Abstract
Abstract. Several sulfur hexafluoride (SF6) tracer gas experiments were conducted in a subway system to measure the possible pathways of toxic gas for subway tunnels and stations empirically. A new mobile integrated measuring and analysis system was used to achieve high sample rates and a long measurement time. Due to the mobility of the sensors, tracer gas experiments were also carried out inside running subway coaches. All experiments showed a common pattern: the pathways of tracer gas dispersion overlapped with some escape routes, which were contaminated within a few minutes. So in case of catastrophic circumstances like terrorist attacks or subway fires, some escape routes will become deathly traps, but the results also showed free escape routes. With the new sensor technique it will be possible to conduct safety assessments for escape routes in underground transportation facilities.
Highlights
Introduction and motivationThe results of tracer gas experiments help to understand the possible spread of toxic airborne substances for example in subway stations, which are vulnerable in the face of terrorism
In case of catastrophic circumstances like terrorist attacks or subway fires, some escape routes will become deathly traps, but the results showed free escape routes
This method, has some disadvantages: the number of syringes is limited to the laboratory capacity, which results in a short measurement time and a low sample rate
Summary
The results of tracer gas experiments help to understand the possible spread of toxic airborne substances for example in subway stations, which are vulnerable in the face of terrorism. As preventing terrorists from entering subway stations is very difficult, preparedness and response are very important. This includes the pathways of airborne toxic substances in subway stations needing to be known and not overlap with emergency escape routes. The contamination of air with SF6 was often determined by manual air probes with a 60 mL syringe sand subsequent analysis with a gas chromatograph. This method, has some disadvantages: the number of syringes is limited to the laboratory capacity, which results in a short measurement time and a low sample rate. The development of a mobile battery powered integrated measuring and analysis system for SF6 recording with a sample rate of 2 s solves these problems
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
