Mumbai Coastal Road to have Saccardo nozzles for high ventilation and airflow | Mumbai News – Times of India

MUMBAI: The BMC will install Saccardo nozzles also known as Saccardo ejectors or impulse nozzles inside the tunnels of the Coastal Road to improve ventilation and air flow.
BMC officials said that the coastal road has two 2.07 km tunnels and these high end Saccardo nozzles will be installed in both the tunnels. Saccardo nozzles supply external air into a tunnel by fans situated in a fan chamber outside the tunnel, officials said.
According to officials, Saccardo nozzles introduce an air jet into a tunnel, at a high velocity. This air jet imparts most of its momentum to the tunnel air, and hence helps to drive the tunnel air in a particular direction.
Saccardo nozzles supply external air into a tunnel by fans situated in a fan chamber outside the tunnel
“In particular, this system will be installed in road transport tunnels for the first time in the country. The system consists of typical fans with a diameter of 2 m each and a total of 6 fans for both the tunnels with 3 for each tunnel. For this, special construction will be done inside the tunnels as well as on the top of the tunnels and a ‘Scardo Nozzle’ system will be installed there. This system will be used mainly to keep the air flowing in the tunnels. The system will also help in pushing the smoke coming out of the vehicles passing through the tunnels out of the tunnels, said Suprabha Marathe, Chief Engineer of the coastal road project.
Officials said that a special system connected to the fan will be installed near the mouths of both the tunnels. “The part with the fan in this system will be built in a building on top of the tunnel. The fans will be able to rotate at a high speed of 1800 rounds per minute. There will be 3 fans for each tunnel and 6 fans for both tunnels. However, two fans in a tunnel will be on at the same time, and all three fans will be working in sequence. The Saccardo Nozzle has a lifespan of 50 years and will not be affected by fire,” officials explained.
“Also, if the vehicle catches fire in an unfortunate event, the smoke generated from it will also be pushed outwards by this system. This will prevent smoke from accumulating in the tunnel and make it easier to plan for emergencies. With this in mind, this Saccardo nozzle system will be complementary to the fire fighting system and emergency management system,” the officials added.
The Coastal Road project consists of a tunnel, a road, and an interchange. The road will connect South Mumbai to the Bandra-Worli Sea Link’s (BWSL) Worli end.
The BMC is targeting completion of the 10-km coastal road project between Nariman Point and Worli by December 2022 despite a five-month disruption last year. The Rs12,721-crore project was originally to be completed in four years since commencement of work in October 2018.

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