하동명

Vol. 33,  No. 4, pp. 8-14, Aug.  2018
10.14346/JKOSOS.2018.33.4.8

Photovoltaic electrical fire IGBT discharge resistance PCS FMEA(Failure modes and effects analysis)

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In the industrial chemical process involving combustible materials, reliable safety data are required for design prevention, protection and mitigation measures. The accurate combustion properties are necessary to safely treatment, transportation and handling of flammable substances. The combustion parameters necessary for process safety are lower flash point, upper flash point, fire point, lower explosion limit(LEL), upper explosion limit(UEL)and autoignition temperature(AIT) etc.. However, the combustion properties suggested in the Material Safety Data Sheet (MSDS) are presented differently according to the literatures. In the chemical industries, tetralin which is widely used as a raw material of intermediate products, coating substances and rubber chemicals was selected. For safe handling of tetralin, the lower and flash point, the fire point, and the AIT were measured. The LEL and UEL of tetralin were calculated using the lower and upper flash point obtained in the experiment. The flash points of tetralin by using the Setaflash and Pensky-Martens closed-cup testers measured 70℃ and 76℃, respectively. The flash points of tetralin using the Tag and Cleveland open cup testers are measured 78℃ and 81℃, respectively. The AIT of the measured tetralin by the ASTM E659 apparatus was measured at 380℃. The LEL and UEL of tetralin measured by Setaflash closed-cup tester at 70℃ and 109℃ were calculated to be 1.02 vol% and 5.03 vol%, respectively. In this study, it was possible to predict the LEL and the UEL by using the lower and upper flash point of tetralin measured by Setasflash closed-cup tester. A new prediction method for the ignition delay time by the ignition temperature has been developed. It is possible to predict the ignition delay time at different ignition temperatures by the proposed model.