 확장시킬 수 있는 미터링 오리피스 교체실험이 포 소화설비 혼합비 개선에 가장 효과적인 방안임을 입증하였다.

Abstract

The ultimate purpose of the present study is to secure a effective method for foam liquid discharge when the mixing ratio deviates from the permissible range due to a decrease in the bypass flow rate resulting from a decrease in the cross sectional area of the foam liquid piping ranging from the branching header of one foam proportioner to the branching headers of multiple branching foam fire-extinguishing systems in the region for fire extinguishing and then to the standpipe at the lower part of the storage tank when a fire occurred in a combustible tank. To this end, the cause of mixing ratio variations following changes in the flow rates of existing foam fire extinguishing systems was analyzed, methods for compensation for constant mixing ratios were investigated, and it was proved that metering orifice replacements that could expand the cross sectional area of the stock solution inhaling piping was the most effective way for the improvement of form fire extinguishing systems' mixing ratios through foam proportioner venturi, foam chamber orifice, and metering orifice replacement experiments.

Key Words: Foam proportioner, Mixing ratio, Metering orifice