Journal of Korean Society of Occupational and Environmental Hygiene (한국산업보건학회지)

Korean Industrial Hygiene Association (한국산업보건학회)
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The Status of Maintenance of Exhaust Fans and Bag filters in Melting Processes in a foundry industrial complex

주물 공단 용해공정의 송풍기 및 백필터 관리 실태

  • Kim, Tae Hyeung (Department of Environmental Engineering, Changwon National University) ;
  • Ha, Hyun Chul (VENTECH Corp.) ;
  • Jeoung, Chun Hwa (Department of Health and Safety Engineering, Semyung University) ;
  • Seo, Jeoung Yoon (Department of Environmental Engineering, Changwon National University) ;
  • Piao, Cheng Xu (Department of Environmental Engineering, Changwon National University) ;
  • Yang, Jun Ho (Department of Environmental Engineering, Changwon National University) ;
  • Li, Xiaoyu (Department of Environmental Engineering, Changwon National University)
  • Received : 2007.07.25
  • Accepted : 2007.08.28
  • Published : 2007.09.30
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Abstract

18 Local exhaust ventilation systems in 10 melting companies located in an industrial complex were tested to know the status of maintenance. Test items were fan flowrates, fan static pressures, rotational speeds and differential pressures of bag filters. Only 22% of the tested fans has more than 80% flowrate efficiency. 44% of the fans has lower than 60% efficiency. The performance of the fans are not in a good status. For the fans with lower than 60% efficiency, the analysis shows that the lower flowrate might be caused by the degradation of fan performance. On the other hand, for the fan s with higher than 60% efficiency, the main cause of flowrate reduction might be too much pressure losses due to clogging of filter bags. The degradation of fans usually lead the reduction of hood capture efficiency, resulting in the increase of contaminant concentrations in workplace. To keep fans in good status, self inspections should be periodically conducted. This inspection should include the measurements of flowrate and pressures. The most important thing to be performed is the initial test of local exhaust ventilation system because the initial test data should be used to know the level of system degradation.

Keywords

Acknowledgement

Supported by : 창원대학교

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