Central-Wan Chai Bypass Tunnel air purifier broke Emergency monitoring

Central- Wan Chai Bypass is a 4.5-kilometer highway, including a 3.7-km tunnel, took nearly nine years to complete at a total cost of HK$36 billion. On the date, April 9, 2019, some ventilation fan components of the Air Purification System (APS) at the East Ventilation Building (EVB) of the Central - Wan Chai Bypass and Island Eastern Corridor Link (CWB) were damaged. The operation of the APS at the EVB has been temporarily suspended. 

There are three APS facilities for the CWB tunnel located in the EVB, the Middle Ventilation Building (MVB) and the West Ventilation Building (WVB) for purification of the tunnel exhaust before discharge via the ventilation buildings.

Since the operation of the APS at the EVB is currently suspended, the HyD, in addition to the in-tunnel air quality monitoring, has requested its consultant ACOME to monitor the air quality outside the eastern portal and in the vicinity. AECOM uses the MAS-AF300 rapid networking, efficient and accurate features to provide real-time online monitoring data for the air quality in and around the Wan Chai bypass tunnel to ensure the tunnel environment and provide relevant emergency solutions. The air quality monitoring results show no abnormalities in the recent air quality within the tunnel and in the vicinity of the eastern portal.

 The other two sets of APS facilities at the WVB and the MVB, as well as the tunnel smoke extraction and ventilation system, are operating normally. As such, the incident does not affect the air quality inside the CWB tunnel