EVALUATION OF THE UN VENT SIZING METHOD FOR ORGANIC PEROXIDE PORTABLE TANKS

摘要

Type F organic peroxides are permitted for transport in portable tanks. Emergency Relief Systems have to be fitted to tanks intended for the transport of such peroxides. The United Nations Manual of Tests and Criteria includes a method to determine the minimum required emergency vent area using a 10 dm~3 test apparatus. The 10 dm~3 test apparatus is electrically heated (to simulate a fire) and the vent area is then scaled-up on vessel volume. The Design Institute for Emergency Relief Systems (DIERS) has also produced methods to size the vents for gas generating runaway reaction systems including the decomposition of organic peroxides. These methods make use adiabatic calorimeters and vent sizing equations that consider if the vent will have to pass a two-phase gas-liquid flow or a single-phase gas-only flow. The UN vent sizing method is evaluated and large-scale trials on organic peroxide decomposition described. DIERS vent-sizing calculations for two-phase homogeneous flow and gas-only flow are compared with the large scale test results.