fire life safety for an underground wye junction...fire life safety for an underground wye junction...
TRANSCRIPT
![Page 1: Fire Life Safety for an Underground Wye Junction...Fire Life Safety for an Underground Wye Junction Ian Ong, PE Vice President and Deputy Practice Leader Mott MacDonald And Thomas](https://reader034.vdocument.in/reader034/viewer/2022042202/5ea37fda00056b3dfc06cb1e/html5/thumbnails/1.jpg)
Fire Life Safety for an Underground Wye Junction
Ian Ong, PEVice President and Deputy Practice LeaderMott MacDonald
And
Thomas EngSenior Director, Corporate SafetyLos Angeles County Metropolitan Transportation Authority (Metro)
ThoCity, State/Province
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Challenges associated with Underground Wye Junctions
• Why are Wyes Challenging for FLS?• Location where multiple trains can stop during normal
operations• FLS Design criteria and standard practices less prevalent
unlike for an underground station, tunnels and crossovers• Emergency egress is a challenge, multiple paths of egress
to manage• Push-pull ventilation scheme may not be appropriate• No firewall separation
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Current status of criteria in addressing Complex Wye junctions
• Los Angeles Metro criteria
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Overview of Regional Connector
• Critical link for downtown Los Angeles
Alameda Wye
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Overview of Regional Connector
• Everything is underground!!! Junctions
• Point 2
• Point 3
• Point 4
• Point 5 or more
• And just six lines per page.
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1st Central Station and Alameda Wye Design Drawings
1st/Central (West) 1st/Central (East)
Alameda Wye
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Alameda Wye Mechanical Drawings
• Point 3
• Point 4
• Point 5 or more
• And just six lines per page.
Tunnel Ventilation Fans
Tunnel Ventilation Fans
Track/Tunnel Dampers
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Analysis
• Computational Fluid Dynamics• CCM+ multi-physics software, fully validated
• Steady/Transient
• Smoke model
• Fire Scenario• Single train car fire (fire inside car)
• 19.84 MW medium fire growth
• Beneficial effect of sprinklers not included
• Pass/Fail Criteria • Provision of a tenable environment during egress
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Train locations for analysisEvolution of events
1st Central Station
Incident train- middle car fire (just left 1st Central)
Train waiting at stop signal
Train dwelling at station
Leading to portal
1st Street portal
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Alameda Wye JunctionFire Scenario
1st Street leg towards East LA
Alameda leg towards Union Station
1st Central Station
Track/Tunnel Dampers
Tunnel Ventilation Fans
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Proposed Ventilation for Mode 1
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Results for Mode 1
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Results for Mode 1
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Results for Mode 1 (with one fan out)
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Results for Mode 1 (with one fan out)
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Proposed Ventilation for Mode 2 (final recommendation)
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Results for Mode 2
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Results for Mode 2
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Proposed Ventilation for Mode 2 – one fan out
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Results for Mode 2 (one fan out)
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Results for Mode 2 (one fan out)
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Mode Table Implementation
All fans available
One fan out
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Mode Recommendations
• While Mode 1 provides better visibility in the Wye, the damper control is highly based on the fire location.
• The operator in the ROC needs to know which tunnel the fire is to determine the ventilation mode, which will increase the ventilation response time.
• Mode 2 also contains the smoke within the Wye and the single response irrespective of the exact fire location can reduce the response time. (Consideration to activate west fans)
• Therefore Mode 2 is recommended as it is ‘less’ location dependent
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Additional Enhanced FLS provisions
• Enhanced egress
• Fire Suppression System
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Enhanced Egress
Section of Egress Stairwell
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Wye Fire Suppression System
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Final Recommendations
• CFD showed that Mode 1 is more effective even though Mode 2 is acceptable… many modes can address a particular event… for simplicity there is only one mode
• Ventilation principle is based on ‘containment’
• Egress direction is to move out of the incident ventilation zone.. To egress exits or station or portal
• Safety is enhanced with the installation of Fire Suppression (Sprinklers) owing to complexities associated with egress
• Control system flexibility required to start supplemental ventilation mode in the case of critical fan failure during an incident
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Thank you