Tunnel & Metro

Since the 1970s WITT has supplied fans for national and international tunnels, metro and wind tunnel projects. This includes very large axial fans for ventilation control centres and wind tunnels as well as jet fans for longitudinal ventilation. WITT was one of the first fan manufacturers which was able to offer smoke extraction axial fans up to 700°C,1h.

 

The complete product range of us is certified for temperature classes F400, F300 and F200 according to EN12101-3. The development of the Banana Jet ® at the end of the 1990s has led to a small revolution in the longitudinal ventilation, as huge cost savings can be achieved by the use of these jet fans.

 

It is particularly noteworthy that all fans "full size" are measured at our test facility: All jet fans (30-3000N) are measured on test benches according to ISO 13350, axial and centrifugal fans (up to 1.000.000m ³ / h and 20.000Pa) according to ISO 5801. The test benches were designed partly together with the University of Karlsruhe and are of course AMCA certified.

Some individual industries

  • Road Tunnel (longitudinal ventilation / exhaust centers)
  • Metro (longitudinal ventilation / exhaust centers)
  • Railway tunnel (longitudinal ventilation / exhaust centers)
  • Wind Tunnel (main and auxiliary fan)

References: 800 tunnels in total

Some projects in tunneling

  • Renovation Elbtunnel Tubes 1-3
  • Tunnel Chain S10 in Austria
  • Renovation RATP Paris
  • Mexico City- Line 12
  • Nörra Länken in Stockholm
  • Delhi Metro Line 3
  • North Connex, Sydney
  • Leopold 2, Brussels
  • Banana Jet® fan from the movie "Mission Impossible - Rogue Nation", Ascot Racecourse/England

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Individual products in tunnel

Jet fans

  • Mounting Frame
  • Silencer
  • Anchor Bolts
  • Assembly
  • Softstart/Frequency Converters
  • Sensors/probes of all kinds

Banana Jet®

Axial fans

  • Fan frame
  • Splitter-type Silencer
  • Silencer
  • Diffusor
  • Measuring Cabinet
  • Butterfly Damper
  • Fire Damper
  • Auxiliary Fan
  • Backdraft Damper
  • Partition Wall
  • Assembly
  • Frequency Converter
  • Sensors/probes of all kinds

Frequently Asked Questions about Tunnel & Metro

How does tunnel ventilation work?

Tunnel ventilation provides controlled air exchange, reliably removing pollutants, heat, exhaust gases and, in the event of fire, smoke from the tunnel.

 

Why are smoke extraction systems necessary in tunnels?

In the event of fire, smoke extraction systems direct smoke away in a targeted way, allow fresh air to flow in, and thereby support safe evacuation and rescue operations.

 

Which fans are used in road tunnels?

Road tunnels frequently use jet fans for ventilation and smoke extraction. Depending on tunnel geometry, ventilation concept and safety requirements, they are supplemented by axial fans for fresh air supply or for extracting hot smoke gases.

 

What solutions are available for metro tunnels?

Individually designed ventilation and smoke extraction systems are developed for metro tunnels to support safe operation.

 

Which standards apply to tunnel ventilation and smoke extraction?

National and international standards and safety guidelines apply depending on the project. Directive 2004/54/EC applies to road tunnels longer than 500 metres in the Trans-European Road Network. In Germany, additional national regulations must be considered; for US or comparably specified international projects, NFPA 502 may also be relevant.

 

How is airflow controlled in a tunnel?

Sensors measure air quality and airflow. The data is transmitted to a central control system (SCADA); the system control operates the fans as needed, depending on traffic volume or in an emergency.

 

Further Information

Learn more about our industry solutions, discover our reference projects in tunnel and metro construction, or find out about our Banana Jet®.