Planning and Design for Fire and Smoke Incidents in Underground Passenger Rail Systems (2017) / Chapter Skim
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Pages 19-30
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19 IntroductIon This is the first of two chapters presenting the results of a survey of transit agencies regarding planning and design for fire and smoke incidents in underground passenger rail systems. The survey was designed to elicit information on: 1.
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20 One agency noted that it uses NFPA 130 on all new projects but some parts of its system predate the standard. Table 5 shows how agencies use NFPA 130.
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21 IncIdentS and cauSeS Minor underground fire and smoke incidents are not uncommon, but major incidents occur less often. The survey defined a "major" incident as causing a service disruption of 2 h or more.
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22 Table 9 shows the primary causes of underground fire and smoke incidents. This was a multiple choice question with multiple responses accepted.
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23 Most respondents (24 of 26; 92%) report that their agency does not have a fire suppression system onboard transit vehicles that operate in tunnels.
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24 ventilation to produce an evacuation path free of smoke and a maintenance mode to remove by-products of combustion from maintenance vehicles during nonrevenue hours. Table 13 indicates that ventilation fans typically are controlled remotely.
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25 A final set of questions in this section asked about if and how agencies change their protocols and procedures as new techniques and regulations emerge, if there are "triggers" to retrofit the system, and if there are work-arounds for legacy systems to meet new requirements. Table 15 indicates that agencies take several different approaches.
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26 entering the affected area. If the incident is deemed serious enough, passengers will be evacuated.
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27 Most agencies (16 of 24; 67%) are not aware of recent full-scale tests in which fire size was measured at 52 to 72 Mw in existing vehicles (roughly four times larger than most systems are designed to handle)
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28 A follow-up question revealed additional elements of agencies' training programs. Ten agencies responded.
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29 As noted, many agencies rely on NIMS and its Incident Command System (ICS) to establish a chain of command in the field when responding to fire and smoke incidents.
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30 are the most common elements. More than two-thirds of respondents report that their agency has adopted design standards or codes related to underground fire and smoke prevention and detection.
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