DUST EXPLOSION RISK ASSESSMENT IN THE STORAGE BIN OF MICROCRYSTALLINE CELLULOSE BY FAULT TREE ANALYSIS

Abstract

A dust explosion in food ingredients production process can cause catastrophic loss of life, injuries, and destruction of buildings. This research aimed to assess dust explosion risk assessment in the storage bin of micro crystalline cellulose by fault tree analysis (FTA). To identify dust explosion possible cause by system failure such as machine, equipment, process control and administrative control failure. The FTA result showed 29 scenarios hazard identified which has impact on occupational health community, Environment, and property. The risk assessment process was identified 2 unacceptable risk that come from 2 scenarios possible root cause from the ignition source of the hot work performing without the isolation or the work performing not follow the hot work permit system. FTA with probability and reliability assigned of this event is 0.7657 and reliability is 0.2343. The study result of the dust explosion probability of failure on demand reduced from 0.0557 to 0.0236 and reliability increase from 0.9443 to 0.9764. The risk reduction credit come from the dust explosion hierarchy control measure implemented such as inherent safer process designed, engineering and administrative controls. This include isolation vales to prevent fire propagation to next process, fire suppression system to prevent fire propagation, bounding/grounding to prevent electrostatic discharge, explosion proof electrical area classification compliance, explosion venting to release deflagration pressure to safe location. Including employees training, housekeeping/dust removing.