This study’s goals are to conduct hazard exposures survey for operation of manual feeding chemicals into tanks and to provide recommendations of the assessment and improvement of feeding control measures, and further to solve the problem of powder and tank chemical vapor or gases escaping to the job site during feeding in the resin manufacturing industry. Also, the study aims at providing protection of workers’ health rights.
The results of the VOC samples show that the 8-hr TWA exposure concentrations of all 18 VOCs were less than one-tenth of their corresponding permissible exposure limits; the measured 8-hr TWA exposure concentrations of both total and respirable dusts were also less than one-tenth of their corresponding permissible exposure limits. Through CFD (Computational Fluid Dynamics) simulation, a ring-shaped side-drawing local exhaust device suitable for manual material feeding of chemical tanks was developed. The on-site test was performed after the ventilation system was manufactured, and the result was similar to CFD simulation.
Simulation results of 10 μm dust capture with 20 m/s of a wind speed for a duct (the wind speed at the center of the feed port was 0.38 m/s).
- News From：Division of Occupational Hazards Assessment
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