Analysis of the Fineness Change Test of Type-3 Dry Chemical Powder with the Changes in Internal Pressure of Dry Chemical Extinguisher

Abstract

This study aims to analyze the fineness variance, one of the fire extinguisher's physical properties experiments, to confirm the maintaining state for fire extinguishing performance with changes in the internal pressure of the dry chemical extinguisher and the use periods, which were not covered in previous studies. The analysis results in fineness variance to examine the fire extinguisher's performance showed a difference in fineness variance with the change in internal pressure, whereas there was no difference in fineness variance with use periods. However, why sample 09-6-new in the recycled dry chemical powder with 13 elapsed years was found inappropriate was considered to result from poor maintenance, such as external environment and management status. So, it showed that fire extinguishers' maintenance proved an essential factor. Accordingly, it was suggested a need for practical training of fire safety managers and improving fire extinguisher inspection methods.