tmall 0141 presentation v 1.0 a concept for simplified fixed fire fighting system: northern link,...
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A concept for simplified Fixed Fire Fighting System:Northern link, Stockholm
Ulf Lundstrm, TSOSwedish Transport AdministrationTMALL 0141 Presentation v 1.0
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Northern Link:
Part of ring road project
3,5 km long, in all 15 km of tunnels#
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Basic fire safety concept:Free flow traffic#
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Fresh air#
2004:Southern Link opens for traffic:100 000 vehicles /day, estimated 60 000.= Slow traffic
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2004-2012:The tunnel closing when cogestion occurs.#2009 The safety concept of the Northen Link is uppdated in four aspects:
Improved detection
Improved traffic controll and management
Improved message handling to users
Fixed Fire Fighting System#Fixed Fire Fighting System in the Northern Link:
Safety, not asset protection
No traditional tunnel sprinkler
Focus on cost effectivenes, robustnes and mantainability
#Design solutions:
Long sections (75 m)
Low pressure, large droplets
Extended coverage nozzles
City water supply, no pumps
Remtotely operated membrane valves
Starts automatically at 90 C in heatdetection cable
Protected against corrosion and freezing
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FFFS in the project Northern link##Inner diameterSideways-distributing T-rex sprinkler nozzles with a c-c of 5 m. Made by Tyco 15#Inner diameterSideways-distributing T-rex sprinkler nozzles with a c-c of 5 m. Made by Tyco 16#Inner diameterSideways-distributing T-rex sprinkler nozzles with a c-c of 5 m. Made by Tyco 17
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#General data:
Number of sections: 230Total length: ca 15 kmInvestment cost: 72 Msek (7 M)Investment cost per km: 5 Msek (0,5 M)
Experiences since nov 2014:
No firesNo false activations100% availability100% reliability (test once a year)No service or repairs required
#Tests conducted in cooperation with SP
Water distribution tests at different air speeds Visibility in a activated section Visibility from a moving car in a activated section Test of evacuation by foot through a activated section Fire tests: risk of fire spread between vehicles, 6 MW propan flame Activation in winter conditions (- 6 grader C)
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