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M&E systems for Route 9, Hong Kong, China 

COWI has provided specialist assistance to Ove Arup & Partners Hong Kong Ltd. with the design of electrical and mechanical systems for a section of the Route 9 urban motorway. The section includes the Nam Wan tunnel and two adjoining viaducts.

The Nam Wan tunnel is a 1.25 km long 3-lane highway tunnel. It has two separate tubes, 12 cross passages, and a portal building at each end

In the preliminary design phase COWI established an overall concept for the electrical and mechanical systems with emphasis on safety-related functions such as electric power supply, tunnel lighting, fire fighting, tunnel ventilation and smoke extraction. This overall concept was used as a basis for the Client’s detailed design.

Later in the project COWI reviewed the Client’s detailed design of electrical and mechanical systems.

The electrical and mechanical systems include the following:

  • High and low voltage distribution (11kV/0.4kV)
  • Reliable power supply based on UPS and diesel generators
  • Tunnel lighting and road lighting
  • Lighting in portal buildings, technical rooms and cross passages between tunnels
  • Central Monitoring and Control System (CMCS)
  • Fire detection system
  • Public mobile communication system
  • Fire fighting equipment, including fire water booster pumps, hydrants and portable extinguishers
  • Tunnel ventilation for normal operation, congested operation and emergency situations (smoke control)
  • Smoke extraction system
  • Pressurized air supply
  • HVAC and plumbing in portal buildings.