Corrosive treatment blows repair engineers away

09 April 2008
 
As part of work to address corrosion in the main suspension cables of the Severn Bridge, an initial phase dehumidification system has been installed on the centre spans of the main cable.

The system is the first operational main cable dehumidification system to be implemented on a major suspension bridge in the UK. It works by blowing dry air into the cable to reduce humidity, dry out the wires inside, and slow down the rate of corrosion.

The system is part of the Highways Agency’s £20M project to preserve the future of the bridge. Work to install the full system to the rest of the main cables has started, and should be completed by the beginning of 2009. Monitoring will continue and further detailed cable inspections are planned for 2010.

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