Case story | SEM-SAFE® high-pressure water mist system in Indian road tunnel Danfoss SEM-SAFE® provides efficient, safe, and sustainable fire protection for Samruddhi expressway tunnel in Maharashtra, India First road tunnel with water mist system in India Danfoss Fire Safety A/S An expressway to socio-economic growth The 6-lane Nagpur Mumbai Super Communication Expressway helps connect the cities of Mumbai and Nagpur and will contribute to overall socio-economic growth in the state of Maharashtra, India. Towards the western end of the road, the 7.7-kilometre 3-lane Samruddhi tunnel enables road users to safely cross the Western Ghats mountains in less than 10 minutes. Danfoss solution contributes to safety Safety is of paramount importance in road tunnels. Fires can develop very quickly, and catastrophes like the 1999 Mont Blanc tunnel fire underscore the importance of ensuring efficient and reliable fire protection. To protect road users, the Samruddhi tunnel has 26 cross- passages allowing people to escape. 54 fans in each tube ensure proper ventilation and clear away smoke. And the tunnel is the first in India to be protected by a water mist system – a SEM-SAFE® high-pressure water mist system from Danfoss Fire Safety. Efficient fire suppression for tunnels High-pressure water mist is becoming widespread in tunnel applications, and for good reasons. The SOLIT² Research Consortium has tested the technology in road tunnels, and results indicate that the technology efficiently suppresses even deep-seated fires. It slows fire growth, limits heat release, eliminates smoke backlayering, and reduces temperatures by blocking heat radiation. The technology works by releasing a water mist that simultaneously lowers the temperature and removes oxygen. The SEM-SAFE® solution in the Samruddhi tunnel covers both tubes of the tunnel with open stainless-steel nozzles connected by 4-inch water pipes divided into sections using section valves. In case of a fire, the Danfoss pumps start up and rapidly provide water for the affected areas through the section valves. The water is forced through nozzles at high-pressure to create a fine mist. The system has two pumping stations: one at each end of the tunnel. This provides redundancy in case one pump room is temporarily out of order, and it reduces piping inside the tunnel. High-pressure water mist is a completely safe fire technology for people. www.semsafe.danfoss.com
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