An evaluation of a perfluoromethylcyclohexane （PMCH） permeation plug release vessel （PPRV） in a controlled turbulent environment

The use of sulfur hexafluoride(SF6)as a tracer gas for analyzing underground mine ventilation systems has been practiced for over 30 years.As a result,the methods used to release,sample,and analyze SF6are well accepted.As the complexity and size of underground mine ventilation networks increase,the ability of a SF6to function as a convenient and rapid means of analysis diminishes.The utilization of multiple tracer gases can mitigate this by removing the need to purge the background presence of a tracer before conducting another release and allowing for a more comprehensive evaluation using multi-zone techniques.Recent studies have identified perfluoromethylcyclohexane(PMCH)as a possible supplement for SF6in underground mine ventilation tracer studies.However,the deployment of PMCH remains a challenge because of this compounds physical properties.This paper evaluates a PMCH permeation plug release vessel(PPRV)under controlled turbulent conditions.The details of the experimental parameters used in the evaluation as well as a discussion regarding the performance of the PPRV are included.