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KMID : 0895420070170030212
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Journal of Korean Society of Occupational and Enviromental Hygiene
2007 Volume.17 No. 3 p.212 ~ p.223
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The Status of Maintenance of Exhaust Fans and Bag filters in Melting Processes in a foundry industrial complex
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Kim Tae-Hyeung
Ha Hyun-Chul
Jeoung Chun-Hwa
Seo Jeoung-Yoon
Piao Cheng-Xu
Yang Jun-Ho
Li Xiaoyu
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Abstract
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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.
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KEYWORD
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Exhaust fan, Bag filter, Melting process, initial test, Self inspection
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